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NAC Wiring
E.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Max.
allowable
NAC Load
total loop
(Amps)
resistance
(ohms)
0.25
12.72
0.5
6.36
0.75
4.24
1
3.18
1.25
2.54
1.5
2.12
1.75
1.82
2
1.59
2.25
1.41
2.5
1.27
Notes:
1.
Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
MS-9600LS Series Manual — P/N 52646:B2 2/12/2010
CLASS-B
Max. allowable wire pair length
(feet)
AWG 12
AWG 14
AWG 16
solid
solid
solid
3295
2072
1301
1648
1036
650
1098
691
434
824
518
325
659
414
260
549
345
217
471
296
186
412
259
163
366
230
145
330
207
130
Table E.2 NAC Wiring Requirements for FACP
Max. allowable wire pair length
AWG 18
AWG 12
AWG 14
solid
solid
solid
819
1648
1036
409
824
518
273
549
345
205
412
259
164
330
207
136
275
173
117
235
148
102
206
129
91
183
115
82
165
104
Wire Requirements
CLASS-A
(feet)
AWG 16
AWG 18
solid
solid
650
409
325
205
217
136
163
102
130
82
108
68
93
58
81
511
72
45
65
41
197
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