Audio NAC wiring with constant supervision
Provide Audio NAC wiring with constant supervision as shown in Figure 6.
Figure 6: Audio NAC wiring with constant supervision
Note:
1. Leave the 10 K, 1/2 W resistors (378-030 – brown/black/orange) on the B+ and B- terminals of unused circuits.
2. For 25 V Systems, use 4081-9008 EOL Harness 10K 1/2W. For 70 V System, use 4081-9018 EOL Harness 10K 1W.
3. 4100-1268 XSIG Constant Supervision NAC Adapter Card.
4. 4100-5116 XSIG Card.
Note:
• Leave the 10 K, 1/2 W resistors (378-030 – brown/black/orange) on the B+ and B- terminals of unused circuits.
• Remove the 10 K resistors from the B+ and B- terminals on the XSIG card.
• All wiring is between 18 AWG (0.8231 mm
2
) (minimum) and 12 AWG (3.309 mm
2
) (maximum).
• Field wiring is power-limited.
• Maximum speaker load for each NAC is 50 W. Maximum current per NAC is 1.4 A. The maximum number of speakers per NAC is 100.
• Shields, when required, are normally connected to 0 V as shown. Alternate shield termination using earth ground is provided on amplifier
chassis.
• Signal wiring must test free of all grounds.
page 8
579-516 Rev. J
Expansion Signal (XSIG) Card Installation Instructions
