R-1 — لوائح التركيبات الكهربائية
15 الملاحق والجداول والرموز
الصفحة 51 في الوثيقة الأصلية
عرض PDFعرض الجداول المرجعية المنظمة (سعات التيار، التصحيح، التأريض)
SECTION 15
APPENDICES, TABLES, GRAPHIC SYMBOLS
NOTES - 1. Various appendices, tables, graphic symbols, etc. are a provided in this Section. These are
to be construed as a part of the Regulations and shall be complied with .
2. Where for a particular condition of installation, the appendices, tables, etc. do not apply,
then MEW's prior approval shall be obtained for the method adopted.
APPENDIX 1
Co-ordination between conductor size and excess current protection device employed.
General Condition:
For compliance with Clause No. 750-17 of the Regulation the following conditions are to be fulfilled:
(i) The excess current protection device's nominal current or current setting (In) is not less than the design
current (IB) of the circuit, and
(ii) its nominal current or current setting does not exceed the lowest current carrying capacity (IZ) of any
of the conductors of the circuit, and
(iii) the current causing effective operation of the protective device (I2)) does not exceed 1.45 times the lowest
of the current carrying capacities (IZ) of any of the conductor of the circuit.
The above condition may be stated as formulas:
IB ≤ In ≤ IZ
I2 ≤ 1.45 IZ
In order to determine the size of the cable to be used for a particular condition of installation, it may be necessary
to apply one or more of the following correction factors:
( i) For ambient temperature - Table 2.5A of Section 15 which gives correction factor to be applied for the actual
ambient temperature of the installation when it exceeds 30°C.
(ii) For grouping - Tables 2.2, 2.3 and 2.4 of Section 15 which gives correction factors for various grouping of
circuits.
Determination of Size of Cable to be used:
Having established the designed cur rent of the circuit under consideration and having chosen the type and nominal
current or current setting of the excess current protective device it is intended to use in accordance with general
condition above, the following procedure shall be adopted to determine the size of cable:
( i) DIVIDE the nominal current of the excess current device by the appropriate ambient temperature correction
factor given in Table 2.5A for the type of cable to be used.
51
(ii) Then further, DIVIDE by any applicable correction factor for grouping given in Tables 2.2, 2.3 and
2.4.
(iii) The size of the cable to be used shall be such that its tabulated current carrying capacity for the installation
method concerned is not less than the value of the nominal current of the excess current protective device
adjusted as above.
Example:
(a) A circuit feeding a balanced three phase load of 21 KW at 0.8 P.F., 415 volts, at an ambient temperature
of 50°C by means of single core, PVC insulated cable in conduit along with another circuit.
√
Nominal current of excess current protective device = 40 Amps
2
(b) If the above circuit is run in a separate conduit,
2
(c) A single phase, 240 volts lighting circuit having a load of 2000 VA in an ambient temperature of 45 oC and wired
with single core PVC insulated cable run in a conduit having two more circuits (i.e.,) three circuits together and
protected by 10 amp circuit breaker
Nominal current of excess current protective device = 10 Amps
2
(d) If the above circuit is run in a separate conduit,
2
52
APPENDIX 2
Current Carrying Capacity for Cables
Note -1 : The current carrying capacity under this appendix applies to sheathed and
non-sheathed, and armoured and non-arnoured cables having a nominal
voltage rating not exceeding 1 kV a.c.
Note -2 : The current carrying capacities for cables in air are based upon reference
ambient temperatures of 30oC irrespective of the method of installation.
Note -3 : The current carrying capacities for buried cables, either directly in the soil or
in ducts in the ground, are based upon reference ambient temperatures of
20oC .
Note -4 : For ambient temperatures other than the reference ambient temperature, the
appropriate correction factors as given in Tables 2.5A and 2.5B are to be
applied to the values of current-carrying capacity given in Tables 2.6A to
2. 12.
Note -5 : The current carrying capacities for cables in the ground are based upon a
soil thermal resistivity of 2.5 K.m/W. Correction factors for soil thermal
resistivities other than 2.5 K.m/W are to be applied as given in Table 2.5C.
Note -6 : The current carrying capacities for directly buried cables and cables in
buried ducts are based upon a burial depth of 0.7 metres. Where the depths
of laying are different, correction factors are to be applied as given in Table
2.5D.
Note -7 : The current carrying capacities given in Tables 2.6A to 2.12 apply to single
circuits only. In case of single phase circuits, this consists of two non -
sheathed cables or two single-core cables, or one two-core cable. For 3-phase
circuits, this consists of three non-sheathed cables or three single-core cables,
or one three-core cable. Where more number of cables are installed in the
same group, the correction factors for groups as given in Tables 2.2, 2.3 and
2.4 need to be applied.
53
54
55
TABLE 2.2
Correction factors for group of more than three single-core cables
Type of
Installation
method
Number of Conductors and Correction Factor
4 6 8 10 12 16 20 24 28 32 36 40
1,2,3,4,5,6,8,9 &10 0.80 0.69 0.62 0.59 0.55 0.51 0.48 0.43 0.41 0.39 0.38 0.36
NOTE – In case of one three phase circuit employing 4 wires. no correction factor is applicable and the ratings given in
Table 2.6A to 2.12 shall be adopted. Where more than one three phase circuit is bunched in a conduit or trunking,
then appreciate grouping factor shall be taken into consideration.
TABLE 2.3
Correction factors for group of more than one multi-core armoured and non-armoured cables
Type of
Installation
method
Number of cables and Correction Factor
2 3 4 5 6 8 10 12 14 16 18 20
1,2,3,4,5,6,8,9 &10
0.80 0.70 0.65 0.60 0.57 0.52 0.48 0.45 0.43 0.41 0.39 0.38
NOTE – Where spacing between adjacent cables exceeds twice their overall diameter, no reduction factor need be applied.
TABLE 2.4
Correction factors for group of more than one multi-core armoured
and non-armoured cable buried in ground
Type of Installation method – 7 No. of Cables and Correction factors
2 3 4 5 6
Cable laid touching each other 0.81 0.70 0.63 0.59 0.55
Cables laid 15 cms apart 0.87 0.78 0.74 0.70 0.68
TABLE 2.5A
Correction factors for ambient air temperatures other than 30oC
to be applied to the current carrying capacity shown on various tables
Ambient
temperature oC
Type of Insulation
PVC XLPE
Mineral
PVC covered or bare and
exposed to touch
Bare and not
exposed to touch
45 0.79 0.87 0.78 0.88
50 0.71 0.82 0.67 0.84
55 0.61 0.76 0.57 0.80
60 0.50 0.71 0.45 0.75
56
TABLE 2.5B
Correction factors for ambient ground temperatures other than 20oC
to be applied to the current carrying capacity shown on various tables
Ground temperature oC
Insulation
PVC XLPE
10 1.10 1.07
15 1.05 1.04
20 1.00 1.00
25 0.95 0.96
30 0.89 0.93
35 0.84 0.89
40 0.77 0.85
45 0.71 0.80
50 0.63 0.76
55 0.55 0.71
60 0.45 0.65
TABLE 2.5C
Correction factors for cables buried direct in the ground or in an underground
Cable duct for soil thermal resistivities other than 2.5 K.m/W
to be applied to the current-carrying capacities for Reference Method 7
Thermal resistivity, K.m/W 0.50 0.80 1.00 1.20 1.50 2.00 2.50 3.00
Rating factor for cables in buried ducts 1.28 1.20 1.18 1.13 1.10 1.05 1.00 0.96
Rating factor for direct buried cables 1.88 1.62 1.50 1.40 1.28 1.12 1.00 0.90
TABLE 2.5D
Correction factors for depths of laying other than 0.7 m
for direct buried cables and cables in buried ducts
Depth of laying,
m Buried direct In buried ducts
0.5 1.03 1.02
0.7 1.00 1.00
1 0.97 0.98
1.25 0.95 0.96
1.5 0.94 0.95
1.75 0.93 0.94
2 0.92 0.93
2.5 0.90 0.92
3 0.89 0.91
57
TABLE 2.6A
Single core PVC insulated cables, non-armoured,
with or without sheath
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
1 11 10.5 13.5 12 15.5 14 - - - - -
1.5 14.5 13.5 17.5 15.5 20 18 - - - - -
2.5 20 18 24 21 27 25 - - - - -
4 26 24 32 28 37 33 - - - - -
6 34 31 41 36 47 43 - - - - -
10 46 42 57 50 65 59 - - - - -
16 61 56 76 68 87 79 - - - - -
25 80 73 101 89 114 104 131 114 110 146 130
35 99 89 125 110 141 129 162 143 137 181 162
50 119 108 151 134 182 167 196 174 167 219 197
70 151 136 192 171 234 214 251 225 216 281 254
95 182 164 232 207 284 261 304 275 264 341 311
120 210 188 269 239 300 303 352 321 308 396 362
150 240 216 300 262 381 349 406 372 356 456 419
185 273 245 341 296 436 400 463 427 409 521 480
240 231 286 400 346 515 472 546 507 485 615 569
300 367 328 458 394 594 545 629 587 561 709 659
400 - - 546 467 694 634 754 689 656 852 795
500 - - 626 533 792 723 868 789 749 982 920
630 - - 720 611 904 826 1005 905 855 1138 1070
800 - - - - 1030 943 1086 1020 971 1265 1188
1000 - - - - 1154 1058 1216 1149 1079 1420 1337
58
TABLE 2.6B
Multi-core PVC insulated PVC sheathed cables,
non-armoured,
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
1 11 10 13 11.5 1.5 13.5 17 14.5
1.5 14 13 16.5 15 19.5 17.5 22 18.5
2.5 18.5 17.5 23 20 27 24 30 25
4 25 23 30 27 36 32 40 34
6 32 29 38 34 46 41 51 43
10 43 39 52 46 63 57 70 60
16 57 52 69 62 85 76 94 80
25 75 68 90 80 112 96 119 101
35 92 83 111 99 138 119 148 126
50 110 99 133 118 168 144 180 153
70 139 125 168 149 213 184 232 196
95 167 150 201 179 258 223 282 238
120 192 172 232 206 299 259 328 276
150 219 196 258 225 344 299 379 319
185 248 223 294 255 392 341 434 364
240 291 261 344 297 461 403 514 430
300 334 298 394 339 530 464 593 497
400 - - 470 402 634 557 715 597
59
TABLE 2.6C
Single-core armoured PVC insulated cables (non-magnetic armour)
(COPPER CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 70 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 193 179 205 189 181 229 217 230 212
70 245 225 259 238 231 287 272 286 263
95 296 269 313 285 280 349 332 338 313
120 342 309 360 327 324 401 383 385 357
150 393 352 413 373 373 449 429 436 405
185 447 399 469 422 425 511 489 490 456
240 525 465 550 492 501 593 568 566 528
300 594 515 624 547 567 668 640 616 578
400 687 575 723 618 657 737 707 674 632
500 763 622 805 673 731 810 777 721 676
630 843 669 891 728 809 893 856 771 723
800 919 710 976 777 886 943 905 824 772
1000 975 737 1041 808 945 1008 967 872 816
60
TABLE 2.6D
Multi-core armoured PVC insulated cables
(COPPER CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
1.5 21 18 22 19 22 18
2.5 28 25 31 26 29 24
4 38 33 41 35 37 30
6 49 42 53 45 46 38
10 67 58 72 62 60 50
16 89 77 97 83 78 64
25 118 102 128 110 99 82
35 145 125 157 135 119 98
50 175 151 190 163 140 116
70 222 192 241 207 173 143
95 269 231 291 251 204 169
120 310 267 336 290 231 192
150 356 306 386 332 261 217
185 405 348 439 378 292 243
240 476 409 516 445 336 280
300 547 469 592 510 379 316
400 621 540 683 590 - -
61
TABLE 2.7A
Single core XLPE insulated cables, non-armoured,
with or without sheath
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
1 14 13 17 15 19 17.5 - - - - -
1.5 19 17 23 20 25 23 - - - - -
2.5 26 23 31 28 34 31 - - - - -
4 35 31 42 37 46 41 - - - - -
6 45 40 54 48 59 54 - - - - -
10 61 54 75 66 81 74 - - - - -
16 81 73 100 88 109 99 - - - - -
25 106 95 133 117 143 130 161 141 135 182 161
35 131 117 164 144 176 161 200 176 169 226 201
50 158 141 198 175 228 209 242 216 207 275 246
70 200 179 253 222 293 268 310 279 268 353 318
95 241 216 306 269 355 326 377 242 328 430 389
