37
Field wiring
Table 5 RS-485 Wiring to Annunciators and other Devices
7.8 Four-Wire Smoke Power
4-wire smoke power is provided for 4-wire smoke detectors. This filtered supply is supervised
therefore a short disconnects the power through the relay until the SYSTEM RESET button is
pressed. This supply is rated at 22.3VDC Nominal/300mA max/1V voltage drop maximum.
7.9 Supervised Auxiliary Power
Supervised auxiliary power is used to power the remote annunciators and smart relay
modules. This filtered circuit is supervised therefore a short disconnects the power through the
relay until the SYSTEM RESET button is pressed. This supply is rated at 22.3VDC Nominal/
500mA max/1V voltage drop maximum.
7.10 Auxiliary Power
This special application supply is not supervised. This supply is rated at 24VDC Nominal/1.7A
max. If there is a short on this circuit, the auxiliary power does not recover automatically when
the short is removed. The main power must be disconnected, then reconnected and the panel
reset to re-establish the auxiliary power supply. See Appendix E: Auxiliary Devices on
page 101.
Wire gauge Maximum wiring run to last device
AWG Feet Meters
22 2000 609.6
20 4000 1219.2
18 8000 2438.4
Notes: Use twisted shielded pair,
300mA power limited.
Maximum 40 ohm loop resistance
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