AWG Strand DC resistance
1
[Ω/ft.] Total cable length
2
[ft]
25°C 75°C 25°C 75°C
12 Solid .0017 .0020 136 116
12 7/20 .0015 .0018 155 129
12 19/25 .0017 .0020 136 116
12 65/30 .0018 .0022 129 105
12 165/34 .0016 .0019 145 122
1
Data from Alpha Wire, wire manufacturer.
2
Combined positive and negative run.
Using other wire sizes
If you need greater length for your combined positive and negative DC wires, you must choose a
wire with a lower resistance and calculate the total cable length.
For example, a solid #10 AWG has a lower DC resistance than a serial #12 AWG.
DS4243, DS2246, DS4486, and DS4246 Installation and Service Guide 68
Recommended power line sizes
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