October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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22 Installation of conduit systems
between the plaster and the box to be effectively concealed. In place of iron,
fibre covers are sometimes used; these enable fittings such as switches or
ceiling roses to be screwed to them.
Another type of cover is made of cast iron and is thicker than the sheet iron
variety. It has one face machined smooth. The round box used with this type
has its rim machined also, and when in position the joint is practically
watertight. As an extra precaution a rubber or fibre gasket may be inserted
between the surfaces.
Other types of boxes, employed solely for housing switches, socket-
outlets, connection units, etc. ...
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