October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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52 Wiring lighting points
by a push bar which passes through the case of
the
lampholder. Such switched
landholders are often fitted to standard and table lamps. However, they
must not take the place of
a
wall switch or socket-outlet to control the circuit
completely, and must not be used in bathrooms.
Fluorescent-tube lighting
The three most important features of low-pressure mercury fluorescent-tube
lighting may be summarised as follows:
1 Lighting efficiency is very much higher than that of metal-filament
lamps. For example, one 85 W 'natural' fluorescent lamp gives almost
as much light as four 100 W metal-filament lamps; and one 85 W
'war ...
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