Wire Requirements
MS-9050UD PN 52413:C 01/23/08 197
E.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Notes: Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
Table E.2 NAC Wiring Requirements for FACP
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 13.20 3420 2150 1350 849 1710 1075 675 425
0.5 6.60 1710 1075 675 425 855 537 337 212
0.75 4.40 1140 717 450 283 570 358 225 142
1 3.30 855 537 337 212 427 269 169 106
1.25 2.64 684 430 270 170 342 215 135 85
1.5 2.20 570 358 225 142 285 179 112 71
1.75 1.89 489 307 193 121 244 154 96 61
2 1.65 427 269 169 106 214 134 84 53
2.25 1.47 380 239 150 94 190 119 75 47
2.5 1.32 342 215 135 85 171 107 67 42
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