Appendix A: Wire Requirements - Honeywell HPF24S8 Installation Manual

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.
Max.
NAC allowable
Load total loop
(Amps) resistance
(ohms)
0.25 12.80
0.5 6.40
0.75 4.27
1.0 3.20
1.25 2.56
1.5 2.13
1.75 1.83
2.0 1.60
2.25 1.42
2.5 1.28
2.75 1.16
3.0 1.07
Table A.1 NAC Wiring Requirements for Power Supply
Calculations are based on Direct-Current Resistance data for uncoated copper wire, per National
Electrical Code (2005 Edition) Table 8, Conductor Properties.
42
CLASS-B
Max. allowable wire pair length (feet)
AWG 12 AWG 14 AWG 16
solid solid solid
3316 2085 1309
1658 1042 654
1105 695 436
829 521 327
663 417 262
553 347 218
474 298 187
415 261 164
368 232 145
332 208 131
301 190 119
276 174 109
Max. allowable wire pair length (feet)
AWG 18 AWG 12 AWG 14
solid solid solid
824 1658 1042
412 829 521
275 553 347
206 415 261
165 332 208
137 276 174
118 237 149
103 207 130
92 184 116
82 166 104
75 151 95
69 138 87
HPF24S Series Power Supplies — P/N 52751:D3 5/11/2010
CLASS-A
AWG 16 AWG 18
solid solid
654 412
327 206
218 137
164 103
131 82
109 69
93 59
82 51
73 46
65 41
59 37
55 34