Design of Electrical Services for Buildings (1998) by B. Ribgy

By B. Ribgy

Electric prone are a necessary and dear part in any smooth construction. it truly is crucial that development execs comprehend the fundamental rules of companies layout. For the hot version of this good verified booklet the writer presents a simple grounding within the layout of electric prone. all through, the emphasis is at the wishes of the layout engineer and the e-book describes equipment of layout with examples of calculations and methods of set up.

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34 Conduit coupling 48 Wiring Fig. 35 Conduit entries into boxes screwed connection is relied on for continuity of the earth path and the lock nut is essential to prevent the socket working its way along the threads until it engages more on one conduit than on the other. The reason for wanting an earth path is discussed in Chaper 9. Methods of joining conduit to boxes of the kind described in Chapter 1 are shown in Fig. 35. A bush of some sort must always be used to provide a smooth entry into the box and to avoid sharp corners which could damage the cable insulation.

21 22 Accessories Fig. A. Crabtree & Co. ) useful with some modern building methods in which the wiring is installed in a special skirting. The skirting is at floor level, but this is too low for socket outlets and the latter are, therefore, a little above the skirting so that at each outlet cables have to rise a small vertical distance. The pattress shown provides a neat and convenient way of doing this. It has also been known to happen that in the course of erection of a new building an electrical outlet is wrongly placed.

A braid or tape of glass-silicone rubber will hold it, and cable made with this construction is very useful for fire alarms. Insulation 35 Glass Glass fibre has good heat resisting properties and is therefore used for cables which are employed in high temperature surroundings. One example is the internal wiring of electric ovens. Another application which may not at first sight seem to require heat-resisting cable lies in flexible cords for light fittings. Although the object of an electric lamp is to convert electrical energy into light, most of the energy is in fact dissipated as heat.

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