copper wire extension

Thread Starter

96y

Joined May 8, 2019
31
Most auto battery cable wire is about 4 awg copper stranded. I f someone used a piece of extension wire to lengthen
the run and it was 6 ga copper stranded but less strands and slightly bigger strands....would that present a real problem?
The 6 ga would be the piece that was connected to the battery..
thanks
 

djsfantasi

Joined Apr 11, 2010
5,833
4 gauge wire is rated up to 135A of load current. 6 gauge wire (regardless of strand size and number) is rated for 101A. So it’s not safe to substitute for 4g wire.
 

be80be

Joined Jul 5, 2008
1,961
It will more then likely get hot not a good ideal.
just like jump starting a car them cheap jumper cables get hot waste power.
You need a good old big set welding cable size LOL
If its 4 gauge use 2 gauge to make it longer.
 

JMW

Joined Nov 21, 2011
122
Most auto battery cable wire is about 4 awg copper stranded. I f someone used a piece of extension wire to lengthen
the run and it was 6 ga copper stranded but less strands and slightly bigger strands....would that present a real problem?
The 6 ga would be the piece that was connected to the battery..
thanks
House hold wire is not meant to be used on vehicles, regardless of gauge. It is far too stiff, and neither heat or oil resistant. That being said, if you are in a jungle or desert, with no other resources, it can be used.
 

SamR

Joined Mar 19, 2019
1,486
House hold wire is not meant to be used on vehicles, regardless of gauge. It is far too stiff
By the same token neither is welding lead wire. The smaller strands are too fragile for the constant vibration of automotive use. It does make great jumper cables though.
 
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