Electric Wiring, 3rd Edition

128 Installation of conduit systems

Fig.

8.14. A serrated conduit coupling for use with a smooth-bore brass bush {Walsall

Conduits)

of branches. A PVC junction box, for example, breaks continuity, and it is

much easier to use a metal box than to connect effectively the conduits

feeding a PVC box.

Where connections are made to boxes that have enamelled finishes, for

example, the enamel must be removed at the point of conduit entry. The

serrated conduit coupling shown in Fig. 8.14 will greatly assist in main-

taining good continuity at switch-boxes, etc.

Where conduits are terminated in switchfuses or metalclad consumer units

an earth termina