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 HPF-PS6 and HPF-
PS10 Power Supply.
The numbers documented in this chart are worst case numbers, based on the conditions listed below. The maximum voltage drop, maximum
loop resistance, and wire length ratings can be increased with lower system current loading.
1. The HPF-PS6/10 is full capacity loaded at 6A/10A.
2. The HPF-PS6/10 is running at the Low Battery voltage of 20.4VDC (at Battery Connector TB15).
Wire lengths apply to Class B wiring, and to Class A wiring returned to the ZNAC-PS card.
Max Load
(Amps)
Max Loop Resistance
(Ohms)
AWG 12 (Solid) AWG 14 (Solid) AWG 16 (Solid) AWG 18 (Solid)
0.25 12.804 3320 2087 1310 823
0.50 6.402 1660 1044 655 412
0.75 4.268 1107 696 437 274
1.00 3.201 830 522 327 206
1.25 2.561 664 417 262 165
1.50 2.134 553 348 218 137
1.75 1.829 474 298 187 118
2.00 1.601 415 261 164 103
2.25 1.423 369 232 146 91
2.50 1.280 332 209 131 82
2.75 1.164 302 190 119 75
3.00 1.067 277 174 109 69
Table A.1 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.
NOTE: These distances reflect the worst case scenario and are based on the correct draw of the highest candela strobes at the low end of the
supported NAC voltage with the entire load at the end of the circuit. Further distances can be achieved by performing a point to point voltage
calculation that more accurately reflects the specific devices used and how they are dispersed on the circuit.
42
HPF-PS Series Instruction Manual — P/N LS10227-003HP-E:C 2/2/2022
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