Electric Wiring, 3rd Edition

124 Installation of conduit systems

looping-box system are shown in Fig. 8.8. Looping boxes are available with

two to four holes at the back, by which the conduit can be teed off to other

points as required.

The conduit may be fixed to the box by means of a socket at the back and

hexagon brass bush inside, or by means of a locknut and a brass tube end. A

collar extension piece or ring on the box enables it to be deepened as required

to be level with the plaster surface.

To fit the looping boxes shown in Fig. 8.8, special tools have been designed

and these are illustrated in Fig. 8.9. The hexagon bush may be tightened with

Fig.

8.9. Special