NFW-100X Manual — P/N LS10131-001NF-E:C 7/25/2018 143
NAC Wiring Wire Requirements
D.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Notes:
1. Calculations are based on Direct-Current Resistance data for uncoated copper wire, per National Electrical Code (2005 Edition)
Table 8, Conductor Properties.
2. These distances reflect the worst case scenario and are based on the current draw of the highest candela strobes at the low end of the
supported NAC voltage with the entire load at the end of the circuit. Further distances can be achieved by performing a point-to-
point voltage calculation that more accurately reflects the specific devices used and how they are dispersed on the circuit.
3. If using Gentex brand notification appliances, the “UL Max” current rating published in their data sheets, must be used in order to
maintain performance under low battery conditions with the maximum wire resistances shown in the table above.
NAC Load
(Amps)
Max.
allowable
total loop
resistance
(ohms)
CLASS-B
Max. allowable wire pair length
(feet)
CLASS-A
Max. allowable wire pair length
(feet)
AWG 12
solid
AWG 14
solid
AWG 16
solid
AWG 18
solid
AWG 12
solid
AWG 14
solid
AWG 16
solid
AWG 18
solid
0.25 14.40 4450 2797 1756 1105 2225 1399 878 553
0.5 7.20 2225 1399 878 553 1112 699 439 276
0.75 4.80 1483 932 585 368 742 466 293 184
1 3.60 1112 699 439 276 556 350 220 138
1.25 2.88 890 559 351 221 445 280 176 111
1.5 2.40 742 466 293 184 371 233 146 92
1.75 2.06 636 400 251 158 318 200 125 79
2 1.80 556 350 220 138 278 175 110 69
2.25 1.60 494 311 195 123 247 155 98 61
2.5 1.44 445 280 176 111 222 140 88 55
Table D.2 NAC Wiring Requirements for FACP
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