S-1 — المواصفات العامة للتركيبات الكهربائية
F قنوات الكابلات
الصفحة 32 في الوثيقة الأصلية
عرض PDFF. TRUNKINGS:
F.1. STANDARDS:
Cable trunking and Bus -bar trunking shall comply with the following standards as
appropriate:-
F.2 STEEL CABLE TRUNKING:
F.2.1 Steel cable trunking shall be made of painted zinc coated steel.
F.2.2 The cable trunking shall have inward turned flanges on the body for strengthening.
F.2.3 The cable trunking shall be complete with easily fitted covers which are locked in place by flush
pattern turn button.
F.2.4 Standard trunking accessories: Tees, angle tees, four way through boxes, off sets , etc., shall be
used. These accessories shall be made by the same steel trunking manufacturers.
F.2.5 Each length of the cable trunking and accessories shall be complete with coupling and earth
copper links.
F.3 NON-METALLIC CABLE TRUNKING:
F.3.1 Non-Metallic cable trunking and its accessories shall be made from high impact non- combustible
polyvinyl-chloride with precise extruded section suitable for use a thigh temperature.
F.3.2 All cable trunking shall be provided with removable covers. Cover shall be maximum 1.5 metre
in length.
32
BS EN 50085-1
Cable trunking systems and cable ducting systems for
electrical installations - General requirements
BS EN 50 085-2
Cable trunking systems and cable ducting systems for
electrical installations - Cable trunking systems and cable
ducting systems intended for mounting on walls and
ceilings
BS 4678-2 Cable trunking - Steel under floor (duct) trunking
IEC/BS EN 61439-1
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
IEC/BS EN 61439-6 Low-voltage switchgear and controlgear assemblies –
Part 6: Busbar trunking systems (busways)
BS EN 10346
Continuously hot-dip coated steel flat products. Technical
delivery conditions
F.4 BUSBAR TRUNKING:
F.4.1 The Busbar trunking shall be three phase and neutral. Rating shall be as indicated on the
drawings. The trunking system shall be designed, manufactured and type tested to IEC 61439-6,
and shall be rated for continuous operation at the maximum ambient temperature specified and
encountered in Kuwait (55oC).
F.4.2 The Busbars shall be hard drawn high conductivity copper of 99.9 % purity, shall be of sandwich
construction and all insulated. The material used for insulation shall conform to Class „H‟ or „F‟
and it shall be fully suitable to prevent moisture that reduces dielectric strength of the insulation
and to provide safety against flame propagation and fire hazards . Insulation by means of PVC
tape or sleeve, paper, polyester sheet and derivatives or any other flammable material is not
acceptable. All contact surfaces including joints of the busbars shall be silver or tin plated.
F.4.3 The Busbars shall be housed in a totally enclosed duct, vermin proof enclosure made of painted
zinc coated sheet steel or extruded aluminium.
F.4.4 Joints shall be accomplished by means of an insulated bolt passing through the conductors. Joint
bolt shall provide an easily detected visual indication that the bolt has been tightened. Inspection
plates shall be provided to permit periodic joint examination without disturbing joint pressure.·
F.4.5 The enclosure shall be constructed to withstand the electro-mechanical forces that may be induced
by the prospective short circuit current.
F.4.6 Each length of Busbar shall provide tap-off positions at different intervals not exceeding 5ft. and
shall be so designed that each length of the Busbar is free to expand and contract without
detriment to itself or to adjacent part of installation.
F.4.7 Tap-off boxes shall be constructed of sheet steel and complete with securing devices to insure
rigid connection to the Busbar.
F.4.8 Tap-off boxes shall in corporate a moulded case circuit breaker or fused switch. They shall be of
the type which can be plugged in to the Busbar when it is live.
F.4.9 Tap-off units shall be mechanically interlocked with Busbar housing to prevent removal of the
plug-in units while the switch is in the ON position. Covers should be provided with rel easable
type interlocks to prevent the cover from being opened while the switch is in the ON position.
F.4.10 The operating handle shall retain control of the switching mechanism at all times, and shall be
padlockable.
F.4.11 Tap off units shall be equipped with an indicator flag to indicate the "ON" or "OFF" position
of the switching mechanism.
F.4.12 Blanking plates shall be fitted to all tap off positions that are not fitted with tap off units.
F.4.13 The Busbar trunking shall be provided with fire barrier whenever the Busbar trunking passes
through a fire compartment barrier or through walls or floors.
F.4.14 A suitable weather proof fitting must be provided where Busbar trunking passes through a roof.
F.4.15 A dead end of bus way shall be closed.
