Electric Wiring. Domestic by A. J. Coker

By A. J. Coker

Known by means of electric engineers, contractors and wiremen, this handbook is usually necessary for others who're fascinated about family electric set up - together with heating engineers, architects and upkeep employees

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Fig. 3 shows a typical layout in a small house using the looping principle with four-terminal ceiling roses. Only one circuit is shown for clarity; it has been assumed that the ground floor will be on a separate circuit to the first floor. It should be noted that the 'go' and 'return' cables must always be run in the same conduit, including wiring to two-way switches. -SHEATHED CABLE EARTH TERMINAL X SWITCH WIRE TERMINAL FOUR-TERMINAL CEILING ROSES NEUTRAL LOOP-IN TERMINAL HEAT-RESISTING FLEXIBLE CORD AND LAMPH0LDER RED SLEEVING ON SWITCH WIRE ENDS RED CORES BLACK CORES BARE PROTECTIVE CONDUCTOR (WITH INSULATING GREEN/YELLOW SLEEVING IN CEILING ROSES AND SWITCHES) SINGLE POLE SWITCH Fig.

These units provide an earth-free supply via an isolating transformer and include protection against overload.

Connecting a light pendant to a ceiling rose Heat-resisting flexible cords should be used for connecting the lampholder to the ceiling rose (see 'Cables for Lighting' page 43). The sheathing on the flexible cord is cut back for approximately 40 mm and the insulation removed for approximately 10 mm. The two cores of the cord are then passed round or through, or arranged to be held by, the cordgrip device in the ceiling rose and the bared ends connected into the two appropriate terminal blocks. Care must be taken to ensure that the flexible cord is connected to the neutral and switch-wire terminals.

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