12 Volt Wiring Tech: Gauge to Amps

12 Volt Wiring Gauge Requirements at specific Amps for Automotive Electrical Systems   …   

To choose an adequate wire gauge, determine the amp draw (amperage) that the wire circuit will carry.  Then measure the distance that the wire will travel (length) including the length of the return to ground (the ground wire running to the chassis or back to a ground block or battery.  Using these two numbers, Amps and length, locate the nearest gauge value in chart below.  For 6 volt automotive systems typically a wire gauge 2 sizes larger than what is shown should be used.  

Amps 
@ 12 Volts
LENGTH OF WIRE
American Wire Gauge (AWG)
3′5′7′10′15′20′25′
0 to 118181818181818
1.518181818181818
218181818181818
318181818181818
418181818181818
518181818181818
618181818181816
718181818181816
818181818181616
1018181818161614
1118181818161614
1218181818161614
1518181818141412
1818181616141412
2018181616141210
2218181614121210
2418181614121210
3018161412101010
3616141412101010
401614121210108
501614121010108
10012121010664
150101088442
20010886442
 
 

 

 

Also see: 
 
Automotive Wiring Tips – Using Relays

12 Volt Wiring Gauge Requirements at specific Amps for Automotive Electrical Systems

12 Volt Wiring – Distance and Amps to Gauge Chart

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