View Full Version : Installing a dedicated circuit for my 110v mig
10-30-2009, 11:00 AM
I'm running a Hobart 140 in the garage and decided that I should do the right thing and put it on it's own circuit. The manual states that a dedicated 20a circuit is needed, but I guess what I'm wondering is why not a 30a? The duty cycle chart shows it drawing 20a while the weldering is putting out 90a, but the highest setting should be 140a. Am I looking at something wrong here? Should I stick with the 20a individual circuit or would I be better of running a 30a circuit? The run from where the outlet will be to the breaker box in the basement will be something like 10 feet if that matters at all.
10-30-2009, 11:22 AM
Best to stay with a 20 amp circuit.
you will not need 30 amps:nono: and it may be an issue if for some reason your welder went wonky and burnt up because of the extra heat needed to blow the 30 amp fuse.
10-30-2009, 01:47 PM
There is nothing wrong with a 30amp and any fault that would cause wonkyness will trip a 30amp just as fast.
We plug 5,7, 8,10 & 15 amp tools in to 20amp protected Circuits all the time.
but a dedicated 20amp will be plenty for the HH140
10-30-2009, 03:01 PM
The manual says a 20A breaker is enough, then use a 20A breaker.
That said, I have occasionally tripped the 'recommended' 20A breaker with my little Lincoln even though it was on its own dedicated circuit. I suspect the power company was running a little low on voltage that day(s).
A 30A breaker is not -needed-, but not a bad thing.
NOTE: if you put a 30A breaker in the circuit, you have to either size the wire for 30A -OR- prominently label the dedicated outlet something like "For Welder Use ONLY!".
The 20A breaker and a (HOPEFULLY) short run of 12AW copper wire for the circuit is usually 'enough' for the welder in most cases and usually 'easier' to do for code and electrical inspections.
10-30-2009, 03:53 PM
Thanks guys. I already have a 20a outlet and 12aw wire on hand, so that will certainly be a cheap and easy thing for me to do. Just have to buy a breaker and I'm set to go. I'm also going to wire all my pull-cord overhead lights to a switch by the door so that I can turn them all on at once.
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