Thread: Wire size for 40A welder
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Doug Miller Doug Miller is offline
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Default Wire size for 40A welder
In article , wrote:
To connect a welder about 15 feet from breaker box. The welder says
primary amps 40. A wire chart on a website shows #6 as 37.5 amps.

Wow, I wonder where they came up with that. The National Electrical Code shows
#6 copper at 55 amps.

Will #6 be close enough or should I use #4?

Neither -- #8 copper is quite sufficient for 40 amps. If you're using
aluminum, then you need #6. But in no case do you need #4 for a load of only
40 amps.


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Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.
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