120 278 249 354 312 413 379 437 400 383 500 454
150 318 285 393 342 476 436 504 464 444 577 527
185 362 324 449 384 545 500 575 533 510 661 605
240 424 380 528 450 644 590 679 646 607 781 719
300 486 435 603 514 743 681 783 736 703 902 833
400 - - 683 584 868 793 940 868 823 1085 1008
500 - - 783 666 990 904 1083 998 946 1253 1169
630 - - 900 764 1130 1033 1254 1151 1088 1454 1362
800 - - - - 1288 1179 1358 1275 1214 1581 1485
1000 - - - - 1443 1323 1520 1436 1349 1775 1671
62
TABLE 2.7B
Multi-core XLPE insulated PVC sheathed cables,
non-armoured,
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
1 14.5 13 17 15 19 17 21 18
1.5 18.5 16.5 22 19.5 24 22 26 23
2.5 25 22 30 26 33 30 36 32
4 33 30 40 35 45 40 49 42
6 42 38 51 44 58 52 63 54
10 57 51 69 60 80 71 86 75
16 76 68 91 80 107 96 115 100
25 99 89 119 105 138 119 149 127
35 121 109 146 128 171 147 185 158
50 145 130 175 154 209 179 225 192
70 183 164 221 194 269 229 289 246
95 220 197 265 233 328 278 352 298
120 253 227 305 268 382 322 410 346
150 290 259 334 300 441 371 473 399
185 329 295 384 340 506 424 542 456
240 386 346 459 398 599 500 641 538
300 442 396 532 455 693 576 741 621
400 - - 625 536 803 667 865 741
63
TABLE 2.7C
Single-core armoured XLPE insulated cables (non-magnetic armour)
(COPPER CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 90 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 237 220 253 232 222 282 266 288 266
70 303 277 322 293 385 357 337 358 331
95 367 333 389 352 346 436 412 425 393
120 425 383 449 405 402 504 477 485 449
150 488 437 516 462 463 566 539 549 510
185 557 496 587 524 529 643 614 618 574
240 656 579 689 612 625 749 714 715 666
300 755 662 792 700 720 842 805 810 755
400 853 717 899 767 815 929 889 848 797
500 962 791 1016 851 918 1032 989 923 871
630 1082 861 1146 935 1027 1139 1092 992 940
800 1170 904 1246 987 1119 1204 1155 1042 978
1000 1261 961 1345 1055 1214 1289 1238 1110 1041
64
TABLE 2.7D
Multi-core armoured XLPE insulated cables
(COPPER CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes):
Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
1.5 27 23 29 25 25 21
2.5 36 31 39 33 33 28
4 49 42 52 44 43 36
6 62 53 66 56 53 44
10 85 73 90 78 71 58
16 110 94 115 99 91 75
25 146 124 152 131 116 96
35 180 154 188 162 139 115
50 219 187 228 197 164 135
70 279 238 291 251 203 167
95 338 289 354 304 239 197
120 392 335 410 353 271 223
150 451 386 472 406 306 251
185 515 441 539 463 343 281
240 607 520 636 546 395 324
300 698 599 732 628 446 365
400 787 673 847 728 - -
65
TABLE 2.8A
Single core PVC insulated cables, non-armoured,
with or without sheath
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 93 84 118 104 125 110 149 133 128 169 152
70 118 107 150 133 160 140 192 173 166 217 196
95 142 129 181 161 195 170 235 212 203 265 241
120 164 149 210 186 226 197 273 247 237 308 282
150 189 170 234 204 261 227 316 287 274 356 327
185 215 194 266 230 298 259 363 330 316 407 376
240 252 227 312 269 352 305 430 392 375 482 447
300 289 261 358 306 406 351 497 455 434 557 519
380 - - 413 352 511 472 543 502 507 625 584
480 - - 477 405 591 546 629 582 590 726 680
600 - - 545 462 679 626 722 669 680 837 787
740 - - - - 771 709 820 761 776 956 902
960 - - - - 900 823 953 886 907 1125 1066
1200 - - - - 1022 926 1073 999 1026 1293 1229
66
TABLE 2.8B
Multi-core PVC insulated PVC sheathed cables,
non-armoured,
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
16 44 41 54 48 66 59 73 61
25 58 53 71 62 83 73 89 78
35 71 65 86 77 103 90 111 96
50 36 78 104 92 125 110 135 117
70 108 98 131 116 160 140 173 150
95 130 118 157 139 195 170 210 183
120 - 135 - 160 - 197 - 212
150 - 155 - 176 - 227 - 245
185 - 176 - 199 - 259 - 280
240 - 207 - 232 - 305 - 330
300 - 237 - 265 - 351 - 381
67
TABLE 2.8C
Single-core armoured PVC insulated cables (non-magnetic armour)
(ALUMINIUM CONDUCTOR)
Ambient temperature : 30°C
CURRENT –CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 70 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 143 133 152 141 131 168 159 169 155
70 183 168 194 178 168 212 200 213 196
95 221 202 234 214 205 259 245 255 236
120 255 233 270 246 238 299 285 293 272
150 294 267 310 282 275 340 323 335 312
185 334 303 352 319 315 389 371 379 354
240 393 354 413 374 372 457 437 443 415
300 452 405 474 427 430 520 498 505 475
380 518 452 543 479 497 583 559 551 518
480 586 501 616 534 568 655 629 604 568
600 658 550 692 589 642 724 696 656 618
740 728 596 769 642 715 802 770 707 666
960 819 651 868 706 808 866 832 770 726
1200 893 692 952 756 880 938 902 822 774
68
TABLE 2.8D
Multi-core armoured PVC insulated cables
(ALUMINIUM CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
16 68 58 71 61
25 89 76 94 80 77 64
35 109 94 115 99 93 77
50 131 113 139 119 109 91
70 165 143 175 151 135 112
95 199 174 211 186 159 132
120 - 202 - 216 - 150
150 - 232 - 250 - 169
185 - 265 - 287 - 190
240 - 312 - 342 - 218
300 - 360 - 399 - 247
69
TABLE 2.9A
Single core XLPE insulated cables, non-armoured,
with or without sheath
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 125 113 157 140 154 136 184 165 159 210 188
70 158 142 200 179 198 174 237 215 206 271 244
95 191 171 242 217 241 211 289 264 253 332 300
120 220 197 281 251 208 245 337 308 296 387 351
150 253 226 307 267 324 283 389 358 343 448 408
185 288 256 351 300 371 323 447 413 395 515 470
240 338 300 412 351 439 382 530 492 471 611 561
300 387 344 471 402 508 440 613 571 544 708 652
380 - - - - 658 594 679 628 638 798 742
480 - - - - 765 592 786 728 743 927 865
600 - - - - 871 791 903 836 849 1058 990
740 - - - - 1001 911 1025 951 979 1218 1143
960 - - - - 1176 1072 1191 1108 1151 1440 1353
1200 - - - - 1333 1217 1341 1249 1307 1643 1550
70
TABLE 2.9B
Multi-core XLPE insulated PVC sheathed cables,
non-armoured,
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
16 60 55 72 64 84 76 91 77
25 78 71 94 84 101 90 108 97
35 96 87 115 103 126 112 135 120
50 115 104 138 124 154 136 164 146
70 145 131 175 156 198 174 211 187
95 175 157 210 188 241 211 257 227
120 - 180 - 216 - 245 - 263
150 - 206 - 240 - 283 - 304
185 - 233 - 272 - 323 - 347
240 - 273 - 318 - 382 - 409
300 - 313 - 364 - 440 - 471
71
TABLE 2.9C
Single-core armoured XLPE insulated cables (non-magnetic armour)
(ALUMINIUM CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 90 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 179 165 192 176 162 212 199 215 192
70 228 209 244 222 207 269 254 270 224
95 276 252 294 267 252 328 310 324 296
120 320 291 340 308 292 378 358 372 343
150 368 333 390 352 337 429 409 424 394
185 419 378 444 400 391 490 467 477 447
240 494 443 521 468 465 576 549 554 523
300 568 508 597 536 540 654 624 626 595
380 655 573 688 608 625 735 704 693 649
480 747 642 786 685 714 825 790 765 717
600 836 706 880 757 801 909 872 932 780
740 934 764 988 824 897 989 950 890 835
960 1056 838 1121 911 1014 1094 1052 970 911
1200 1163 903 1235 990 1118 11487 1141 1043 980
72
TABLE 2.9D
Multi-core armoured XLPE insulated cables
(ALUMINIUM CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
16 82 71 85 74 71 59
25 108 92 112 98 90 75
35 132 113 138 120 108 90
50 159 137 166 145 128 106
70 201 174 211 185 158 130
95 242 214 254 224 186 154
120 - 249 - 264 - 174
150 - 284 - 305 - 197
185 - 328 - 350 - 220
240 - 386 - 418 - 253
300 - 441 - 488 - 286
73
TABLE 2.10
Current carrying capacity of single core and multi-core mineral insulated
copper cables at 40°C ambient temperature
a) Having the sheath covered overall with PVC
b) Having the sheath bare and not exposed to touch
NOTE – Where cables of type (a) are installed bunched, the appropriate grouping factors given in Tables 2.2 and 2.3 shall
be applied for the particular installation condition. For cables of type (b) no grouping factor is necessary.
74
Nominal
cross-
Sectional area
Of conductors
Single core Multi-core
Single phase
a.c
(Amperes)
Three Phase
a.c
(Amperes)
Single phase
a.c
2 Core
(Amperes)
Three phase
a.c
2 Core
(Amperes)
7 Core
(Amperes)
(a) (b) (a) (b) (a) (b) (a) (b) (a) (b)
HEAVY DUTY TYPE LIGHT DUTY TYPE
1.0 19 24 15 24 15 20 12 17 9 12
1.5 23 31 20 31 19 25 15 21 11 14
2.5 31 41 26 41 25 35 20 29 15 21
4.0 39 54 35 54 32 45 28 38
6.0 50 70 44 70 42 58
10.0 68 94 60 94
1.0 20 28 17 28 16 22 14 18 9 13
1.5 25 35 22 35 20 28 17 23 12 16
2.5 33 45 29 45 27 37 22 31 16 22
4.0 43 60 37 60 35 49 29 40 20 29
6.0 54 74 48 74 45 62 37 52
10.0 72 101 64 101 60 84 50 70
16.0 94 134 84 134 80 110 66 94
25.0 128 173 111 173 105 149 89 120
35.0 153 211 136 211
50.0 191 264 170 264
70.0 234 322 204 322
95.0 281 389 247 389
120.0 323 451 285 451
150.0 374 518 327 518
TABLE 2.11
Current carrying capacity of mass supportable for flexible copper cords
insulated with silicone rubber
Nominal cross-sectional
area of conductor
mm²
Current carrying capacity
Single or Three phase a.c.
(Amperes)
Maximum mass supportable
by twin flexible cord
(Kg.)
0.5 3 2
0.75 6 3
1.0 10 5
1.25 13 5
1.5 15 5
2.5 20 5
4.0 25 5
NOTE - These ratings apply up to an ambient temperature of 120°C.
TABLE 2.12
NUMBER OF CABLES THAT MAY BE INSTALLED IN CABLE TRAYS
1. SINGLE CORE INSULATED AND SHEATHED CABLES AND SINGLE CORE INSULATED NON-MAGNETIC ARMOURED
CABLES.
a) Where single core cables are installed in ventilated cable trays, the sum of the combined cross -sectional
area of all cables installed in the tray shall not exceed 50 percent of the interior cross sectional area of the
cable tray.
b) Where single core cable are installed in solid bottom cable trays, the sum of the combined cross- sectional
area of all cables installed in the tray shall not exceed 40 percent of the interior cross sectio nal area of the
cable tray.
2. MULTI-CORE ARMOURED OR NON-ARMOURED CABLES.
a) Where multi -core cables are installed in ventilated cable trays, the sum of the diameter of all cables
installed shall not exceed 90 percent of the cable tray width and the cables shall be installed in a single
layer.
b) Where multi-core cables are installed in solid bottom cable trays, the sum of the diameter of all cables
installed shall not exceed 80 percent of the cable tray width and the cables shall be installed in a single
layer.
NOTE - For grouping factors refer to Table 2.3
75
APPENDIX 3
CAPACITY OF CONDUITS, TRUNKING AND UNDERFLOOR DUCTS
TABLE 3.1
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a straight run up to 10 metres without bends
Nominal cross
Sectional area
of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 6 11 - - - -
2.5 5 8 - - - -
4.0 3 5 10 - - -
6.0 2 4 7 13 - -
10.0 - 2 4 7 10 -
16.0 - 2 3 6 9 -
25.0 - - 2 4 5 10
35.0 - - - 3 4 7
50.0 - - - 2 3 5
70.0 - - - - 2 4
TABLE 3.2
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a run up to 10 metres with one bends
Nominal cross
Sectional area
of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 5 8 - - - -
2.5 4 6 - - - -
4.0 2 4 8 - - -
6.0 2 3 6 11 - -
10.0 - - 3 6 8 -
16.0 - - 2 5 7 12
25.0 - - - 3 4 8
35.0 - - - 2 3 6
50.0 - - - - 2 4
70.0 - - - - - 3
76
TABLE 3.3
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a run up to 10 metres with 2 bends
Nominal cross
Sectional area
Of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 3 6 11 - - -
2.5 2 4 8 - - -
4.0 2 3 6 - - -
6.0 - 2 4 8 11 -
10.0 - - 2 4 6 10
16.0 - - 2 3 5 9
25.0 - - - 2 3 5
35.0 - - - - 2 4
50.0 - - - - - 3
70.0 - - - - - 2
NOTE – Table 3.1, 3.2 and 3.3 apply to both steel and PVC conducts
TABLE 3.4
Capacity of conduits for simultaneous drawing of different sizes of single core
PVC insulated copper conductor in runs up to 10 metres without bends,
with one bend and with two bends.
