6-10
MSS auxiliary power wiring
Guidelines • All wiring is 18 AWG (0.8231 mm
2
) and 12 AWG (3.309 mm
2
).
• All wiring is power-limited.
• When a NAC is configured as an auxiliary power circuit, no end-of-line resistor is used.
• Auxiliary power may be taken from the dedicated auxiliary power tap or from an unused NAC. The Aux
power circuit can be used to power four-wire detectors. It can also control unit accessories and other
supplemental devices.
• If auxiliary power is taken from NAC terminals, the NAC must be configured as an auxiliary power point
type in the ES Panel Programmer.
• Remove end-of-line resistors from NACs when used for auxiliary power.
• External wiring from the dedicated auxiliary power tap is not supervised unless an end-of-line relay is
wired to auxiliary power, and normally open contacts are monitored by a system power point. Relay
current must be considered as part of the load. When NACs are used as AUX power taps, they are
supervised for overcurrent or short-circuit faults. When only addressable devices are connected to the
auxiliary power tap, an end-of-line relay is not required. This is because the power for the addressable
devices is supervised due to the device being addressable.
• All wiring that leaves the building requires overvoltage protection. Install module 2081-9044 wherever
wire enters or exits the building.
• Voltage rating: 24 VDC (nominal), 2 Vp-p ripple (maximum).
• The following devices are compatible with 24VDC aux. power:
- 2088-series relays and door holders
- 2098-series four-wire smoke detectors
- 4090-series IDNet ZAMs
- 4098-series four-wire smoke detectors and duct detectors
- 4190-9050/9051 4-20 mA ZAMs
- 4606-9102 LCD Annunciator
- 4100-94XX InfoAlarm Remote Annunciators
- 4100-7401, -7402 Graphic Annunciator Modules
• The total auxiliary current available is 4 A. The total current available for the entire MSS is 8 A (special
application) or 4 A regulated 24 VDC, including NAC, auxiliary, and card power.
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