System Sensor PDRP-2001 - Manual (Page 135)

PDRP-2001 Series Manual — P/N 53043:E1 2/28/2011 135
NAC Wiring Wire Requirements
F.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
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 13.60 3523 2215 1391 875 1762 1107 695 438
0.5 6.80 1762 1107 695 438 881 554 348 219
0.75 4.53 1174 738 464 292 587 369 232 146
1 3.40 881 554 348 219 440 277 174 109
1.25 2.72 705 443 278 175 352 221 139 88
1.5 2.27 587 369 232 146 294 185 116 73
1.75 1.94 503 316 199 125 252 158 99 63
2 1.70 440 277 174 109 220 138 87 55
2.25 1.51 391 246 155 97 196 123 77 49
2.5 1.36 352 221 139 88 176 111 70 44
2.75 1.24 320 201 126 80 160 101 63 40
3 1.13 294 185 116 73 147 92 58 36
Table F.2 NAC Wiring Requirements for FACP