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Chapter 6 4100ES SPS Field Wiring
SPS NAC Field Wiring Guidelines
Guidelines Review the following guidelines for NACs before you begin NAC field wiring.
• All wiring is 18 AWG (minimum) to 12 AWG (maximum).
• All wiring is supervised and power-limited.
• The maximum alarm current is 3 A per circuit. The supervisory current is 2.03 mA at
24 VDC.
• The nominal voltage rating is 24 VDC, 2 V p-p ripple (maximum).
• The total available current from the SPS is 9 A, unless it is used for REGULATED
• 24 VDC notification appliances, where the SPS/RPS is rated for 4Amps notification. Any current used
for card power by modules plugged into the PDI, as well as any auxiliary 24 VDC current, must be
deducted from the total available current.
• Terminal designations “+” and “-” are for the alarm state.
• All 4901-, 4903- and 4904- series appliances are Special Application with SPS. SPS is rated 9A, 3A
per circuit. SPS regulated rating per UL864 is 4A maximum per SPS. Compatible TrueAlert non-
addressable appliances for NACs are:
- 4901-series Horn
1
- 4903-series A/V
1
- 4903-series S/V
1
- 4904-series V/O
1
- 4906-Multi-Candela-series A/V, V/O, S/V, and others
1
- 49CMT-series, Multi-Tone
1, 2
- 49CMTV-series, Multi-Tone/Multi-Candela
1, 2
1
A maximum of 70 appliances can be supported per circuit.
2
Each 49CMT and 49CMTV series appliance counts as 2.7 regular appliances and no
more than 25 49CMT or 20 49CMTV-series appliances may be placed on one circuit.
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