Electric Wiring, 3rd Edition

PVC-sheathed wiring 1 37

Fig.

9.2. (a) Surface mounted twin socket with mounting block

(b) Moulded box for surface mounting of flush type twin socket

(MK Electric Limited)

Alternatively, by using a shallow box for switches and a deeper box for

socket-outlets, the same fittings that are normally used for flush mounting

can be installed on the surface. These boxes are screwed to the wall and the

fittings attached by metal threaded screws into tapped fixing lugs on the box

(see Fig. 9.2).

Where the sheathing of the cable is cut back to make the connection to an

accessory or fitting, all unsheathed portions of cable must be completely

enclosed