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Chapter 6 4100ES SPS Field Wiring
SPS Auxiliary Power Wiring
Guidelines • All wiring is 18 AWG and 12 AWG.
• 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.
• If auxiliary power is taken from NAC terminals, the NAC must be configured as an
auxiliary power point type in the 4100 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 coil 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.
• All wiring that leaves the building requires overvoltage protection. Install module
2081-9044 wherever wire enters or exits the building. A maximum of four 2081-9044
Modules may be connected to one channel.
• Voltage rating: 24 VDC (nominal), 2 V P-P ripple (maximum).
• The following devices are compatible with 24VDC aux. power:
- 2088-series relays and door holders
- 2098-series four-wire smoke detectors
- 2190-series monitor and signal ZAMs
- 4090-series IDNet ZAMs
- 4098-series four-wire smoke detectors and duct detectors
- 2190-9039 Printer
- 4190-9050/9051 4-20 mA ZAMs
- 4603-9101 LCD Annunciator
• The total auxiliary current available is 5 A. The total current available for the entire SPS is
9A (special application) or 4A regulated 24VDC, including NAC, auxiliary, and card
power.
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