Appendix A: Wire Requirements - Honeywell HPF24S6 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 cir-
cuit. The following table lists NAC wiring requirements for the HPF24S6 and HPF24S8 Field
Charger Power Supply.
Max.
allowable
NAC Load
total loop
(Amps)
resistance
(ohms)
0.25 6.00
0.5 3.00
0.75 2.00
1.0 1.50
1.25 1.20
1.5 1.00
1.75 0.86
2.0 0.75
2.25 0.67
2.5 0.60
2.75 0.55
3.0 0.50
Table A.1 NAC Wiring Requirements for Power Supply
NOTE: Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
HPF24S Series Power Supplies — P/N 52751:E1 4/14/2011
CLASS-B
Max. allowable wire pair lenth
(feet)
AWG 12 AWG 14 AWG 16
solid solid solid
1554 977
777 489
518 326
389 244
311 195
259 163
222 140
194 122
173 109
155 98
141 89
130 81
Max. allowable wire pair length
AWG 18 AWG 12
solid solid
613 386 777
307 193 389
204 129 259
153 97 194
123 77 155
102 64 130
88 55 111
77 48 97
68 43 86
61 39 78
56 35 71
51 32 65
CLASS-A
(feet)
AWG 14 AWG 16 AWG 18
solid solid solid
489 307
244 153
163 102
122 77
98 61
81 51
70 44
61 38
54 34
49 31
44 28
41 26
193
97
64
48
39
32
28
24
21
19
18
16
43