BB تركيب الإضاءة

BB.
BB.1

BB.2



BB.3
For nonmetallic conduit all the joints shall be made with proprietary fittings and an approved adhesive. The
conduits and fittings shall be entirely suitable for the environment and the temperature range that will be met in
service. The installation shall cater for the differential expansion and contraction that will occur between the
conduit and the structure to which it is attached.

Where flexible conduits are installed a separate earth conductor shall be provided and under no circumstances
shall the flexible tubing be used for earthing.

The trunking shall be attached to the building frame work and walls or supported on hanger or brackets as
appropriate.

All trunkings shall be free from rust patches or mechanical damage. All abrasions on metallic trunking shall be
painted with two coats of an approved metallic paint immediately the trunking has been installed. Damaged
trunking shall be replaced to the satisfaction of the Engineer.

Where trunking passes through ceiling and walls the cover shall be firmly fixed at150mm either side in ceilings
and floors and 250mm either side of walls. Approved fire resisting Internal barriers and external seals shall be
provided to prevent the spread of fire through floors and walls, and ceilings.

Where trunking crosses a building expansion joint flexible connections shall be provided. In addition us
allowance shall be made for thermal expansion.

Cable trunking where specified or where offered instead of or in addition to conduit shall be complete with all
the necessary proprietary bends, tees, sets, angles, cable restraining straps, covers and other accessories.

Cables shall not be installed in trunking until the section is complete. Each group of cables comprising a circuit
shall be secured at 300 mm intervals with approved type, nonmetallic buckles. The circuit reference of each
group shall be identified with an approved type of label, spaced at 1800mm intervals on straight runs, and
150mm back from all tees and bends.

For non-metallic cable trunking all joints between sections of the trunking shall be made with a connecting
sleeve. Clip in metal or PVC partitions shall be provided where compartmented cable trunking is required. The
partitions shall be of steel when screening and segregating mixed services. The installation shall cater for the
differential expansion and contraction that will occur between the trunking and the structure to which it is
attached. Adequate supports shall be provided to prevent any visible sagging of the trunking run.

Light Fittings:

Pendant fitting switch sphere shall be suspended by means of their standard manufacturer's suspension with ball
swing joint.

Pendant fluorescent fittings shall be suspended by means of two numbers of heavy gauge galvanized steel
conduits and two numbers of ball dome covers.

For light fittings fixed directly to the boxes, sufficient long sleeve of suitable heat resisting material e .g.,
Silicone bonded glass braiding shall be provided at the end of each conductor of the fixed wiring.









83