For each size of cable it is intended to use, obtain the appropriate factor from Table 3.4A.
Add all the cables factors so obtained and compare with the conduit factor given in table 3.4B.
The conduit size which will satisfactorily accommodate the cable is that size having a factor equal to or
exceeding the sum of the cable factor.
TABLE 3.4 A
CABLE FACTOR
77
Nominal
Cross-section
area of
conductors
mm²
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
Cable factor
22
30
43
58
105
121
193
253
342
451
TABLE 3.4 B
CONDUIT FACTOR
Conduit Size 16 mm 20 mm 25 mm 32mm 38mm 50mm
Up to 10 meters run
without bend 150 244 442 783 1092 1943
Up to 10 meters run
with ONE bend 120 196 358 643 883 1571
Upto 10 meters run
with TWO bends 86 141 260 474 646 1149
TABLE 3.5
Maximum number of single core PVC insulated cables in trunking of various sizes
For each size of cable it is intended to use, obtain the appropriate factor from Table 3.5A.
Add all the cables factors so obtained and compare with the trunking factor given in table 3.5B.
The trunking size which will satisfactorily accommodate the cable is that size having a factor equal to or
exceeding the sum of the cable factor.
TABLE 3.5A
CABLE FACTOR
TABLE 3.5B
TRUNKING FACTOR
Trunking
Size
mm x mm
50x50
75x50
75x75
100x50
100x75
100x100
150x50
150x75
150x100
Trunking
Factor
1037
1555
2371
2091
3189
4252
3147
4718
6294
78
Size of
Cable
mm²
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
Cable
Factor
8
11
15
22
36
45
68
90
121
158
TABLE 3.6
Maximum number of single core PVC insulated cables
in under floor ducts of various sizes
For each size of cable it is intended to use obtain the appropriate factor from Table 3.6A.
Add all the cables factors so obtained and compare with the underfloor ducts factor given in table 3.6B.
The underfloor duct size which will satisfactorily accommodate the cable is that size having a factor equal
to or exceeding the sum of the cable factor.
TABLE 3.6A
CABLE FACTOR
Size of
Cable
mm²
1.5
2.5
4.0
6.0
10.0
16.0
Cable
Factor
8
11
15
22
36
45
TABLE 3.6B
UNDER FLOOR DUCTS FACTOR
Under floor
ducts
mm
75x25
100x50
150x25
75x38
100x38
150x38
Under floor
ducts Factor
660
875
1312
990
1312
1970
79
APPENDIX 4
MISCELLANEOUS TABLES AND DETAILS
TABLE 4.1
SIZE OF EARTH CONTINUITY CONDUCTORS AND EARTHING LEADS
Nominal cross-sectional area of
largest associated copper circuit
conductor (mm²)
Nominal cross sectional area of
copper earth continuity conductor
(mm²)
Nominal cross sectional area of
copper earthing lead (mm²)
1.5
1.0
6.0
2.5
1.0
6.0
4.0
2.5
6.0
6.0
2.5
6.0
10.0
6.0
6.0
16.0
6.0
6.0
25.0
16.0
16.0
35.0
16.0
16.0
50.0
16.0
16.0
70.0
50.0
50.0
95.0
50.0
50.0
120.0
50.0
50.0
150.0
50.0
50.0
185.0
70.0
70.0
240.0
70.0
70.0
300.0
70.0
70.0
400.0
70.0
70.0
NOTE- P.V.C insulation of earth continuity conductor should be coloured green yellow.
80
TABLE 4.2
RECOMMENDED ILLUMINATION LEVELS
AREA LUX AREA LUX
GENERAL AREAS:
CIRCULATION AREAS:
OFFICE AND SHOPS:
DRAWING OFFICE:
Corridor passage ways 100 Drawing boards 750
Lifts 150 Reference table and general 500
Stairs 150 Printing room 300
Escalators 150
SHOPS:
ENTRANCES: Conventional with counters 500
Entrance halls. Lobbies Conventional with wall displays 500
Waiting rooms 150 Self-services 500
Enquiry rooms 500 Super markets 500
Gate house 300
SHOE ROOMS:
KITCHENS: Car 500
Food stores 150 General 500
General 500
PUBLIC & EDUCATIONAL BUILDINGS:
MEDICAL & FIRST AID CENTRES:
Consulting rooms
Treatment areas
500 ASSEMBLY AND CONCERT HALLS
CINEMAS AND THEATRES:
Auditorium 100
Medical stores 100 Theater and concert halls 100
Rest rooms 150 Cinema 50
Multi-purpose hall 100 to 500
OUTDOORS: Booking offices 300
Entrance & Exits 30 Dressing rooms 300
STAFF REATAURANTS: Platforms and stages Spl.
Canteens. Cafeterias. Projection rooms 150
Dining rooms 300
STAFF ROOMS:
Changing room. Cloak rooms 150 LECTURE THEATRES:
Rest rooms 150 General 300
Stores 150 Chalk board 500
Demonstration benches 500
TELECOMMUNICATION: Examination halls, Seminar rooms, teaching spaces 500
Switchboard Rooms 300 Art rooms 500
Apparatus rooms 150 Laboratories 500
Teleprinter rooms 500
CAR PARKS: LIBRARIES:
Underground 50 Shelves. Book stack 150
Multi-story parking floors 50 Reading table 300
Ramps 75
81
AREA LUX AREA LUX
READING ROOMS: Reading 150
Newspapers & magazines 300 Night 0.1
Reference libraries 500 Night children 1
Counters 500 Watch 5
Cataloguing & sorting 500
Binding 500 CIRCULATION SPACE:
Closed book stores 100 Evening 150
Night 0.1
MUSEUMS AND ART GALLERIES:
Exhibits insensitive to light 300 NURSES STATION:
Light sensitive exhibits 150 Evening 300
Specially light sensitive light exhibits 50 Night 100
SCHOOLS: CORRIDORS:
ASSEMBLY HALLS: Day 300
General 300 Evening 200
Platform & stage Spl. Night 3
TEACHING SPACE: INTEENAL ROOMS WITHOUT NATURAL
LIGHTING:
General 300 Day 400
Chalk board 500 Evening & Night (General) 200
Evening & Night- Task lighting 400
LECTURE THEATRES:
General 300 PHARMACIES:
Chalk board 500 Dispensing benches 500
Demonstration benches 500 Shelves 150
Needlework rooms 500
Art Rooms 500 RECEPTION:
Laboratories 500 General 300
Workshops 300 Enquiry Desk 500
Dining spaces 150
Gymnasium 300 TRAINING & REHABILITATION UNITS:
Music practice room 300 General 300
Chalk boards 500
TRANSPORT TERMINAL BUILDING: Laboratories 500
Reception areas (desks)
Customs and immigration halls
500 Body store 150
Post mortem room general 300
General 300
Counters 300
Waiting areas 300
OPERATING THEATRE:
HOSPITALS. SURGERIES AND CONSULTING
ROOMS:
General 400
HOSPITALS: Operating area Spl.
Ward Units Spl. Anesthetic room 300
Bed Heads, General 30 to 50 Recovery room and
Intensive care Unit
30 to 50
82
AREA LUX AREA LUX
X-RAY DEPARTMENT: PUBLIC ROOMS:
Radio-diagnostic and fluoroscopy room 500 Coffee bars 150
Radiotherapy rooms 300
Laboratories 500 DINING ROOMS. RESTAURANTS:
General 100
SURGERIES: Baggage rooms 100
General 300 Laundries 300
Waiting Rooms 300 Cellars 150
Dining rooms, cash desk 300
DENTAL SURGERIES: Lounges 300
Chair Spl. Writing rooms 150
Laboratories 500 Cloak rooms 150
CONSULTING ROOMS: INDUSTRIAL BUILDING &PROCESSES
AIRCRAFT MAINTENANCE HANGARS:
General 300 Aircraft engine testing 750
Desk 500 Inspection and repairs 500
Examination couch 500
Ophthalmic wall and near vision charts 500 ASSEMBLY SHOPS:
Casual work 200
HOMES AND HOTELS: Rough work,
e.g. frame and heavy
Machinery assembly
300
HOMES: Medium work,
e.g. engine assembly,
vehicle body assembly
500
LIVING ROOMS: Fine work,
e.g. electronic and assembly
1000
General 50 Very fine work. e.g. instrument and small precision
mechanism assembly
1500
Casual reading 150
Sewing and darning 300 BAKERIES:
General 300
STUDIES: Decorating, icing 500
Desk and prolonged reading 300
BOILER HOUSES:
BED ROOMS: Folding. Pasting. Punching. Stitching. 500
General 50 Cutting. Assembling. embossing 750
Bed head 150
KITCHENS:
Working area 300 BOOT AND SHOE FACTORIES:
Bath room 100
Halls and landings 150 Sorting, grading.
1500
Stairs 100
Workshops 300 Clicking 1000
Garages 50
Closing preparatory operations 1000
HOTELS:
ENTRANCE HALLS: 75 Cutting table and presses 1500
Reception, cashier 300 Bottom stock preparation, lasting,
83
AREA LUX AREA LUX
Bottoming. Finishing. Shoe rooms. 1000 Inspection 1500
Hand tailoring 1500
BUILDING:
Industrialized building plants 500 COLD STORES:
Concrete shops 300 General Constant operation 300
Infrequent access 150
CANNING AND PRESERVING FACTORIES: Break-down, make-up and dispatch Air-locks 300
Preparation 500
Canned and bottled goods retorts 300 ELECTRICAL MACHINE SHOPS:
Automatic processes 200 Manufacture. Winding assembly, testing of large
machine.
750
Inspection
raw materials
finished product
750
ELECTRICAL GENRATING
STATION
Spl. Ltg.
Turbine and boiler houses:
Boiler houses, platforms etc.
150
CAR PARKS – INDOOR:
Underground 30 Boiler and turbine house basements
(including feed pump bay)
100
Multi-storey Parking floors 30
Ramps 50 Turbine and gas turbine houses
(operating floor level)
150
CARPET FACTORIES:
Winding beaming 300 Plant area:
Designing. Jacquard card cutting, setting
pattern, tufting cropping, hemming, fringing,
latexing and latex drying weaving, mending
750 Battery rooms, charger and rectifiers 100
Cable tunnels, cable basements 50
Circulating water culverts, screen chambers 50
Inspection General 1000
Piece dyeing 750 Control rooms:
Desks 300
CHEMICAL WORKS: Vertical panels 300
Exterior walkways and platforms 50 Rear panels 150
Exterior stairs and ladders 100 Nuclear reactor plants Gas circulation bays,
platforms. Reactor charge and discharge faces
150
Pump and compressor houses 150
Interior plant areas General 300
Automatic processes 200 Outdoor transformer compounds 30
Precipitator chamber, platform, etc. 100
Control rooms: Precipitator dust hopper outlets 50
Desk s 300 Pump houses 150
Vertical panels 300 Relay and telecommunication rooms 150
Rear of panels 150 Storage tanks (indoor), operating areas and filling
points of-outdoor tanks
50
CHOCOLATE AND CONFECT IONERY
FACTORIES:
Substations and switch rooms diesel
Generator rooms
150
General 300
Automatic processes 200 High voltage substation indoor
out door
100
5 Hand decorating, wrapping, packing 500
Switch rooms (metal clad and cubicle switchgear) 150
CLOTHING FACTORIES:
Matching-up 750
Cutting 750
Sewing 1000
Pressing 500
84
AREA LUX AREA LUX
ENGRAVING SHOPS: Upholstery:
Hand 1500 Cloth inspection 1500
Machine. General 500 Filling covering 500
Fine 1500 Slipping 750
Cutting, sewing 750
FARM BUILDINGS:
General purpose building 30 Mattress making:
floors 300 Assembly 500
General purpose buildings ( windowless) 50 Tape edging 1000
Farm workshops: Tool Rooms:
General 100 General 500
Workbench or machine 300 Benches 750
Production Inspection 500
Milk premises (handling and storing) 100 Spray Booths:
Sick animal pens, calf nurseries 50 Colour finishing 500
Yards 20 Clear finishing 300
FIRE STATIONS: GARAGES:
Appliance rooms 300 External apron:
External aprons 30 General 50
Pumps 300
FLOUR MILLS: Parking areas (interior) 30
Roller, purifier. Silks and packing 300 General repair, servicing, greasing, pits, washing,
polishing workbench
500
Wetting tables 500
FORGES: GAS WORK:
General 300 Exterior walkways and platform 50
Exterior stairs and ladders 100
FOUNDRIES: Retort houses, oil gas plants, water gas plants,
purifiers
100
Charging floors, tumbling, cleaning, pouring,
shaking out.
