42
HPF24S Series Power Supplies —
P/N 52751:D3 5/11/2010
Appendix A: Wire Requirements
Connecting external system accessories to the main circuits must be carefully considered to ensure
proper operation. It is important to use the correct type of wire, gauge and run length for each
circuit. The following table lists NAC wiring requirements for the HPF24S6 and HPF24S8 Field
Charger Power Supply.
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
12.80
3316
2085
1309
824
1658
1042
654
412
0.5
6.40
1658
1042
654
412
829
521
327
206
0.75
4.27
1105
695
436
275
553
347
218
137
1.0
3.20
829
521
327
206
415
261
164
103
1.25
2.56
663
417
262
165
332
208
131
82
1.5
2.13
553
347
218
137
276
174
109
69
1.75
1.83
474
298
187
118
237
149
93
59
2.0
1.60
415
261
164
103
207
130
82
51
2.25
1.42
368
232
145
92
184
116
73
46
2.5
1.28
332
208
131
82
166
104
65
41
2.75
1.16
301
190
119
75
151
95
59
37
3.0
1.07
276
174
109
69
138
87
55
34
Table A.1 NAC Wiring Requirements for Power Supply
