
Section 15 – External Sounders
15-3
Wiring the Alarm Output
UL985 Household Fire or Combination Household Fire/Burglary Installations
For installations, which must provide UL Listed protection, the total current drawn from the
alarm output, auxiliary power output, and polling loop combined, must not exceed 750mA in
order to comply with the battery independence requirements. If, for example, two System
Sensor PA400 piezo alarm sounders, wired in parallel, are used (24mA total), then 726mA
(750mA – 24mA) is available for auxiliary output and polling loop use.
Wire polarized fire-indicating devices to the alarm output as shown in Figure 15-1.
+
-
12345678
ALARM SOUNDER OUTPUT 10VDC - 13.8VDC
1.7A maximum
+
-
BELL
HORN
Figure 15-1: Wiring Polarized Fire Indicating Devices
UL1023 Household Burglary Installations
For household burglary installations the total current drawn from the alarm output must not
exceed 1.7A. A battery must be installed since the combined auxiliary power, polling loop,
and alarm output, in excess of 750mA must be supplied by the battery.
Wire nonpolarized burglary indicating devices to the alarm output using a polarizing diode
as shown in Figure 15-2.
PANEL BELL
PANEL BELL
+
-
BELL
BELL
}
HORN
NON- POLARIZED BURGLARY
INDICATING DEVICES
POLARIZED FIRE
INDICATING DEVICE
TO OTHER
DEVICES
POLARIZING DIODES
(MUST MOUNT AT INDICATING DEVICE)
Figure 15-2: Wiring Nonpolarized Burglary Indicating Devices
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