GLOSSARY
SYMBOLS
W
Indicates a ground terminal
A
AHJ
Authority Having Jurisdiction. The government body, organization, office, or individual hav-
ing the power to enforce and/or interpret laws, codes, and rules.
Ancillary Device
A device connected to a fire alarm system not required by the fire alarm standard, but may
be required by other standards, e.g. door holders, smoke control fans, remote LED indic-
ators, remote alarm, or trouble units.
AWG
American Wire Gauge. The standard American designation of wire sizes. Wire size is an
inverse relation to gauge numbers that range from 0000 to 40 AWG. Also called Brown and
Sharpe or B&S gauge.
C
Class A
A wiring classification of circuits capable of transmitting an alarm signal during a single
open or non-simultaneous ground fault on a conductor.
Class B
A wiring classification of circuits NOT capable of ransmitting an alarm signal beyond a
single open or during a short between conductors.
Glossary
SHIELD Fire, Safety & Security Ltd
Aura Fire Alarm Control Panel Installation Manual
Version 1.00 |June 2019 |MAN-1431VS
Page 147
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