Nac Wiring - Honeywell fire-lite alarms MRP-2002E Manual

Wire Requirements
F.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Max.
allowable
total loop
NAC Load resistance
(Amps) (ohms)
0.25 13.60
0.5 6.80
0.75 4.53
1 3.40
1.25 2.72
1.5 2.27
1.75 1.94
2 1.70
2.25 1.51
2.5 1.36
2.75 1.24
3 1.13
Note: Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
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Table F.2 NAC Wiring Requirements for FACP
CLASS-B
Max. allowable wire pair length
(feet)
AWG 12 AWG 14 AWG 16
solid solid solid
3523 2215 1391
1762 1107 695
1174 738 464
881 554 348
705 443 278
587 369 232
503 316 199
440 277 174
391 246 155
352 221 139
320 201 126
294 185 116
Max. allowable wire pair length
AWG 18 AWG 12 AWG 14
solid solid solid
875 1762 1107
438 881 554
292 587 369
219 440 277
175 352 221
146 294 185
125 252 158
109 220 138
97 196 123
88 176
80 160 101
73 147
MRP-2002 & MRP-2002E PN 53049:A1 5/01/2008

NAC Wiring

CLASS-A
(feet)
AWG 16 AWG 18
solid solid
695 438
348 219
232 146
174 109
139 88
116 73
99 63
87 55
77 49
111 70 44
63 40
92 58 36