300
Rough core making 300 Governor, meter, compressor, booster and
exhauster houses
150
Fine molding, core making, inspection 500
HOSIERY AND KNITWEAR FACTORIES:
FURNITURE FACTORIES:
Raw material store 100 Flat bled knitting machines 500
Furnished good store 150 Circular knitting machines 750
Lock stitch and over locking machines 1000
Wood machining and assembly: Linking or running on 1000
Rough sawing and cutting 300 Mending 1500
Machining. Sanding and assembly of
components
500 Examination, hand finishing 1500
INSPECTION AND TESTING SHOPS (ENGINEERING)
Cabinet making:
Veneer sorting and preparation 1000 Rough work. e.g. counting 300
Veneer pressing 500 Medium work. e.g. "Go" and "No-go" gauges, sub-
assemblies
500
Components stores 150 Fine work. e.g. telecommunications equipment
calibrated scales. Precision mechanism
instruments
1000
Fitting . final inspection 750
Very fine work. e.g. gauging and inspection of
small intricate parts
1500
85
AREA LUX AREA LUX
Minute work. e.g. very small instruments 3000 PAINT SHOPS AND SPRAY BOOTHS:
JEWELLERY AND WATCH-MAKING FACTORIES: Dipping, firing, rough spraying 300
Rubbing, ordinary painting, spraying and finishing 500
General 500 Fine painting, spraying and finishing 750
Fine processes 1000 Retouching and matching 1000
Minute processes 3000
Gem cutting. Polishing, setting 1500 PHARMACEUTICALS AND FINE CHEMICAL
WORKS:
LABORATORIES (GENERAL):
General 750 Pharmaceuticals manufacture:
LAUNDRIES AND DRY CLEANING WORKS Grinding
Granulating, mixing and drying, tableting,
sterilizing and washing, preparations of solution
and filling, labeling, capping, cartooning, wrapping
500
Receiving, sorting, washing, drying, ironing
calendaring dispatch, dry cleaning, bulk machine
work
300
Hand ironing, pressing, inspection mending,
spotting
500
Fine chemical manufacture plant processing 300
LEATHER:
General 300 Fine chemical finishing 500
Pressing, glazing cutting, strafing, sewing 100 Raw materials stores 200
Inspection 750
Grading, matching 1500 PLASTIC WORK:
Manufacture of plastic raw materials Plastic
processing, Calendaring, extrusion, injection.
Compression and blow moulding, sheet
fabrication, shaping, machining, trimming,
polishing cementing
500
MACHINE AND FITTING SHOPS:
Casual work 200
Rough bench and machine work 300
Medium bench and machine work, ordinary
automatic machine, rough grinding, medium
buffing, polishing
500
PLATING SHOPS:
Fine bench and machine work, fine automatic
machine , medium grinding machine, fine
butting and polishing
1000 Vats and baths 300
Buffing, polishing, burnishing 500
Final buffing and polishing 750
MILK & OTHER BOTTLING PLANTS: POTTERIES:
General work areas 300 Grinding, filter pressing, kiln room, molding,
pressing, cleaning,.trimming, glazing, firing
300
Bottle filling 750
Bottle inspection
Enameling, coloring, decorating 750
MOTOR VEHICLE PLANTS:
General sub-assemblies, chassis assembly, car
assembly, body sub-assemblies, body assembly
500 PRINTING WORKS:
Type foundries:
Matrix making, dressing type, hand and machine
casting
300
Final inspection 750
PAINT WORK: Font assembly, sorting 750
Automatic processes 200 Composing rooms:
General 300 Hand composing, Imposing, imposition and
distribution
750
Special batch mixing 750
Colour matching 1000 Machine composition - key board 750
Machine composition - casting 300
86
AREA LUX AREA LUX
Proof Presses 750 Machines 300
Proof reading 750 Edible product processing and packing 300
Illuminated table - General lighting 300
Printing machine room presses 500
Pre make-ready 500 STRUCTURAL STEEL FABRICATION PLANTS:
Graphic reproduction:
General 500 General 300
Precision proofing, retouching, etching 1000 Marking off 500
Colour reproduction and printing inspection
colour and registration
1500
WAREHOUSE AND BULK STORE:
Large material, loading bays 150
RUBBER PROCESSING: Small material, racks 300
FACTORIES: Packing, despatch 300
Fabric preparation creels, dipping, molding,
compounding, calendaring
300 Issue counters 500
Tyre and tube making 500 WELDING AND SOLDERING SHOPS:
SHEET METAL WORKS:
Bench work, scribing, inspection 750 Gas and arc welding, rough spot welding 300
Pressing, punching, shearing, stamping, spinning,
folding
500
Medium soldering, brazing, spot welding, e.g.
domestic hardware
500
Fine soldering, spot welding, e.g. instruments 1000
Very fine soldering spot welding, e.g. electronics 1500
SLAUGHTER HOUSES:
General 500 WOODWORKING SHOPS:
Inspection 750 Rough sawing bench work sizing, planning, rough
sanding, medium machine and bench work
gluing, cooperage
500
SOAP FACTORIES:
General areas 300
Automatic processes 200 Fine bench and machine work fine sanding,
finishing
750
Control panels 300
87
AREA LUX AREA LUX
MULTI-PURPOSE SPORTS HALLS: GYMNASIA:
Athletics. Basketball, bowls, fencing, gymnastics,
judo, volley ball
300 to 700 General 500
ICE HOCKY AND SKATING (INDOOR RINKS):
BADMINTON:
National and international 300 National and international 750
Club 200 Club 500
Recreational 150 Recreational 300
BILLIARD AND SNOOKER: LAWN TENNIS (INDOOR COURTS):
National and international 500 National and international 750
Club 300 Club 500
Recreational 150 Recreational 300
BOXING:
National and international 2000 RIFLE AND PISTOL SHOOTING:
Club 1000 Firing zone 300
Recreational 300 Range 150
SQASH RACKETS: TABLE TENNIS
National and international 500 National and international playing area 500
Club 300
Recreational 300 Spectator area 150
Club playing area 300
SWIMMING: Recreational playing area 150 - 300
National and international pool 500
Spectator area 100
Club and recreational pool 300 GENERAL:
Spectator area 100 Changing rooms, showers, locker rooms 150
Training pool 300
NOTE – Higher illumination will be required if events are televised in colour.
88
89
90
91
APPENDIX 5
Testing of PVC insulated single core non-armoured
electrical cables before installation
Before starting the installation of cables, the following tests shall be carried out:
ELECTRICAL TEST REQUIREMENTS:
Test shall be made with alternating voltage of approximately sine-wave form, having a frequency in the range 50 Hz to
60 Hz, and of r.m.s. values as given in table 5.2. The required elec. tests to be applied at the cable shall be of time and
temp. as shown in table 5.2. The tests are :-
a) Conductor resistance of 20°C (Ω/Km)
b) Voltage test on complete able (No breakdown of the insulation shall occur during the test).
c) Insulation resistance at 70°C must have the minimum values as shown in table – 5.1
d) Resistance of insulation to d.c. (the exterior of insulation shall show no damage)
TABLE 5.1
Nominal cross-
sectional area of
conductor
Number &
diameter of wires
per conductor
Maximum conductor
resistance - plain
annealed copper
Km
Radial thickness
of insulation
Mean overall
diameter
(upper limit)
Minimum
insulation
resistance at
70°C
mm² No./mm Ω/Km mm mm M Ω/Km
1.5 1/3.38 12.1 0.7 3.3 0.011
1.5 7/0.50 12.1 0.7 3.4 0.010
2.5 1/1.78 7.41 0.8 3.9 0.010
2.5 7/0.67 7.41 0.8 4.2 0.009
4 7/0.85 4.61 0.8 4.8 0.0077
6 7/1.04 3.08 0.8 5.4 0.0065
10 7/1.35 1.83 1 6.8 0.0065
16 7/1.7 1.15 1 8 0.0050
25 7/2.14 0.727 1.2 9.8 0.0050
35 19/1.53 0.524 1.2 11 0.0040
50 19/1.78 0.387 1.4 13 0.0045
70 19/2.14 0.268 1.4 15 0.0035
95 19/2.52 0.193 1.6 17 0.0035
120 37/2.03 0.153 1.6 19 0.0032
37/2.25 0.124 1.8 21 0.0032
185 37/2.52 0.0991 2 23.5 0.0032
240 61/2.26 0.0754 2.2 26.5 0.0032
300 61/2.52 0.0601 2.4 29.5 0.0030
400 61/2.85 0.0470 2.6 33.5 0.0028
500 61/3.2 0.0366 2.8 37 0.0028
630 27/2.52 0.0283 2.8 41 0.0025
92
TABLE 5.2
ELECTRICAL TESTS TO BE APPLIED
Test Unit Test Requirement
Voltage test on complete cable :
Length of sample (minimum) Meter 20 No Break-down of the
insulation
Period of immersion (minimum) Hours 24
Temperature of Water °C 20±5
Applied voltage (A.C) V. 2500
Time of Application Mins. 15
Conductor resistance at 20°C.:
Length of sample Meter 1
Not more than the
Maximum value shown in
Table 1.
Insulation resistance :
Length of sample Meter 5
Not less than the minimum
value
Shown in Table 1.
Period of Immersion (minimum)
Temperture as water
Hours
°C
2
70±2
Resistance of insulation to D.C.
Length of sample Meter 5 No damage at the insulation
Period of Immersion Days 10
Temperature of solution °C 60±5
Duration of applied voltage Days 10
Test voltage Volts D.C 220
93
TABLE 5.3
PHYSICAL TEST REQUIREMENTS
The insulation shall be subjected to the tests and methods as detailed table 5.3
Test Method Property Under Test Test Requirements
A,B Minimum tensile strength (N/mm²) Minimum
elongation at break (%)
12.5 mm²
125%
C1, C2 Cold bent test : Temperature at which specimen shall not
crack (°C) -15±2°C
E3 Less of mass after ageing 10 days at 115±2°C (Max.)
(mg/cm²) 1.5 mg/cm²
E1
Number of days ageing
Ageing temperature (°C)
Tensile strength after ageing (Min. value N/mm²)
Maximum variation from unaged value (%)
Elongation at break after ageing – minimum value %
Max. variation from unaged value %
10
135±2°C
12.5 N/mm²
25%
125%
25 %
F1, F2 Hot pressure test temperature (°C) 95±2°C
F3 Maximum deformation % 50%
G1, G2 Heat shock test:
Temperature at which specimen shall not crack (°C) 150±2°C
H Minimum insulation resistance constant
(K value ) at 20 °C (M/Km)
180 M/km.
TEST CERTIFICATE SHALL BE APPROVED BY M.E.W.
94
APPENDICES, TABLES, GRAPHIC SYMBOLS
NOTES - 1. Various appendices, tables, graphic symbols, etc. are a provided in this Section. These are
to be construed as a part of the Regulations and shall be complied with .
2. Where for a particular condition of installation, the appendices, tables, etc. do not apply,
then MEW's prior approval shall be obtained for the method adopted.
APPENDIX 1
Co-ordination between conductor size and excess current protection device employed.
General Condition:
For compliance with Clause No. 750-17 of the Regulation the following conditions are to be fulfilled:
(i) The excess current protection device's nominal current or current setting (In) is not less than the design
current (IB) of the circuit, and
(ii) its nominal current or current setting does not exceed the lowest current carrying capacity (IZ) of any
of the conductors of the circuit, and
(iii) the current causing effective operation of the protective device (I2)) does not exceed 1.45 times the lowest
of the current carrying capacities (IZ) of any of the conductor of the circuit.
The above condition may be stated as formulas:
IB ≤ In ≤ IZ
I2 ≤ 1.45 IZ
In order to determine the size of the cable to be used for a particular condition of installation, it may be necessary
to apply one or more of the following correction factors:
( i) For ambient temperature - Table 2.5A of Section 15 which gives correction factor to be applied for the actual
ambient temperature of the installation when it exceeds 30°C.
(ii) For grouping - Tables 2.2, 2.3 and 2.4 of Section 15 which gives correction factors for various grouping of
circuits.
