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Figure 3: Typical
backup wiring using 1
(1) Channel 1 alert audio IN from the audio source output
(2) EVAC audio IN from the audio source output
(3) SLC IN from previous device or control panel
(4) End-of-line resistor (EOLR)
(5) SLC OUT
(6) Auxiliary power
(7) Ground shield, if required
P/N 387343-ML • REV 08 • ISS 13MAR17
VRMS
(8) 47 kΩ temporary resistor (not an end-of-line resistor) used to test the
(9) Audio riser out to the first riser selector on the audio riser. If the audio
(10) Audio riser return from last riser selector on the audio riser. Required
(11) Alert and emergency voice/alarm communication amplifier
(12) Backup amplifier
audio. After test, replace with a UL/ULC Listed 47 kΩ EOL.
riser is wired Class B, install a 47 kΩ EOLR.
only if the audio riser is wired Class A.
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