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2.0 GENERAL NOTES and DEFINITIONS
Circuits and Zones:
“Circuits”
refers to an actual electrical interface,
Initiating
(Detection),
Indicating
(Notification), or
Relay
.
“Zone”
is a logical concept for a Fire Alarm Protected Area, and will consist of at least one Circuit.
Often the terms Zone and Circuit are used interchangeably, but in this Manual the term Circuit is used.
Terminology:
“Indicating Circuits”
are also know as Notification Appliance Circuits, Signal Circuits and Bell Circuits.
Wiring Styles:
Initiating Circuits
are configured by default as Class B (Style B). They may be GLOBALLY (all or none) configured
as Class A (Style D) as described in the Configuration Section. This operation uses odd and even pairs of two-wire
Class B (Style B) circuits to make one four-wire Class A (Style D) circuit, thus halving the number of available
Initiating Circuits.
Indicating Circuits
may be individually wired as Class A (Style Z) or Class B (Style Y) without affecting the number
of circuits available (see Module wiring instructions).
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