October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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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. 3.8).
Moulded and metal boxes are available which enable the square or
rectangular flush-type switches to be surface mounted. Many manufacturers
make boxes which are suitable for either surface or flush mounting.
The appropriate knockouts should be removed from metal boxes and
either a rubber grommet fitted for surface wiring or brass bush and collar for
conduit. Moulded or metal boxes are suitable for PVC-insulated surfac ...
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