Determination of Size of Cable to be used:
Having established the designed cur rent of the circuit under consideration and having chosen the type and nominal
current or current setting of the excess current protective device it is intended to use in accordance with general
condition above, the following procedure shall be adopted to determine the size of cable:
( i) DIVIDE the nominal current of the excess current device by the appropriate ambient temperature correction
factor given in Table 2.5A for the type of cable to be used.
51
(ii) Then further, DIVIDE by any applicable correction factor for grouping given in Tables 2.2, 2.3 and
2.4.
(iii) The size of the cable to be used shall be such that its tabulated current carrying capacity for the installation
method concerned is not less than the value of the nominal current of the excess current protective device
adjusted as above.
Example:
(a) A circuit feeding a balanced three phase load of 21 KW at 0.8 P.F., 415 volts, at an ambient temperature
of 50°C by means of single core, PVC insulated cable in conduit along with another circuit.
√
Nominal current of excess current protective device = 40 Amps
2
(b) If the above circuit is run in a separate conduit,
2
(c) A single phase, 240 volts lighting circuit having a load of 2000 VA in an ambient temperature of 45 oC and wired
with single core PVC insulated cable run in a conduit having two more circuits (i.e.,) three circuits together and
protected by 10 amp circuit breaker
Nominal current of excess current protective device = 10 Amps
2
(d) If the above circuit is run in a separate conduit,
2
52
APPENDIX 2
Current Carrying Capacity for Cables
Note -1 : The current carrying capacity under this appendix applies to sheathed and
non-sheathed, and armoured and non-arnoured cables having a nominal
voltage rating not exceeding 1 kV a.c.
Note -2 : The current carrying capacities for cables in air are based upon reference
ambient temperatures of 30oC irrespective of the method of installation.
Note -3 : The current carrying capacities for buried cables, either directly in the soil or
in ducts in the ground, are based upon reference ambient temperatures of
20oC .
Note -4 : For ambient temperatures other than the reference ambient temperature, the
appropriate correction factors as given in Tables 2.5A and 2.5B are to be
applied to the values of current-carrying capacity given in Tables 2.6A to
2. 12.
Note -5 : The current carrying capacities for cables in the ground are based upon a
soil thermal resistivity of 2.5 K.m/W. Correction factors for soil thermal
resistivities other than 2.5 K.m/W are to be applied as given in Table 2.5C.
Note -6 : The current carrying capacities for directly buried cables and cables in
buried ducts are based upon a burial depth of 0.7 metres. Where the depths
of laying are different, correction factors are to be applied as given in Table
2.5D.
Note -7 : The current carrying capacities given in Tables 2.6A to 2.12 apply to single
circuits only. In case of single phase circuits, this consists of two non -
sheathed cables or two single-core cables, or one two-core cable. For 3-phase
circuits, this consists of three non-sheathed cables or three single-core cables,
or one three-core cable. Where more number of cables are installed in the
same group, the correction factors for groups as given in Tables 2.2, 2.3 and
2.4 need to be applied.
53
54
55
TABLE 2.2
Correction factors for group of more than three single-core cables
Type of
Installation
method
Number of Conductors and Correction Factor
4 6 8 10 12 16 20 24 28 32 36 40
1,2,3,4,5,6,8,9 &10 0.80 0.69 0.62 0.59 0.55 0.51 0.48 0.43 0.41 0.39 0.38 0.36
NOTE – In case of one three phase circuit employing 4 wires. no correction factor is applicable and the ratings given in
Table 2.6A to 2.12 shall be adopted. Where more than one three phase circuit is bunched in a conduit or trunking,
then appreciate grouping factor shall be taken into consideration.
TABLE 2.3
Correction factors for group of more than one multi-core armoured and non-armoured cables
Type of
Installation
method
Number of cables and Correction Factor
2 3 4 5 6 8 10 12 14 16 18 20
1,2,3,4,5,6,8,9 &10
0.80 0.70 0.65 0.60 0.57 0.52 0.48 0.45 0.43 0.41 0.39 0.38
NOTE – Where spacing between adjacent cables exceeds twice their overall diameter, no reduction factor need be applied.
TABLE 2.4
Correction factors for group of more than one multi-core armoured
and non-armoured cable buried in ground
Type of Installation method – 7 No. of Cables and Correction factors
2 3 4 5 6
Cable laid touching each other 0.81 0.70 0.63 0.59 0.55
Cables laid 15 cms apart 0.87 0.78 0.74 0.70 0.68
TABLE 2.5A
Correction factors for ambient air temperatures other than 30oC
to be applied to the current carrying capacity shown on various tables
Ambient
temperature oC
Type of Insulation
PVC XLPE
Mineral
PVC covered or bare and
exposed to touch
Bare and not
exposed to touch
45 0.79 0.87 0.78 0.88
50 0.71 0.82 0.67 0.84
55 0.61 0.76 0.57 0.80
60 0.50 0.71 0.45 0.75
56
TABLE 2.5B
Correction factors for ambient ground temperatures other than 20oC
to be applied to the current carrying capacity shown on various tables
Ground temperature oC
Insulation
PVC XLPE
10 1.10 1.07
15 1.05 1.04
20 1.00 1.00
25 0.95 0.96
30 0.89 0.93
35 0.84 0.89
40 0.77 0.85
45 0.71 0.80
50 0.63 0.76
55 0.55 0.71
60 0.45 0.65
TABLE 2.5C
Correction factors for cables buried direct in the ground or in an underground
Cable duct for soil thermal resistivities other than 2.5 K.m/W
to be applied to the current-carrying capacities for Reference Method 7
Thermal resistivity, K.m/W 0.50 0.80 1.00 1.20 1.50 2.00 2.50 3.00
Rating factor for cables in buried ducts 1.28 1.20 1.18 1.13 1.10 1.05 1.00 0.96
Rating factor for direct buried cables 1.88 1.62 1.50 1.40 1.28 1.12 1.00 0.90
TABLE 2.5D
Correction factors for depths of laying other than 0.7 m
for direct buried cables and cables in buried ducts
Depth of laying,
m Buried direct In buried ducts
0.5 1.03 1.02
0.7 1.00 1.00
1 0.97 0.98
1.25 0.95 0.96
1.5 0.94 0.95
1.75 0.93 0.94
2 0.92 0.93
2.5 0.90 0.92
3 0.89 0.91
57
TABLE 2.6A
Single core PVC insulated cables, non-armoured,
with or without sheath
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
1 11 10.5 13.5 12 15.5 14 - - - - -
1.5 14.5 13.5 17.5 15.5 20 18 - - - - -
2.5 20 18 24 21 27 25 - - - - -
4 26 24 32 28 37 33 - - - - -
6 34 31 41 36 47 43 - - - - -
10 46 42 57 50 65 59 - - - - -
16 61 56 76 68 87 79 - - - - -
25 80 73 101 89 114 104 131 114 110 146 130
35 99 89 125 110 141 129 162 143 137 181 162
50 119 108 151 134 182 167 196 174 167 219 197
70 151 136 192 171 234 214 251 225 216 281 254
95 182 164 232 207 284 261 304 275 264 341 311
120 210 188 269 239 300 303 352 321 308 396 362
150 240 216 300 262 381 349 406 372 356 456 419
185 273 245 341 296 436 400 463 427 409 521 480
240 231 286 400 346 515 472 546 507 485 615 569
300 367 328 458 394 594 545 629 587 561 709 659
400 - - 546 467 694 634 754 689 656 852 795
500 - - 626 533 792 723 868 789 749 982 920
630 - - 720 611 904 826 1005 905 855 1138 1070
800 - - - - 1030 943 1086 1020 971 1265 1188
1000 - - - - 1154 1058 1216 1149 1079 1420 1337
58
TABLE 2.6B
Multi-core PVC insulated PVC sheathed cables,
non-armoured,
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
1 11 10 13 11.5 1.5 13.5 17 14.5
1.5 14 13 16.5 15 19.5 17.5 22 18.5
2.5 18.5 17.5 23 20 27 24 30 25
4 25 23 30 27 36 32 40 34
6 32 29 38 34 46 41 51 43
10 43 39 52 46 63 57 70 60
16 57 52 69 62 85 76 94 80
25 75 68 90 80 112 96 119 101
35 92 83 111 99 138 119 148 126
50 110 99 133 118 168 144 180 153
70 139 125 168 149 213 184 232 196
95 167 150 201 179 258 223 282 238
120 192 172 232 206 299 259 328 276
150 219 196 258 225 344 299 379 319
185 248 223 294 255 392 341 434 364
240 291 261 344 297 461 403 514 430
300 334 298 394 339 530 464 593 497
400 - - 470 402 634 557 715 597
59
TABLE 2.6C
Single-core armoured PVC insulated cables (non-magnetic armour)
(COPPER CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 70 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 193 179 205 189 181 229 217 230 212
70 245 225 259 238 231 287 272 286 263
95 296 269 313 285 280 349 332 338 313
120 342 309 360 327 324 401 383 385 357
150 393 352 413 373 373 449 429 436 405
185 447 399 469 422 425 511 489 490 456
240 525 465 550 492 501 593 568 566 528
300 594 515 624 547 567 668 640 616 578
400 687 575 723 618 657 737 707 674 632
500 763 622 805 673 731 810 777 721 676
630 843 669 891 728 809 893 856 771 723
800 919 710 976 777 886 943 905 824 772
1000 975 737 1041 808 945 1008 967 872 816
60
TABLE 2.6D
Multi-core armoured PVC insulated cables
(COPPER CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
1.5 21 18 22 19 22 18
2.5 28 25 31 26 29 24
4 38 33 41 35 37 30
6 49 42 53 45 46 38
10 67 58 72 62 60 50
16 89 77 97 83 78 64
25 118 102 128 110 99 82
35 145 125 157 135 119 98
50 175 151 190 163 140 116
70 222 192 241 207 173 143
95 269 231 291 251 204 169
120 310 267 336 290 231 192
150 356 306 386 332 261 217
185 405 348 439 378 292 243
240 476 409 516 445 336 280
300 547 469 592 510 379 316
400 621 540 683 590 - -
61
TABLE 2.7A
Single core XLPE insulated cables, non-armoured,
with or without sheath
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
1 14 13 17 15 19 17.5 - - - - -
1.5 19 17 23 20 25 23 - - - - -
2.5 26 23 31 28 34 31 - - - - -
4 35 31 42 37 46 41 - - - - -
6 45 40 54 48 59 54 - - - - -
10 61 54 75 66 81 74 - - - - -
16 81 73 100 88 109 99 - - - - -
25 106 95 133 117 143 130 161 141 135 182 161
35 131 117 164 144 176 161 200 176 169 226 201
50 158 141 198 175 228 209 242 216 207 275 246
70 200 179 253 222 293 268 310 279 268 353 318
95 241 216 306 269 355 326 377 242 328 430 389
120 278 249 354 312 413 379 437 400 383 500 454
150 318 285 393 342 476 436 504 464 444 577 527
185 362 324 449 384 545 500 575 533 510 661 605
240 424 380 528 450 644 590 679 646 607 781 719
300 486 435 603 514 743 681 783 736 703 902 833
400 - - 683 584 868 793 940 868 823 1085 1008
500 - - 783 666 990 904 1083 998 946 1253 1169
630 - - 900 764 1130 1033 1254 1151 1088 1454 1362
800 - - - - 1288 1179 1358 1275 1214 1581 1485
1000 - - - - 1443 1323 1520 1436 1349 1775 1671
62
TABLE 2.7B
Multi-core XLPE insulated PVC sheathed cables,
non-armoured,
(COPPER CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
1 14.5 13 17 15 19 17 21 18
1.5 18.5 16.5 22 19.5 24 22 26 23
2.5 25 22 30 26 33 30 36 32
4 33 30 40 35 45 40 49 42
6 42 38 51 44 58 52 63 54
10 57 51 69 60 80 71 86 75
16 76 68 91 80 107 96 115 100
25 99 89 119 105 138 119 149 127
35 121 109 146 128 171 147 185 158
50 145 130 175 154 209 179 225 192
70 183 164 221 194 269 229 289 246
95 220 197 265 233 328 278 352 298
120 253 227 305 268 382 322 410 346
150 290 259 334 300 441 371 473 399
185 329 295 384 340 506 424 542 456
240 386 346 459 398 599 500 641 538
300 442 396 532 455 693 576 741 621
400 - - 625 536 803 667 865 741
63
TABLE 2.7C
Single-core armoured XLPE insulated cables (non-magnetic armour)
