Trunking is also painted to match the decor and provide a quick, decorative, efficient way to comply with modem-day requirements for convenience outlets located throughout the facility. Surface metal trunking must be of such construction as to distinguish them from other raceways.
Their elbows, couplings and other similar fittings shall be designed so that the sections can be electrically and mechanically coupled together. In multistory buildings trunking of suitable capacity .and with the necessary number of compartment is usually provided.
In trunking system the telecommunications companies to insist that their cables are completely segregated from all other wiring system. Therefore, for this purpose, install 3 or 4 compartment trunking. Cables feeding emergency; lighting and fire alarms must be segregated from the wiring of any other circuits.
Many reputable manufacturers can now supply trunking ranging from 1.5 x 1.5 inch to 4 x 9 inch or even larger, with two or more compartments.
Trunking is available in length of 6-ft to 8-ft where there are vertical runs of cables in trunking, then pin racks should be fitted inside the trunking to support the weight of these cables.
These pin racks consist of steel pins, sheathed by an insulating material and fitted at intervals of Sm. Where vertical trunking passes through floors it must be provided with internal fire barriers. These fires barriers consist of nonflammable materials. When large cable are installed in trunking care must be taken to ensure that all cables are of sufficient radius to avoid damaging. In this system P.V.C / V.I.R cables are commonly used.
For plumbers in Minnesota that have always installed soft copper and are comfortable doing it, Serious Electricians
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What is a different between conduit wiring and trunking wiring system
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