Re: 230 single phase
 

If they are marked 20 on each. Its a 20 amp breaker.

Re: 230 single phase
 

yea thats what the guy said at home depot...i figure as long as i dont push the welder to its limits ill be fine or it will pop the breaker which is no biggie

Re: 230 single phase
 

im an electrical contractor here in az i have all the ---- laying arronud ill give you if you can get me a pic of your set up your gonna need a pice if 10/3 a twin 30 amp breaker and a 30 amp receptical when doing the calculations your breaker size is supposed to be 125% of your max load capacity cal it 22 amps divided by 4 is about 5 so your total ams needed to run your welder is 27 amps so grand total is a 30 amp dedicated circuit to run your welder to its full potential with out poping your breaker right in the middle of your job lmk if you want that ---- all you will have to pay is shipping for the wire breker box and recep

Re: 230 single phase
 

Thank you bigmike :) We always went by the 75% calculation, but I like that 125% rule too...gives you a little extra to play with.

Re: 230 single phase
 

Jesus Christ, everybody is an electrician. ::) I can go through and disagree with at least one thing everybody said, but who the ---- am I? ::)

My horseshit input:

A 20 amp 2 pole breaker is just that, a 20amp 2 pole breaker. Yes, you can pull ~20amps through each of them without tripping the breaker to total ~40amps, but it's still a 20amp breaker and NOT a 40amp. A 40amp 2 pole breaker is NOT 2 20amp breakers tied together. :1 If it were, wouldn't that make it the same exact rating as a 2 pole 20amp breaker under that idea?

I don't know ---- about welders, but 99.9% of the welders I wire for are ~40amp welders using a 3wire(2 hots, neutral, and a ground) 8ga. wire and usually uses a range plug, Leviton part#279.
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Re: 230 single phase
 

if u can disagree with one thing that i said i think ill have to call you on your bullshit this is what i do day in and day out everyday of my life since i was 13 years old

Re: 230 single phase
 

Ok, I'll tell you where you're wrong, and I bet you will even agree with me. :4


A 30amp "twin" breaker is going to give him 2 120v hots, but from the same phase, which won't give him 220v total. A 30a "2-pole" breaker will give him what he needs.
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Re: 230 single phase
 

twin and two pole are the same thing but yes ill agree i should have said 30 amp two pole

Re: 230 single phase
 

Negative. A "twin" is a breaker that feeds 2 circuits from the same phase. A "2-pole" is a breaker that feeds 1 or 2 circuits from seperate phases. :P
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Re: 230 single phase
 

There are a few different names for them...twin is one that I've heard before. Boost is talkin' about the single sized breakers that are divided into 2 with the little trip levers, but still take up the same space as a single.
I'm pretty much officially retired as an electrician now...I'd be happy as ---- if I never have to do any of this ever again...government sat/com ftw!