Where a large number of cables has to be run together , it is often convenient to put them in trunking . Trunking for electrical purposes is made of 18-gauge sheet steel , and is available in sizes ranging fronm 50mm x 50mm , 75mm x 100mm , 150mm x 75mm and 150mm x 150mm although 50mm x100mm and 100mm x 100mm ar also availabl . It is usually supplied in 2m lengths and one complete side is removable , as shown in Figure 3.15 . The removabe side , or lid , either screws on or clops on with a snap action . The latter arrangement is cheaper but a little more awkward to handle .
A variety of bends , tees and junctions is available from all manufacturers of such trunking . SOme of these are shown in Figure 3.15 They enable the trunking to be taken round corners , to reduce in size as the number of cables is reduced and to allow a main run to serve a number of branches .
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