Electrical Installations and Regulations by Michael Neidle (auth.)

By Michael Neidle (auth.)

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Wiring Regulations which relate to the use of PVC-sheathed cables. 11. An installation employs sheathed cables with overall diameters of 7, 12 and 32 mm. State the minimum radius of bend for each of the cable sizes. 12. Describe what precautions should be taken and the method of installation which should be used, in the installation of cables in each of the following instances. Use sketches to illustrate your answers. (a) PVC-insulated and sheathed cables run at right-angles to timber joists over the ground floor ceiling in a modern house.

A surge diverter consists of a nonlinear resistor which acts as a shunt to any surge voltage. The diverter has the peculiar property of being almost nonconductive at normal mains voltage, but becomes increasingly more conductive with a rise in voltage. It may also be advisable to fit surge diverters to inductive contactor coils that are subject to rapid or frequent operations. 7 EARTH CONCENTRIC WIRING This comes under the heading of Protective Multiple Earthing (PME) and requires a Form of Approval from the Department of Trade and Industry.

By a wedge and stub crimping tool the pot shell is drawn tightly over the wedge. Loose powder is then tapped out of the pot, after which the pot is filled with compound from one side only. 2 Wedge pot-seal When filling is completed, the crimper stub cap is pressed into the mouth of the pot. The wedge part of the tool is now used to crimp the stub cap firmly to the pot shell. For an earth tail, the wedge should be rotated until the earth wire lines up with one of the cap stubs. If a gland is required, then the necessary end is threaded over the cable prior to fitting on the pot.

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