(COPPER CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 90 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 237 220 253 232 222 282 266 288 266
70 303 277 322 293 385 357 337 358 331
95 367 333 389 352 346 436 412 425 393
120 425 383 449 405 402 504 477 485 449
150 488 437 516 462 463 566 539 549 510
185 557 496 587 524 529 643 614 618 574
240 656 579 689 612 625 749 714 715 666
300 755 662 792 700 720 842 805 810 755
400 853 717 899 767 815 929 889 848 797
500 962 791 1016 851 918 1032 989 923 871
630 1082 861 1146 935 1027 1139 1092 992 940
800 1170 904 1246 987 1119 1204 1155 1042 978
1000 1261 961 1345 1055 1214 1289 1238 1110 1041
64
TABLE 2.7D
Multi-core armoured XLPE insulated cables
(COPPER CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes):
Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
1.5 27 23 29 25 25 21
2.5 36 31 39 33 33 28
4 49 42 52 44 43 36
6 62 53 66 56 53 44
10 85 73 90 78 71 58
16 110 94 115 99 91 75
25 146 124 152 131 116 96
35 180 154 188 162 139 115
50 219 187 228 197 164 135
70 279 238 291 251 203 167
95 338 289 354 304 239 197
120 392 335 410 353 271 223
150 451 386 472 406 306 251
185 515 441 539 463 343 281
240 607 520 636 546 395 324
300 698 599 732 628 446 365
400 787 673 847 728 - -
65
TABLE 2.8A
Single core PVC insulated cables, non-armoured,
with or without sheath
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 93 84 118 104 125 110 149 133 128 169 152
70 118 107 150 133 160 140 192 173 166 217 196
95 142 129 181 161 195 170 235 212 203 265 241
120 164 149 210 186 226 197 273 247 237 308 282
150 189 170 234 204 261 227 316 287 274 356 327
185 215 194 266 230 298 259 363 330 316 407 376
240 252 227 312 269 352 305 430 392 375 482 447
300 289 261 358 306 406 351 497 455 434 557 519
380 - - 413 352 511 472 543 502 507 625 584
480 - - 477 405 591 546 629 582 590 726 680
600 - - 545 462 679 626 722 669 680 837 787
740 - - - - 771 709 820 761 776 956 902
960 - - - - 900 823 953 886 907 1125 1066
1200 - - - - 1022 926 1073 999 1026 1293 1229
66
TABLE 2.8B
Multi-core PVC insulated PVC sheathed cables,
non-armoured,
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
16 44 41 54 48 66 59 73 61
25 58 53 71 62 83 73 89 78
35 71 65 86 77 103 90 111 96
50 36 78 104 92 125 110 135 117
70 108 98 131 116 160 140 173 150
95 130 118 157 139 195 170 210 183
120 - 135 - 160 - 197 - 212
150 - 155 - 176 - 227 - 245
185 - 176 - 199 - 259 - 280
240 - 207 - 232 - 305 - 330
300 - 237 - 265 - 351 - 381
67
TABLE 2.8C
Single-core armoured PVC insulated cables (non-magnetic armour)
(ALUMINIUM CONDUCTOR)
Ambient temperature : 30°C
CURRENT –CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 70 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 143 133 152 141 131 168 159 169 155
70 183 168 194 178 168 212 200 213 196
95 221 202 234 214 205 259 245 255 236
120 255 233 270 246 238 299 285 293 272
150 294 267 310 282 275 340 323 335 312
185 334 303 352 319 315 389 371 379 354
240 393 354 413 374 372 457 437 443 415
300 452 405 474 427 430 520 498 505 475
380 518 452 543 479 497 583 559 551 518
480 586 501 616 534 568 655 629 604 568
600 658 550 692 589 642 724 696 656 618
740 728 596 769 642 715 802 770 707 666
960 819 651 868 706 808 866 832 770 726
1200 893 692 952 756 880 938 902 822 774
68
TABLE 2.8D
Multi-core armoured PVC insulated cables
(ALUMINIUM CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 70 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
16 68 58 71 61
25 89 76 94 80 77 64
35 109 94 115 99 93 77
50 131 113 139 119 109 91
70 165 143 175 151 135 112
95 199 174 211 186 159 132
120 - 202 - 216 - 150
150 - 232 - 250 - 169
185 - 265 - 287 - 190
240 - 312 - 342 - 218
300 - 360 - 399 - 247
69
TABLE 2.9A
Single core XLPE insulated cables, non-armoured,
with or without sheath
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating
well etc. )
Installation Method
2, 3, 4 & 5
(enclosed in conduit
on wall or in
trunking etc. )
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable tray horizontal or
vertical)
Touching
Spaced
by one diameter
2 cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2
cables.
Single-
phase
a.c.
3 or 4
cables.
Three
phase
a.c.
2 cables.
Sibngle-
phase
a.c.
flat and
touching
3 or 4
cables.
Three
phase a.c.
flat and
touching
or trefoil
2 cables.
Sibngle-
phase
a.c.
Flat
3 cables.
Three
phase
a.c
flat
3 cables.
Three
phase
a.c
trefoil
2 cables, single-
phase
a.c. or 3 cables
three phase a.c. flat
Horizontal Vertical
1 2 3 4 5 6 7 8 9 10 11 12
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 125 113 157 140 154 136 184 165 159 210 188
70 158 142 200 179 198 174 237 215 206 271 244
95 191 171 242 217 241 211 289 264 253 332 300
120 220 197 281 251 208 245 337 308 296 387 351
150 253 226 307 267 324 283 389 358 343 448 408
185 288 256 351 300 371 323 447 413 395 515 470
240 338 300 412 351 439 382 530 492 471 611 561
300 387 344 471 402 508 440 613 571 544 708 652
380 - - - - 658 594 679 628 638 798 742
480 - - - - 765 592 786 728 743 927 865
600 - - - - 871 791 903 836 849 1058 990
740 - - - - 1001 911 1025 951 979 1218 1143
960 - - - - 1176 1072 1191 1108 1151 1440 1353
1200 - - - - 1333 1217 1341 1249 1307 1643 1550
70
TABLE 2.9B
Multi-core XLPE insulated PVC sheathed cables,
non-armoured,
(ALUMINIUM CONDUCTORS)
Ambient temperature: 30 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 1
(enclosed in conduit in
thermally insulating well
etc.)
Installation Method
2, 3, 4 & 5
(enclosed in conduit on
wall or in trunking etc. )
Installation Method 6
(directly to the surface of
wall or structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated
cable tray etc,
horizontal or vertical)
1 two-
core cable
Single-
phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 two-
core cable
single-
phase a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-
phase
a.c.
1 three-
core cable
or 1 four-
core
cable,
three-
phase a.c.
1 two-
core cable
Single-phase
a.c.
1 three-core
cable or 1
four-core
cable, three-
phase a.c.
1 2 3 4 5 6 7 8 9
(mm²) (A) (A) (A) (A) (A) (A) (A) (A)
16 60 55 72 64 84 76 91 77
25 78 71 94 84 101 90 108 97
35 96 87 115 103 126 112 135 120
50 115 104 138 124 154 136 164 146
70 145 131 175 156 198 174 211 187
95 175 157 210 188 241 211 257 227
120 - 180 - 216 - 245 - 263
150 - 206 - 240 - 283 - 304
185 - 233 - 272 - 323 - 347
240 - 273 - 318 - 382 - 409
300 - 313 - 364 - 440 - 471
71
TABLE 2.9C
Single-core armoured XLPE insulated cables (non-magnetic armour)
(ALUMINIUM CONDUCTOR)
Ambient temperature : 30°C
CURRENT -CARRYING CAPACITY ( ampere ) Conductor Operating temperature: 90 °C
Conductor
cross
section
al area
Installation Method 6
(directly to the surface
of wall or structure)
Installation Method 8, 9 & 10
(in free air on a ventilated cable tray, horizontal oe vertical)
Touching Touching 2 cables, single phase
a.c
3 or 4 cables, three
phase
a.c 2 cables,
single
phase
a.c flat
3 or 4
cables,
three
phase
a.c flat
2 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c flat
3 cables,
single
phase
a.c trefoil Horizontal Vertical Horizontal Vertical
1 2 3 4 5 6 7 8 9 10
(mm²) (A) (A) (A) (A) (A) (A) (A) (A) (A)
50 179 165 192 176 162 212 199 215 192
70 228 209 244 222 207 269 254 270 224
95 276 252 294 267 252 328 310 324 296
120 320 291 340 308 292 378 358 372 343
150 368 333 390 352 337 429 409 424 394
185 419 378 444 400 391 490 467 477 447
240 494 443 521 468 465 576 549 554 523
300 568 508 597 536 540 654 624 626 595
380 655 573 688 608 625 735 704 693 649
480 747 642 786 685 714 825 790 765 717
600 836 706 880 757 801 909 872 932 780
740 934 764 988 824 897 989 950 890 835
960 1056 838 1121 911 1014 1094 1052 970 911
1200 1163 903 1235 990 1118 11487 1141 1043 980
72
TABLE 2.9D
Multi-core armoured XLPE insulated cables
(ALUMINIUM CONDUCTORS)
Air ambient temperature: 30 C
Ground ambient temperature: 20 C
CURRENT-CARRYING CAPACITY (amperes): Conductor operating temperature: 90 C
Conductor
cross-
sectional
area
Installation Method 6
(directly to the surface of wall or
structure)
Installation Method 8, 9 & 10
(in free air or on a ventilated cable
tray etc, horizontal or vertical)
Installation Method 7
(direct in ground or in ducting in
ground)
1 two- core
cable,
Single-phase
a.c.
1 three or
four-core
cable,
three-phase
a.c.
1 two- core
cable, single-
phase
a.c.
1 three or
four-
core cable,
three-phase
a.c.
1 two- core
cable,
Single-phase
a.c.
1 three or four-
core cable,
three-phase
a.c.
1 2 3 4 5 6 7
(mm²) (A) (A) (A) (A) (A) (A)
16 82 71 85 74 71 59
25 108 92 112 98 90 75
35 132 113 138 120 108 90
50 159 137 166 145 128 106
70 201 174 211 185 158 130
95 242 214 254 224 186 154
120 - 249 - 264 - 174
150 - 284 - 305 - 197
185 - 328 - 350 - 220
240 - 386 - 418 - 253
300 - 441 - 488 - 286
73
TABLE 2.10
Current carrying capacity of single core and multi-core mineral insulated
copper cables at 40°C ambient temperature
a) Having the sheath covered overall with PVC
b) Having the sheath bare and not exposed to touch
NOTE – Where cables of type (a) are installed bunched, the appropriate grouping factors given in Tables 2.2 and 2.3 shall
be applied for the particular installation condition. For cables of type (b) no grouping factor is necessary.
74
Nominal
cross-
Sectional area
Of conductors
Single core Multi-core
Single phase
a.c
(Amperes)
Three Phase
a.c
(Amperes)
Single phase
a.c
2 Core
(Amperes)
Three phase
a.c
2 Core
(Amperes)
7 Core
(Amperes)
(a) (b) (a) (b) (a) (b) (a) (b) (a) (b)
HEAVY DUTY TYPE LIGHT DUTY TYPE
1.0 19 24 15 24 15 20 12 17 9 12
1.5 23 31 20 31 19 25 15 21 11 14
2.5 31 41 26 41 25 35 20 29 15 21
4.0 39 54 35 54 32 45 28 38
6.0 50 70 44 70 42 58
10.0 68 94 60 94
1.0 20 28 17 28 16 22 14 18 9 13
1.5 25 35 22 35 20 28 17 23 12 16
2.5 33 45 29 45 27 37 22 31 16 22
4.0 43 60 37 60 35 49 29 40 20 29
6.0 54 74 48 74 45 62 37 52
10.0 72 101 64 101 60 84 50 70
16.0 94 134 84 134 80 110 66 94
25.0 128 173 111 173 105 149 89 120
35.0 153 211 136 211
50.0 191 264 170 264
70.0 234 322 204 322
95.0 281 389 247 389
120.0 323 451 285 451
150.0 374 518 327 518
TABLE 2.11
Current carrying capacity of mass supportable for flexible copper cords
insulated with silicone rubber
Nominal cross-sectional
area of conductor
mm²
Current carrying capacity
Single or Three phase a.c.
(Amperes)
Maximum mass supportable
by twin flexible cord
(Kg.)
0.5 3 2
0.75 6 3
1.0 10 5
1.25 13 5
1.5 15 5
2.5 20 5
4.0 25 5
NOTE - These ratings apply up to an ambient temperature of 120°C.
TABLE 2.12
NUMBER OF CABLES THAT MAY BE INSTALLED IN CABLE TRAYS
1. SINGLE CORE INSULATED AND SHEATHED CABLES AND SINGLE CORE INSULATED NON-MAGNETIC ARMOURED
CABLES.
a) Where single core cables are installed in ventilated cable trays, the sum of the combined cross -sectional
area of all cables installed in the tray shall not exceed 50 percent of the interior cross sectional area of the
cable tray.
b) Where single core cable are installed in solid bottom cable trays, the sum of the combined cross- sectional
area of all cables installed in the tray shall not exceed 40 percent of the interior cross sectio nal area of the
cable tray.
