Edwards 3-ZA20A

Installation Sheet 27JUN07 P/N: 387463 REV: 4.0
3-ZA20A, 3-ZA20B, 3-ZA40A, 3-ZA40B - Zoned Audio Amplifiers 3 / 3
Backup amplifier wiring
TB1 TB1 TB1
Backup amplifier
First zone amplifier
on circuit
Last zone amplifier
on circuit
++ +
-- --- -
BACK-UP BACK-UP BACK-UP
++ +
NAC/B NAC/B NAC/BNAC/A NAC/A NAC/A
-- -
SS SSS S
-- -
++ +++ +
Notes
1. All wiring is supervised and power-limited
2. Backup amplifier must be rated greater than or equal to the other amplifiers to which it is connected and must be installed in
the same enclosure
3. Backup amplifier wiring must be rated greater than or equal to the field wiring used on amplifiers connected to the backup
amplifier
Typical wiring connecting to SIGA-AAxx audio amplifier
TB2 TB2
BACK-UP BACK-UPNAC/B NAC/BNAC/A NAC/A
SSSS
UL/ULC listed 15 k EOL
for Class B circuits only
Ω
UL/ULC listed 15 k EOL
for Class B circuits only
Ω
CH1 Out
CH2 Out
CH1 In
CH2 In
TB1
TB3
SIGA-AAxx
From Signature controller or
previous Signature device
To next
Signature device
Class A only
Class A only
Zone audio amplifier
Zone audio amplifier
Notes
1. Configure the zone audio amplifiers for 25 Vrms
2. A maximum of 16 SIGA-AAxx audio amplifiers may be connected to the output of a single zone audio amplifier
3. Shield required when the audio riser wiring shares the same conduit as the telephone riser