6-4
MSS NAC field wiring guidelines
Guidelines Review the following guidelines for NACs before you begin NAC field wiring.
• All wiring is 18 AWG (0.8231 mm
2
) minimum to 12 AWG (3.309 mm
2
) 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.
• When NACs are used for regulated notification appliances, maximum current per NAC is
reduced to 2 A.
• The nominal voltage rating is 24 VDC, 2 Vp-p ripple maximum.
• The total available current from the MSS is 8 A, unless it is used for regulated.
• 24 VDC notification appliances, where the MSS is rated for 4 A 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.
• 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
2
- 49CMTV-series, Multi-Tone/Multi-Candela
2
Note 1. A maximum of 70 appliances can be supported per circuit.
Note 2. Each 49CMT and 49CMTV series appliance counts as 5 regular appliances, therefore no
more than thirteen 49CMT or 49CMTV series appliances may be placed on one circuit.
• Notification appliances are rated per individual nameplate label.
• Maintain correct polarity on terminal connections. Do not loop wires under terminals.
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