2. MULTI-CORE ARMOURED OR NON-ARMOURED CABLES.
a) Where multi -core cables are installed in ventilated cable trays, the sum of the diameter of all cables
installed shall not exceed 90 percent of the cable tray width and the cables shall be installed in a single
layer.
b) Where multi-core cables are installed in solid bottom cable trays, the sum of the diameter of all cables
installed shall not exceed 80 percent of the cable tray width and the cables shall be installed in a single
layer.
NOTE - For grouping factors refer to Table 2.3
75
APPENDIX 3
CAPACITY OF CONDUITS, TRUNKING AND UNDERFLOOR DUCTS
TABLE 3.1
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a straight run up to 10 metres without bends
Nominal cross
Sectional area
of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 6 11 - - - -
2.5 5 8 - - - -
4.0 3 5 10 - - -
6.0 2 4 7 13 - -
10.0 - 2 4 7 10 -
16.0 - 2 3 6 9 -
25.0 - - 2 4 5 10
35.0 - - - 3 4 7
50.0 - - - 2 3 5
70.0 - - - - 2 4
TABLE 3.2
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a run up to 10 metres with one bends
Nominal cross
Sectional area
of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 5 8 - - - -
2.5 4 6 - - - -
4.0 2 4 8 - - -
6.0 2 3 6 11 - -
10.0 - - 3 6 8 -
16.0 - - 2 5 7 12
25.0 - - - 3 4 8
35.0 - - - 2 3 6
50.0 - - - - 2 4
70.0 - - - - - 3
76
TABLE 3.3
Capacity of conduits for simultaneous drawing of single core PVC insulated cable
for a run up to 10 metres with 2 bends
Nominal cross
Sectional area
Of conductor
Size of Conduits (mm)
16 20 25 32 38 50
1.5 3 6 11 - - -
2.5 2 4 8 - - -
4.0 2 3 6 - - -
6.0 - 2 4 8 11 -
10.0 - - 2 4 6 10
16.0 - - 2 3 5 9
25.0 - - - 2 3 5
35.0 - - - - 2 4
50.0 - - - - - 3
70.0 - - - - - 2
NOTE – Table 3.1, 3.2 and 3.3 apply to both steel and PVC conducts
TABLE 3.4
Capacity of conduits for simultaneous drawing of different sizes of single core
PVC insulated copper conductor in runs up to 10 metres without bends,
with one bend and with two bends.
For each size of cable it is intended to use, obtain the appropriate factor from Table 3.4A.
Add all the cables factors so obtained and compare with the conduit factor given in table 3.4B.
The conduit size which will satisfactorily accommodate the cable is that size having a factor equal to or
exceeding the sum of the cable factor.
TABLE 3.4 A
CABLE FACTOR
77
Nominal
Cross-section
area of
conductors
mm²
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
Cable factor
22
30
43
58
105
121
193
253
342
451
TABLE 3.4 B
CONDUIT FACTOR
Conduit Size 16 mm 20 mm 25 mm 32mm 38mm 50mm
Up to 10 meters run
without bend 150 244 442 783 1092 1943
Up to 10 meters run
with ONE bend 120 196 358 643 883 1571
Upto 10 meters run
with TWO bends 86 141 260 474 646 1149
TABLE 3.5
Maximum number of single core PVC insulated cables in trunking of various sizes
For each size of cable it is intended to use, obtain the appropriate factor from Table 3.5A.
Add all the cables factors so obtained and compare with the trunking factor given in table 3.5B.
The trunking size which will satisfactorily accommodate the cable is that size having a factor equal to or
exceeding the sum of the cable factor.
TABLE 3.5A
CABLE FACTOR
TABLE 3.5B
TRUNKING FACTOR
Trunking
Size
mm x mm
50x50
75x50
75x75
100x50
100x75
100x100
150x50
150x75
150x100
Trunking
Factor
1037
1555
2371
2091
3189
4252
3147
4718
6294
78
Size of
Cable
mm²
1.5
2.5
4.0
6.0
10.0
16.0
25.0
35.0
50.0
70.0
Cable
Factor
8
11
15
22
36
45
68
90
121
158
TABLE 3.6
Maximum number of single core PVC insulated cables
in under floor ducts of various sizes
For each size of cable it is intended to use obtain the appropriate factor from Table 3.6A.
Add all the cables factors so obtained and compare with the underfloor ducts factor given in table 3.6B.
The underfloor duct size which will satisfactorily accommodate the cable is that size having a factor equal
to or exceeding the sum of the cable factor.
TABLE 3.6A
CABLE FACTOR
Size of
Cable
mm²
1.5
2.5
4.0
6.0
10.0
16.0
Cable
Factor
8
11
15
22
36
45
TABLE 3.6B
UNDER FLOOR DUCTS FACTOR
Under floor
ducts
mm
75x25
100x50
150x25
75x38
100x38
150x38
Under floor
ducts Factor
660
875
1312
990
1312
1970
79
APPENDIX 4
MISCELLANEOUS TABLES AND DETAILS
TABLE 4.1
SIZE OF EARTH CONTINUITY CONDUCTORS AND EARTHING LEADS
Nominal cross-sectional area of
largest associated copper circuit
conductor (mm²)
Nominal cross sectional area of
copper earth continuity conductor
(mm²)
Nominal cross sectional area of
copper earthing lead (mm²)
1.5
1.0
6.0
2.5
1.0
6.0
4.0
2.5
6.0
6.0
2.5
6.0
10.0
6.0
6.0
16.0
6.0
6.0
25.0
16.0
16.0
35.0
16.0
16.0
50.0
16.0
16.0
70.0
50.0
50.0
95.0
50.0
50.0
120.0
50.0
50.0
150.0
50.0
50.0
185.0
70.0
70.0
240.0
70.0
70.0
300.0
70.0
70.0
400.0
70.0
70.0
NOTE- P.V.C insulation of earth continuity conductor should be coloured green yellow.
80
TABLE 4.2
RECOMMENDED ILLUMINATION LEVELS
AREA LUX AREA LUX
GENERAL AREAS:
CIRCULATION AREAS:
OFFICE AND SHOPS:
DRAWING OFFICE:
Corridor passage ways 100 Drawing boards 750
Lifts 150 Reference table and general 500
Stairs 150 Printing room 300
Escalators 150
SHOPS:
ENTRANCES: Conventional with counters 500
Entrance halls. Lobbies Conventional with wall displays 500
Waiting rooms 150 Self-services 500
Enquiry rooms 500 Super markets 500
Gate house 300
SHOE ROOMS:
KITCHENS: Car 500
Food stores 150 General 500
General 500
PUBLIC & EDUCATIONAL BUILDINGS:
MEDICAL & FIRST AID CENTRES:
Consulting rooms
Treatment areas
500 ASSEMBLY AND CONCERT HALLS
CINEMAS AND THEATRES:
Auditorium 100
Medical stores 100 Theater and concert halls 100
Rest rooms 150 Cinema 50
Multi-purpose hall 100 to 500
OUTDOORS: Booking offices 300
Entrance & Exits 30 Dressing rooms 300
STAFF REATAURANTS: Platforms and stages Spl.
Canteens. Cafeterias. Projection rooms 150
Dining rooms 300
STAFF ROOMS:
Changing room. Cloak rooms 150 LECTURE THEATRES:
Rest rooms 150 General 300
Stores 150 Chalk board 500
Demonstration benches 500
TELECOMMUNICATION: Examination halls, Seminar rooms, teaching spaces 500
Switchboard Rooms 300 Art rooms 500
Apparatus rooms 150 Laboratories 500
Teleprinter rooms 500
CAR PARKS: LIBRARIES:
Underground 50 Shelves. Book stack 150
Multi-story parking floors 50 Reading table 300
Ramps 75
81
AREA LUX AREA LUX
READING ROOMS: Reading 150
Newspapers & magazines 300 Night 0.1
Reference libraries 500 Night children 1
Counters 500 Watch 5
Cataloguing & sorting 500
Binding 500 CIRCULATION SPACE:
Closed book stores 100 Evening 150
Night 0.1
MUSEUMS AND ART GALLERIES:
Exhibits insensitive to light 300 NURSES STATION:
Light sensitive exhibits 150 Evening 300
Specially light sensitive light exhibits 50 Night 100
SCHOOLS: CORRIDORS:
ASSEMBLY HALLS: Day 300
General 300 Evening 200
Platform & stage Spl. Night 3
TEACHING SPACE: INTEENAL ROOMS WITHOUT NATURAL
LIGHTING:
General 300 Day 400
Chalk board 500 Evening & Night (General) 200
Evening & Night- Task lighting 400
LECTURE THEATRES:
General 300 PHARMACIES:
Chalk board 500 Dispensing benches 500
Demonstration benches 500 Shelves 150
Needlework rooms 500
Art Rooms 500 RECEPTION:
Laboratories 500 General 300
Workshops 300 Enquiry Desk 500
Dining spaces 150
Gymnasium 300 TRAINING & REHABILITATION UNITS:
Music practice room 300 General 300
Chalk boards 500
TRANSPORT TERMINAL BUILDING: Laboratories 500
Reception areas (desks)
Customs and immigration halls
500 Body store 150
Post mortem room general 300
General 300
Counters 300
Waiting areas 300
OPERATING THEATRE:
HOSPITALS. SURGERIES AND CONSULTING
ROOMS:
General 400
HOSPITALS: Operating area Spl.
Ward Units Spl. Anesthetic room 300
Bed Heads, General 30 to 50 Recovery room and
Intensive care Unit
30 to 50
82
AREA LUX AREA LUX
X-RAY DEPARTMENT: PUBLIC ROOMS:
Radio-diagnostic and fluoroscopy room 500 Coffee bars 150
Radiotherapy rooms 300
Laboratories 500 DINING ROOMS. RESTAURANTS:
General 100
SURGERIES: Baggage rooms 100
General 300 Laundries 300
Waiting Rooms 300 Cellars 150
Dining rooms, cash desk 300
DENTAL SURGERIES: Lounges 300
Chair Spl. Writing rooms 150
Laboratories 500 Cloak rooms 150
CONSULTING ROOMS: INDUSTRIAL BUILDING &PROCESSES
AIRCRAFT MAINTENANCE HANGARS:
General 300 Aircraft engine testing 750
Desk 500 Inspection and repairs 500
Examination couch 500
Ophthalmic wall and near vision charts 500 ASSEMBLY SHOPS:
Casual work 200
HOMES AND HOTELS: Rough work,
e.g. frame and heavy
Machinery assembly
300
HOMES: Medium work,
e.g. engine assembly,
vehicle body assembly
500
LIVING ROOMS: Fine work,
e.g. electronic and assembly
1000
General 50 Very fine work. e.g. instrument and small precision
mechanism assembly
1500
Casual reading 150
Sewing and darning 300 BAKERIES:
General 300
STUDIES: Decorating, icing 500
Desk and prolonged reading 300
BOILER HOUSES:
BED ROOMS: Folding. Pasting. Punching. Stitching. 500
General 50 Cutting. Assembling. embossing 750
Bed head 150
KITCHENS:
Working area 300 BOOT AND SHOE FACTORIES:
Bath room 100
Halls and landings 150 Sorting, grading.
1500
Stairs 100
Workshops 300 Clicking 1000
Garages 50
Closing preparatory operations 1000
HOTELS:
ENTRANCE HALLS: 75 Cutting table and presses 1500
Reception, cashier 300 Bottom stock preparation, lasting,
83
AREA LUX AREA LUX
Bottoming. Finishing. Shoe rooms. 1000 Inspection 1500
Hand tailoring 1500
BUILDING:
Industrialized building plants 500 COLD STORES:
Concrete shops 300 General Constant operation 300
Infrequent access 150
CANNING AND PRESERVING FACTORIES: Break-down, make-up and dispatch Air-locks 300
Preparation 500
Canned and bottled goods retorts 300 ELECTRICAL MACHINE SHOPS:
Automatic processes 200 Manufacture. Winding assembly, testing of large
machine.
750
Inspection
raw materials
finished product
750
ELECTRICAL GENRATING
STATION
Spl. Ltg.
Turbine and boiler houses:
Boiler houses, platforms etc.
