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Modern Electrical Installation for Craft Students, 3rd Edition
book

Modern Electrical Installation for Craft Students, 3rd Edition

by Brian Scaddan
November 2013
Intermediate to advanced content levelIntermediate to advanced
182 pages
6h 6m
English
Newnes
Content preview from Modern Electrical Installation for Craft Students, 3rd Edition
64 Cells, batteries and transformers
τ
Push to make
button
Switch
[—° Β οι
V"o
3
1 ο C
c^ii-
12
ν
ο ;
^Switch
Battery
b
\ G>
N/0
Relay
coil
410
Relay
base
-o ö
Push
button
Diagram 76 (a) Simple 'hold-on' circuit; (b) wiring diagram
closing
S
again would not re-energize the relay. Button Β would need to
be pushed again to re-energize the relay.
Bell
and call systems
These systems and variations of them are widely used in hotels and
hospitals. Diagram 77 shows a basic system.
When a remote push button is operated, its associated relay is
energized and an indicator flag drops into a window in the indicator
board. As the bell is in series with al ...
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Publisher Resources

ISBN: 9781483106205