By B. Ribgy
Electric providers are an important and dear part in any sleek construction. it's crucial that building execs comprehend the elemental ideas of providers layout. For the recent variation of this good confirmed booklet the writer offers a easy grounding within the layout of electric prone. all through, the emphasis is at the wishes of the layout engineer and the booklet describes tools of layout with examples of calculations and methods of deploy.
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Extra info for Design of Electrical Services for Buildings (1998)
30 Circular flex make a twisted twin flex. Circular flex is made for the connections to household appliances such as irons, kettles and so on, and consists of rubber insulated cable inside an external cotton braiding. Either two or three rubber insulated cables may be used and to obtain the circular cross section cotton padding is wound round them inside the outer braiding. This is illustrated in Fig. 30. There are also flexible cords made with silicone rubber insulation with a covering of braided varnished glass fibre.
36. The use of bends and inspection covers is not, however, regarded as good practice, because they provide inadequate room for drawing in cable and because they look unsightly when the installation is completed. Heavy gauge conduit is thick enough for the cross sectional area of the metal to provide a good earth continuity path. The conduit can, therefore, be used as the earth conductor and no separate cable or wire need be used for this purpose. When this is done, it is essential that the conduit with all its fittings and screwed joints should form a continuous conducting path of low impedance and the safety of the installation depends on good electrical contact at all the joints.
Hazardous Areas 25 illustrated in Fig. 22. It consists of two screw-down-type terminals solidly connected to each other, mounted in an insulated casing. The end of each wire is pushed into one of the terminals and the screw is tightened on to it. The screw grips the cable, holding it firmly in place and at the same time making a good electrical contact. As the two terminals are solidly connected within the insulated case, the result is that there is a good electrical path between the two cables.