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Recommended Power and Ground Cable Sizes
This table came from:
http://www.the12volt.com/info/recwirsz.asp

Recommended Power and Ground Cable Sizes

To calculate the proper power and ground cable sizes, find the distance of the power cable along the top row. If your measurement is between two measurements, use the higher one. Next, find the total power the cable must support on the left. If your measurement is between two measurements, use the higher one. The size listed where your two measurements meet is the recommended cable size.


Recommended Cable Size by Power and Distance
Total RMS
Power (watts)
Distance
4 feet 8 feet 12 feet 16 feet 20 feet
100 10 gauge 10 gauge 8 gauge 8 gauge 4 gauge
200 10 gauge 8 gauge 8 gauge 4 gauge 4 gauge
400 8 gauge 8 gauge 4 gauge 4 gauge 4 gauge
600 8 gauge 4 gauge 4 gauge 4 gauge 4 gauge
800 4 gauge 4 gauge 4 gauge 2 gauge 2 gauge
1000 4 gauge 4 gauge 2 gauge 2 gauge 2 gauge
1400 4 gauge 2 gauge 2 gauge 2 gauge 2 gauge

Current Draw by Power
Total RMS
Power (watts)
Current
Amps
100 16
200 32
400 64
600 96
800 128
1000 160
1200 172
1400 188
 
Power & Ground Cable Specs
Cable Size
Wire Gauge
Current Capacity
Amperage (amps)
1/0 350
2 225
4 150
8 100
10 60
12 40
14 25
16 15
* Note: These figures have been rounded off for easy reference. Ground cables should be the same size (or larger) as the power cable.


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