October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Rising mains
1
47
Where cables are installed in vertical enclosures, internal barriers are
required at not more than
5
m centres to prevent excessive temperature rise at
the top of the enclosure.
Fire barriers are also necessary at all floor levels in accordance with IEE
Regulation 527-02-01. The enclosure should be adequately ventilated as
necessary, particularly at the top.
The connections to the rising mains for the individual sub-circuits are made
at each floor, the actual method depending on the system employed for the
rising mains and the method of sub-distribution.
Busbar system
Rising main busbar systems consist of bare or lightly insulate ...
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