150
CAR PARKS – INDOOR:
Underground 30 Boiler and turbine house basements
(including feed pump bay)
100
Multi-storey Parking floors 30
Ramps 50 Turbine and gas turbine houses
(operating floor level)
150
CARPET FACTORIES:
Winding beaming 300 Plant area:
Designing. Jacquard card cutting, setting
pattern, tufting cropping, hemming, fringing,
latexing and latex drying weaving, mending
750 Battery rooms, charger and rectifiers 100
Cable tunnels, cable basements 50
Circulating water culverts, screen chambers 50
Inspection General 1000
Piece dyeing 750 Control rooms:
Desks 300
CHEMICAL WORKS: Vertical panels 300
Exterior walkways and platforms 50 Rear panels 150
Exterior stairs and ladders 100 Nuclear reactor plants Gas circulation bays,
platforms. Reactor charge and discharge faces
150
Pump and compressor houses 150
Interior plant areas General 300
Automatic processes 200 Outdoor transformer compounds 30
Precipitator chamber, platform, etc. 100
Control rooms: Precipitator dust hopper outlets 50
Desk s 300 Pump houses 150
Vertical panels 300 Relay and telecommunication rooms 150
Rear of panels 150 Storage tanks (indoor), operating areas and filling
points of-outdoor tanks
50
CHOCOLATE AND CONFECT IONERY
FACTORIES:
Substations and switch rooms diesel
Generator rooms
150
General 300
Automatic processes 200 High voltage substation indoor
out door
100
5 Hand decorating, wrapping, packing 500
Switch rooms (metal clad and cubicle switchgear) 150
CLOTHING FACTORIES:
Matching-up 750
Cutting 750
Sewing 1000
Pressing 500
84
AREA LUX AREA LUX
ENGRAVING SHOPS: Upholstery:
Hand 1500 Cloth inspection 1500
Machine. General 500 Filling covering 500
Fine 1500 Slipping 750
Cutting, sewing 750
FARM BUILDINGS:
General purpose building 30 Mattress making:
floors 300 Assembly 500
General purpose buildings ( windowless) 50 Tape edging 1000
Farm workshops: Tool Rooms:
General 100 General 500
Workbench or machine 300 Benches 750
Production Inspection 500
Milk premises (handling and storing) 100 Spray Booths:
Sick animal pens, calf nurseries 50 Colour finishing 500
Yards 20 Clear finishing 300
FIRE STATIONS: GARAGES:
Appliance rooms 300 External apron:
External aprons 30 General 50
Pumps 300
FLOUR MILLS: Parking areas (interior) 30
Roller, purifier. Silks and packing 300 General repair, servicing, greasing, pits, washing,
polishing workbench
500
Wetting tables 500
FORGES: GAS WORK:
General 300 Exterior walkways and platform 50
Exterior stairs and ladders 100
FOUNDRIES: Retort houses, oil gas plants, water gas plants,
purifiers
100
Charging floors, tumbling, cleaning, pouring,
shaking out.
300
Rough core making 300 Governor, meter, compressor, booster and
exhauster houses
150
Fine molding, core making, inspection 500
HOSIERY AND KNITWEAR FACTORIES:
FURNITURE FACTORIES:
Raw material store 100 Flat bled knitting machines 500
Furnished good store 150 Circular knitting machines 750
Lock stitch and over locking machines 1000
Wood machining and assembly: Linking or running on 1000
Rough sawing and cutting 300 Mending 1500
Machining. Sanding and assembly of
components
500 Examination, hand finishing 1500
INSPECTION AND TESTING SHOPS (ENGINEERING)
Cabinet making:
Veneer sorting and preparation 1000 Rough work. e.g. counting 300
Veneer pressing 500 Medium work. e.g. "Go" and "No-go" gauges, sub-
assemblies
500
Components stores 150 Fine work. e.g. telecommunications equipment
calibrated scales. Precision mechanism
instruments
1000
Fitting . final inspection 750
Very fine work. e.g. gauging and inspection of
small intricate parts
1500
85
AREA LUX AREA LUX
Minute work. e.g. very small instruments 3000 PAINT SHOPS AND SPRAY BOOTHS:
JEWELLERY AND WATCH-MAKING FACTORIES: Dipping, firing, rough spraying 300
Rubbing, ordinary painting, spraying and finishing 500
General 500 Fine painting, spraying and finishing 750
Fine processes 1000 Retouching and matching 1000
Minute processes 3000
Gem cutting. Polishing, setting 1500 PHARMACEUTICALS AND FINE CHEMICAL
WORKS:
LABORATORIES (GENERAL):
General 750 Pharmaceuticals manufacture:
LAUNDRIES AND DRY CLEANING WORKS Grinding
Granulating, mixing and drying, tableting,
sterilizing and washing, preparations of solution
and filling, labeling, capping, cartooning, wrapping
500
Receiving, sorting, washing, drying, ironing
calendaring dispatch, dry cleaning, bulk machine
work
300
Hand ironing, pressing, inspection mending,
spotting
500
Fine chemical manufacture plant processing 300
LEATHER:
General 300 Fine chemical finishing 500
Pressing, glazing cutting, strafing, sewing 100 Raw materials stores 200
Inspection 750
Grading, matching 1500 PLASTIC WORK:
Manufacture of plastic raw materials Plastic
processing, Calendaring, extrusion, injection.
Compression and blow moulding, sheet
fabrication, shaping, machining, trimming,
polishing cementing
500
MACHINE AND FITTING SHOPS:
Casual work 200
Rough bench and machine work 300
Medium bench and machine work, ordinary
automatic machine, rough grinding, medium
buffing, polishing
500
PLATING SHOPS:
Fine bench and machine work, fine automatic
machine , medium grinding machine, fine
butting and polishing
1000 Vats and baths 300
Buffing, polishing, burnishing 500
Final buffing and polishing 750
MILK & OTHER BOTTLING PLANTS: POTTERIES:
General work areas 300 Grinding, filter pressing, kiln room, molding,
pressing, cleaning,.trimming, glazing, firing
300
Bottle filling 750
Bottle inspection
Enameling, coloring, decorating 750
MOTOR VEHICLE PLANTS:
General sub-assemblies, chassis assembly, car
assembly, body sub-assemblies, body assembly
500 PRINTING WORKS:
Type foundries:
Matrix making, dressing type, hand and machine
casting
300
Final inspection 750
PAINT WORK: Font assembly, sorting 750
Automatic processes 200 Composing rooms:
General 300 Hand composing, Imposing, imposition and
distribution
750
Special batch mixing 750
Colour matching 1000 Machine composition - key board 750
Machine composition - casting 300
86
AREA LUX AREA LUX
Proof Presses 750 Machines 300
Proof reading 750 Edible product processing and packing 300
Illuminated table - General lighting 300
Printing machine room presses 500
Pre make-ready 500 STRUCTURAL STEEL FABRICATION PLANTS:
Graphic reproduction:
General 500 General 300
Precision proofing, retouching, etching 1000 Marking off 500
Colour reproduction and printing inspection
colour and registration
1500
WAREHOUSE AND BULK STORE:
Large material, loading bays 150
RUBBER PROCESSING: Small material, racks 300
FACTORIES: Packing, despatch 300
Fabric preparation creels, dipping, molding,
compounding, calendaring
300 Issue counters 500
Tyre and tube making 500 WELDING AND SOLDERING SHOPS:
SHEET METAL WORKS:
Bench work, scribing, inspection 750 Gas and arc welding, rough spot welding 300
Pressing, punching, shearing, stamping, spinning,
folding
500
Medium soldering, brazing, spot welding, e.g.
domestic hardware
500
Fine soldering, spot welding, e.g. instruments 1000
Very fine soldering spot welding, e.g. electronics 1500
SLAUGHTER HOUSES:
General 500 WOODWORKING SHOPS:
Inspection 750 Rough sawing bench work sizing, planning, rough
sanding, medium machine and bench work
gluing, cooperage
500
SOAP FACTORIES:
General areas 300
Automatic processes 200 Fine bench and machine work fine sanding,
finishing
750
Control panels 300
87
AREA LUX AREA LUX
MULTI-PURPOSE SPORTS HALLS: GYMNASIA:
Athletics. Basketball, bowls, fencing, gymnastics,
judo, volley ball
300 to 700 General 500
ICE HOCKY AND SKATING (INDOOR RINKS):
BADMINTON:
National and international 300 National and international 750
Club 200 Club 500
Recreational 150 Recreational 300
BILLIARD AND SNOOKER: LAWN TENNIS (INDOOR COURTS):
National and international 500 National and international 750
Club 300 Club 500
Recreational 150 Recreational 300
BOXING:
National and international 2000 RIFLE AND PISTOL SHOOTING:
Club 1000 Firing zone 300
Recreational 300 Range 150
SQASH RACKETS: TABLE TENNIS
National and international 500 National and international playing area 500
Club 300
Recreational 300 Spectator area 150
Club playing area 300
SWIMMING: Recreational playing area 150 - 300
National and international pool 500
Spectator area 100
Club and recreational pool 300 GENERAL:
Spectator area 100 Changing rooms, showers, locker rooms 150
Training pool 300
NOTE – Higher illumination will be required if events are televised in colour.
88
89
90
91
APPENDIX 5
Testing of PVC insulated single core non-armoured
electrical cables before installation
Before starting the installation of cables, the following tests shall be carried out:
ELECTRICAL TEST REQUIREMENTS:
Test shall be made with alternating voltage of approximately sine-wave form, having a frequency in the range 50 Hz to
60 Hz, and of r.m.s. values as given in table 5.2. The required elec. tests to be applied at the cable shall be of time and
temp. as shown in table 5.2. The tests are :-
a) Conductor resistance of 20°C (Ω/Km)
b) Voltage test on complete able (No breakdown of the insulation shall occur during the test).
c) Insulation resistance at 70°C must have the minimum values as shown in table – 5.1
d) Resistance of insulation to d.c. (the exterior of insulation shall show no damage)
TABLE 5.1
Nominal cross-
sectional area of
conductor
Number &
diameter of wires
per conductor
Maximum conductor
resistance - plain
annealed copper
Km
Radial thickness
of insulation
Mean overall
diameter
(upper limit)
Minimum
insulation
resistance at
70°C
mm² No./mm Ω/Km mm mm M Ω/Km
1.5 1/3.38 12.1 0.7 3.3 0.011
1.5 7/0.50 12.1 0.7 3.4 0.010
2.5 1/1.78 7.41 0.8 3.9 0.010
2.5 7/0.67 7.41 0.8 4.2 0.009
4 7/0.85 4.61 0.8 4.8 0.0077
6 7/1.04 3.08 0.8 5.4 0.0065
10 7/1.35 1.83 1 6.8 0.0065
16 7/1.7 1.15 1 8 0.0050
25 7/2.14 0.727 1.2 9.8 0.0050
35 19/1.53 0.524 1.2 11 0.0040
50 19/1.78 0.387 1.4 13 0.0045
70 19/2.14 0.268 1.4 15 0.0035
95 19/2.52 0.193 1.6 17 0.0035
120 37/2.03 0.153 1.6 19 0.0032
37/2.25 0.124 1.8 21 0.0032
185 37/2.52 0.0991 2 23.5 0.0032
240 61/2.26 0.0754 2.2 26.5 0.0032
300 61/2.52 0.0601 2.4 29.5 0.0030
400 61/2.85 0.0470 2.6 33.5 0.0028
500 61/3.2 0.0366 2.8 37 0.0028
630 27/2.52 0.0283 2.8 41 0.0025
92
TABLE 5.2
ELECTRICAL TESTS TO BE APPLIED
Test Unit Test Requirement
Voltage test on complete cable :
Length of sample (minimum) Meter 20 No Break-down of the
insulation
Period of immersion (minimum) Hours 24
Temperature of Water °C 20±5
Applied voltage (A.C) V. 2500
Time of Application Mins. 15
Conductor resistance at 20°C.:
Length of sample Meter 1
Not more than the
Maximum value shown in
Table 1.
Insulation resistance :
Length of sample Meter 5
Not less than the minimum
value
Shown in Table 1.
Period of Immersion (minimum)
Temperture as water
Hours
°C
2
70±2
Resistance of insulation to D.C.
Length of sample Meter 5 No damage at the insulation
Period of Immersion Days 10
Temperature of solution °C 60±5
Duration of applied voltage Days 10
Test voltage Volts D.C 220
93
TABLE 5.3
PHYSICAL TEST REQUIREMENTS
The insulation shall be subjected to the tests and methods as detailed table 5.3
Test Method Property Under Test Test Requirements
A,B Minimum tensile strength (N/mm²) Minimum
elongation at break (%)
12.5 mm²
125%
C1, C2 Cold bent test : Temperature at which specimen shall not
crack (°C) -15±2°C
E3 Less of mass after ageing 10 days at 115±2°C (Max.)
(mg/cm²) 1.5 mg/cm²
E1
Number of days ageing
Ageing temperature (°C)
Tensile strength after ageing (Min. value N/mm²)
Maximum variation from unaged value (%)
Elongation at break after ageing – minimum value %
Max. variation from unaged value %
10
135±2°C
12.5 N/mm²
25%
125%
25 %
F1, F2 Hot pressure test temperature (°C) 95±2°C
F3 Maximum deformation % 50%
G1, G2 Heat shock test:
Temperature at which specimen shall not crack (°C) 150±2°C
H Minimum insulation resistance constant
(K value ) at 20 °C (M/Km)
180 M/km.
TEST CERTIFICATE SHALL BE APPROVED BY M.E.W.
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