F.4.16 For long busbar run, phase transposition of busbar shall be incorporated in accordance with
manufacturer‟s recommendation.
33
F.5 EARTH ELECTRODES:
Earth electrode shall comprise of 3 sections, each section to be 1200 mm long and 16 mm
diameter. The electrode rod shall be made of high strength steel with copper for non -rusting. The
copper shall be molten welded, the steel core for laminating electrolytic action. The radial copper
coating shall be minimum 250 microns with 99.9% copper content. One end of the rod shall be
pointed without application of heat and driving head shall be provided at the other end. The
sectional rods shall be coupled with strong bronze couplers. The coupler shall be threaded to fit
the rod section. The rod shall be driven into the earth by means of a power hammer. Clamps shall
be provided for connecting external copper strips to the electrode , the clamps shall be of
adequate size to take 25 X 3 mm strips.
F.6 SUBMITTALS:
The Contractor shall submit before ordering f ull technical details and manufacturer catalogues of
the proposed trunking and accessories for approval.
F.7 CABLE TRAYS AND RACKS:
F.7.1 Cable trays shall generally consist of sheet metal or steel profiles being of the ladder or the
perforated channel type with a maximum width of 600mm and a supporting distance not
exceeding 1500mm.
F.7.2 Cable trays of the ladder type shall consist of metal profiles riveted together having horizontal
spacing's between two rounds not exceeding 300mm.
F.7.3 Cable tray of the ladder type shall have a minimum carrying capacity of 200 Kg/m and under
normal conditions the sag is not to exceed 3mm.
F.7.4 The cable trays shall be part of a module system having available all required accessories and
transition pieces from one to another direction or elevation.
F.7.5 All bolts and screws shall be cadmium-plated or electrolytically galvanized.
F.7.6 Every cable tray shall be marked at both ends and at intervals of 20m.with the pertaining
registration number.
F.7.7 Cover or sunshades shall be provided where trays are exposed to the sun.
F.7.8 The metal thickness of perforated channel cable tray shall not be less than 1.6 mm (6G) before
galvanizing and vertical stem shall have a minimum height of 45 mm with return flange.
F.7.9 Cable trays arranged one above the other shall have spacing in relation to their width not
exceeding a ratio of 1:2 with a minimum distance of 150mm.
F.7.10 All trays, supporting steel members, clamps and other accessories shall be of one manufacturer
and shall be hot-dipped galvanized after fabrication.
34
F.1. STANDARDS:
Cable trunking and Bus -bar trunking shall comply with the following standards as
appropriate:-
F.2 STEEL CABLE TRUNKING:
F.2.1 Steel cable trunking shall be made of painted zinc coated steel.
F.2.2 The cable trunking shall have inward turned flanges on the body for strengthening.
F.2.3 The cable trunking shall be complete with easily fitted covers which are locked in place by flush
pattern turn button.
F.2.4 Standard trunking accessories: Tees, angle tees, four way through boxes, off sets , etc., shall be
used. These accessories shall be made by the same steel trunking manufacturers.
F.2.5 Each length of the cable trunking and accessories shall be complete with coupling and earth
copper links.
F.3 NON-METALLIC CABLE TRUNKING:
F.3.1 Non-Metallic cable trunking and its accessories shall be made from high impact non- combustible
polyvinyl-chloride with precise extruded section suitable for use a thigh temperature.
F.3.2 All cable trunking shall be provided with removable covers. Cover shall be maximum 1.5 metre
in length.
32
BS EN 50085-1
Cable trunking systems and cable ducting systems for
electrical installations - General requirements
BS EN 50 085-2
Cable trunking systems and cable ducting systems for
electrical installations - Cable trunking systems and cable
ducting systems intended for mounting on walls and
ceilings
BS 4678-2 Cable trunking - Steel under floor (duct) trunking
IEC/BS EN 61439-1
Low-voltage switchgear and controlgear assemblies –
Part 1: General rules
IEC/BS EN 61439-6 Low-voltage switchgear and controlgear assemblies –
Part 6: Busbar trunking systems (busways)
BS EN 10346
Continuously hot-dip coated steel flat products. Technical
delivery conditions
F.4 BUSBAR TRUNKING:
F.4.1 The Busbar trunking shall be three phase and neutral. Rating shall be as indicated on the
drawings. The trunking system shall be designed, manufactured and type tested to IEC 61439-6,
and shall be rated for continuous operation at the maximum ambient temperature specified and
encountered in Kuwait (55oC).
