DC Current Wiring Size / Length Chart

DC Wiring Chart

The chart is calculated on no more than 2% voltage drop across the wire distance.

The distance is twice your length.  If you are running a 2’ cable then your distance for the chart is 4’.  This accounts for the round trip distance of the run.

Maximum length of wire 

2’

4’

6’

8’

10’

12’

14’

16’

20’

24’

28’

Amps                      
3 Volt System                      
1 amps or less 22 ga 22 ga 20 ga 18 ga 18 ga 16 ga 16 ga 14 ga 14 ga 14 ga 12 ga
3 amps or less 20 ga 16 ga 14 ga 14 ga 12 ga 12 ga          
5 amps 18 ga 14 ga 12 ga 12 ga 10 ga 10 ga 10 ga 10 ga 8 ga 8 ga 6 ga
10 amps 14 ga 12 ga 10 ga 8 ga              
6 Volt System                      
Up to 5 amps 20 ga 18 ga 16 ga 14 ga 14 ga 12 ga 12 ga 12 ga 10 ga 10 ga  
10 amps 16 ga 14 ga 12 ga 12 ga 10 ga 10 ga 8 ga        
15 amps 16 ga 12 ga 10 ga 10 ga 8 ga            
12 Volt System                      
Up to 5 amps 22 ga 20 ga 18 ga 16 ga 16 ga 16 ga 14 ga 14 ga 12 ga 12 ga 12 ga
10 amps 18 ga 16 ga 16 ga 14 ga 14 ga 12 ga 12 ga 12 ga 10 ga 10 ga 8 ga
15 amps 18 ga 16 ga 14 ga 12 ga 12 ga 10 ga 10 ga 10 ga 8 ga 8 ga  
24 Volt System                      
Up to 5 amps 22 ga 22 ga 22 ga 20 ga 20 ga 18 ga  18 ga 16 ga 16 ga 16 ga 14 ga
10 amps 22 ga 20 ga 18 ga 18 ga 16 ga 16 ga 14 ga 14 ga 14 ga 12 ga 12 ga
15 amps 20 ga 18 ga 16 ga 16 ga 14 ga 14 ga 12 ga 12 ga 12 ga 10 ga  10 ga

This chart was not prepared by an electrical engineer.  The chart is conservative but teams should use this only as a general guide.

http://tech.txdi.org/dcwiringchart

It is always OK to use a larger wire size.  The only consideration when using larger wire is the difficulty in handling the wire.

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