October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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11
0 Survey of modern wiring systems
(b) are dimensionally stable and non-ageing;
(c) do not deteriorate significantly after long external exposure;
(d) will not support combustion;
(e) are not susceptible to water condensation; and
(0 have excellent electrical properties (breakdown voltage is often 12-20
kV/mm.
There are several manufacturers producing non-metallic conduit. Most
employ PVC (polyvinyl-chloride) compounds for conduit and fittings. Two
distinct types are available — rigid and flexible.
Rigid conduit
The most commonly used type of rigid conduit is made of 'unplasticised'
PVC in accordance with BS 4607, and is obtainable in outsid ...
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