Thread: Power Hook up for welder and air compressor.

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Kurt, you need first to figure the total amps you expect to run if both the compressor and the welder are running at the same time. Say, for example, the compressor requires a 30 amp two pole breaker (240volt), and the welder needs a 40 amp; you will need to get one 70 amp two pole breaker for the main panel, then in the small panel outside, put in a 30A 2 pole, and a 40A 2 pole, and wire the plugs from them. Wire size for that run from the main panel to the sub-panel should be #4 stranded copper, and the 30A circuit would require #10, and the 40, #8. Use stranded for all of it, and size your ground run the same as the current carrying conductors. Feel like you might want a coach, PM me; I might like a field trip.