Standard Wiring Trunking Sample Clauses

Standard Wiring Trunking. Wiring trunking and accessories shall be fabricated from folded or cold-rolled sheet steel. All bends, tees, stop-ends etc., shall be supplied by the trunking manufacturer. No accessory shall be made up where a manufactured accessory is available. Any made up accessories shall be neatly fabricated and shall be brazed or strongly pop-riveted at joining edges. Accessories and sections of trunking shall be coupled with coupling pieces and earth bonded together with copper bonding links. In addition, the links shall be bonded to the trunking main earth or largest circuit earth wire with a jumper of at least 2,5mm². The maximum number of circuit and earth wires that may be installed into any trunking shall be such that the total overall cross-sectional area of the wiring including the insulation does not exceed 45% of the free area of the trunking. With the exception of under floor trunking and loosely filled “opening-up” trunking, wiring retainers shall be installed every meter of run and at other positions as required. The trunking shall be installed in a neat and workmanlike manner on ceilings, walls, plant machinery etc., as indicated in the drawings. All standard trunking used in industrial applications shall be finished in the colour code appropriate to the service (refer to 12.7.4 (e)). Where channel passes through a “fire-wall” the channel lid shall be cut 100mm either side of the penetration and the wall entry around the channel shall be sealed by the building contractor. The Contractor shall supply and install suitable fire-barriers inside the channel. These shall consist of intumescent or other approved fire resistant material, as supplied by PH Protection Plaster Systems (Pty) Ltd of Johannesburg, Pyro-Cote cc of Durban, or equal and approved and installed in accordance with the supplier’s recommendations.
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