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11 Devices
All field devices shall be of an approved type and installed in accordance with the manufacturers
specifications.
Field devices are considered to be:
➢ Speakers
➢ Visual Warning Devices
➢ WIP's
➢ EAID's
11.1 Speakers
All speakers are to be fitted with a 100V line transformer and DC isolation capacitor. Use only Ampac
recommended speakers. See Appendix D for a list of compatible devices.
The speaker at the end of a speaker circuit shall be terminated with a 47KΩ resistor where the
outgoing 100V Line would normally terminate.
Incoming 100V Line A
Outgoing 100V Line A
Incoming 100V Line B
Outgoing 100V Line B
* Place 47K Resistor Across
Outgoing Line Terminals
Of Last Speaker
To Speaker
Transformer
To Speaker
Transformer
Figure 23: Typical Speaker Connection
MAN1813-9
Capacitor
38
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