October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Fluorescent-tube lighting 57
FUSE |
?
1
L
CONTROL UNIT
> 'AM/Mflfl^
L
noononno
~~\JouUouUfll/
II
II
T
2
1
R.I.S.
CIRCUIT
CAPACITOR
"~^ TUBE &"
Fig.
4.18. A semi-resonant start circuit. The earthed metalwork must be within 12 mm of
the tube
tube arc has struck, the current in the primary winding builds up in the same
way as a choke, and the voltage across the primary winding is about 190 V
when the tube current is stabilised,.
To protect the semi-resonant-start circuit against overheating of
the
ballast
windings due to capacitor failure, an external h.b.c. cartridge fuse
(usually 1A) is provided in the supply terminal block or in a separate
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