F.4.2 The Busbars shall be hard drawn high conductivity copper of 99.9 % purity, shall be of sandwich
construction and all insulated. The material used for insulation shall conform to Class „H‟ or „F‟
and it shall be fully suitable to prevent moisture that reduces dielectric strength of the insulation
and to provide safety against flame propagation and fire hazards . Insulation by means of PVC
tape or sleeve, paper, polyester sheet and derivatives or any other flammable material is not
acceptable. All contact surfaces including joints of the busbars shall be silver or tin plated.
F.4.3 The Busbars shall be housed in a totally enclosed duct, vermin proof enclosure made of painted
zinc coated sheet steel or extruded aluminium.
F.4.4 Joints shall be accomplished by means of an insulated bolt passing through the conductors. Joint
bolt shall provide an easily detected visual indication that the bolt has been tightened. Inspection
plates shall be provided to permit periodic joint examination without disturbing joint pressure.·
F.4.5 The enclosure shall be constructed to withstand the electro-mechanical forces that may be induced
by the prospective short circuit current.
F.4.6 Each length of Busbar shall provide tap-off positions at different intervals not exceeding 5ft. and
shall be so designed that each length of the Busbar is free to expand and contract without
detriment to itself or to adjacent part of installation.
F.4.7 Tap-off boxes shall be constructed of sheet steel and complete with securing devices to insure
rigid connection to the Busbar.
F.4.8 Tap-off boxes shall in corporate a moulded case circuit breaker or fused switch. They shall be of
the type which can be plugged in to the Busbar when it is live.
F.4.9 Tap-off units shall be mechanically interlocked with Busbar housing to prevent removal of the
plug-in units while the switch is in the ON position. Covers should be provided with rel easable
type interlocks to prevent the cover from being opened while the switch is in the ON position.
F.4.10 The operating handle shall retain control of the switching mechanism at all times, and shall be
padlockable.
F.4.11 Tap off units shall be equipped with an indicator flag to indicate the "ON" or "OFF" position
of the switching mechanism.
F.4.12 Blanking plates shall be fitted to all tap off positions that are not fitted with tap off units.
F.4.13 The Busbar trunking shall be provided with fire barrier whenever the Busbar trunking passes
through a fire compartment barrier or through walls or floors.
F.4.14 A suitable weather proof fitting must be provided where Busbar trunking passes through a roof.
F.4.15 A dead end of bus way shall be closed.
F.4.16 For long busbar run, phase transposition of busbar shall be incorporated in accordance with
manufacturer‟s recommendation.
33
F.5 EARTH ELECTRODES:
Earth electrode shall comprise of 3 sections, each section to be 1200 mm long and 16 mm
diameter. The electrode rod shall be made of high strength steel with copper for non -rusting. The
copper shall be molten welded, the steel core for laminating electrolytic action. The radial copper
coating shall be minimum 250 microns with 99.9% copper content. One end of the rod shall be
pointed without application of heat and driving head shall be provided at the other end. The
sectional rods shall be coupled with strong bronze couplers. The coupler shall be threaded to fit
the rod section. The rod shall be driven into the earth by means of a power hammer. Clamps shall
be provided for connecting external copper strips to the electrode , the clamps shall be of
adequate size to take 25 X 3 mm strips.
F.6 SUBMITTALS:
The Contractor shall submit before ordering f ull technical details and manufacturer catalogues of
the proposed trunking and accessories for approval.
F.7 CABLE TRAYS AND RACKS:
F.7.1 Cable trays shall generally consist of sheet metal or steel profiles being of the ladder or the
perforated channel type with a maximum width of 600mm and a supporting distance not
exceeding 1500mm.
F.7.2 Cable trays of the ladder type shall consist of metal profiles riveted together having horizontal
spacing's between two rounds not exceeding 300mm.
F.7.3 Cable tray of the ladder type shall have a minimum carrying capacity of 200 Kg/m and under
normal conditions the sag is not to exceed 3mm.
F.7.4 The cable trays shall be part of a module system having available all required accessories and
transition pieces from one to another direction or elevation.
F.7.5 All bolts and screws shall be cadmium-plated or electrolytically galvanized.
F.7.6 Every cable tray shall be marked at both ends and at intervals of 20m.with the pertaining
registration number.
F.7.7 Cover or sunshades shall be provided where trays are exposed to the sun.
F.7.8 The metal thickness of perforated channel cable tray shall not be less than 1.6 mm (6G) before
galvanizing and vertical stem shall have a minimum height of 45 mm with return flange.
F.7.9 Cable trays arranged one above the other shall have spacing in relation to their width not
exceeding a ratio of 1:2 with a minimum distance of 150mm.
F.7.10 All trays, supporting steel members, clamps and other accessories shall be of one manufacturer
and shall be hot-dipped galvanized after fabrication.
34