October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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58 Wiring lighting points
should be used. The ballast resistance may be in the form of a special
tungsten-filament lamp, or a wire resistor. Fig. 4.20 shows the circuit for a
QP NO
AD
QS TUBE & r
EARTHED CHASSIS 1,
4-PIN SWITCH
AND SOCKET
Fig.
4.20. A filament ballast lamp used with a giowswitch starter
fitting incorporating a special combined starter-ballast lamp; the filament
ballast lamp is cemented into the end of a standard four-pin starter canister.
The ballast lamp is connected across terminals D and B whilst the giowswitch
starter is across A and C. The filament ballast lamp therefore takes the place
of the normal choke and p.f. capacitor ...
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