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