By A. J. Coker
Commonly used by means of electric engineers, contractors and wiremen, this handbook is usually worthy for others who're interested in family electric install - together with heating engineers, architects and upkeep employees
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PVC-SHEATHED TWIN AND EARTH CABLE Fig. 8. Fitting an all-insulated surface switch. An earth terminal should be provided and connected to the protective conductor, which should be covered with an insulating sleeve 38 Domestic installation practice Surface switches This type of switch is normally employed with surface wiring and may be mounted on a moulded pattress block or in a metal or insulated box with knockouts for cable entry (Fig. 8). Moulded and metal boxes are available which enable the square or rectangular flush-type switches to be surface mounted.
G. g. silicone-bonded glass braiding. The current ratings and correction factors for various ambient temperatures for flexible cables and cords of various types are given in the IEE Regulations (see also page 49). T w o - w a y switch control Two-way switching (as explained in Chapter 1) is often useful in bedrooms, halls and landings and rooms with two doors. A typical arrangement is P N CPC THREE-CORE CABLE AND CPC Fig. 7. Two-way lighting 44 Wiring lighting points shown in Fig. 7; this is an alternative to Fig.
Typical ground-floor lighting circuit using an all-insulated wiring system and fourterminal ceiling roses An earth terminal must now be provided at all lighting points and connected to the protective conductor of the final circuit. , PVC-insulated and sheathed or mineral insulated). Connectors in boxes can also be used with conduit systems to save cables in looping back. The layout of lighting points using the jointing principle is illustrated in Figs. 6. Junction boxes may give a saving in cable but, in general, all joints should /4-WAY JUNCTION BOXES TWIN-AND-EARTHCABLE rftfr VSEi EARTHING TERMINALS AT SWITCHES f£tl ££J Fig.