Hi all,
I’m getting ready to install a welder that draws 72 amps (at 220 volts) into a newly constructed workshop. I haven’t run the wiring for it yet
and want to know if there is a plug and receptacle rated for that amount of current, or should it be hardwired.
Also, is there a circuit breaker rated for that amount of current, or should I fuse it at a lower amount, like 50 amps which seems to be a common size for electric stoves.
Thanks for all advice!
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Replies
What does the manufacturer require for a connection?
75amp breaker = #4 wire
My 480v bologny cord caps for the temp power boxes are only 50 amps.
“It so happens that everything that is stupid is not unconstitutional.†—Supreme Court Justice Antonin Scalia
it draws 78 amp but only if you turn it all the way up and weld 100% continue. Most welder only need a 50 amp outlet.
I don't have the manufacturer's data-it's an old welder from the 1950's. It won't be used at the highest power or for very long so it makes sense to me to fuse it at 50 amps since those plugs and receptacles are readily available.
Thanks for the responses!
Oddly enough, there are specific nec requirements for welder circuits. The usual rules for sizing breakers and wires do NOT apply.
The nameplate on the machine has lots of other information on it. One critical piece is "duty cycle." Without the complete information, an answer is not possible.