October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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OPERATING
DOLLY
Fig.
2.2. Miniature circuit-breaker (Crabtree Electrical Industries)
fuses,
and the over-current protection provided may allow economies in cable
sizes.
Also, they do not 'age' in service and since their settings cannot be
altered, the risk of over-loading of circuits due to unqualified persons
operating them is completely removed.
When a circuit-breaker operates, or 'trips', a visual indication is
immediately given since the switch dolly moves automatically to the off
position. Once the fault has been traced and rectified or isolated, the circuit-
breaker can simply be switched on again. Even if the circuit-breaker is close
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