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Posted by Pete C. on May 20, 2008, 10:05 am
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Ignoramus4856 wrote:
>
> >
> > Ignoramus31588 wrote:
> >>
> >> > I just picked up an old Ac/DC Dayton welder (230/180 amps). The label
says "Pri
> >> > Amps 65.7" at 230 volts. Can anyone help me determine what size wire I
need to
> >> > run to an outlet to feed this thing. I will probably want 20-25 feet or
so.
> >> >
> >> > Dayton 3Z563
> >> > $75
> >> > Pri Volts 230-O.C.V. 78-Arc Volts 25-Pri Amps 65.7-Sec Amps 230
> >> >
> >> > It'll be a big step up from my ancient 130 amp AC buzz-box. Finally, I
get tp
> >> > play with DC.
> >>
> >> Go to Home Depot and look up table next to the wire spools. I believe
> >> #4 will cover you nicely, according to my table.
> >
> > Did you take into account the duty cycle derating the NEC allows? NEC
> > article 630.11 and table 630.11(A), multipliers range from 1.00 for 100%
> > duty cycle welders down to 0.45 for 20% duty cycle or less. If the
> > welder in question were rated at say 50% duty cycle, the multiplier
> > would be 0.71 so you'd size the wire for a 46.647A load (rounded up to
> > 50A) or 6ga copper conductors.
>
> Yes, but is it a good idea? I do not think so. He may want to use the
> outlet for other things too. Much better to go to #4 and have a full
> powered outlet.
Certainly a possibility. It's one of the places where the NEC allows
things that may not be the best idea outside of an industrial
environment. If the SWMBO want's to use the outlet for a pottery kiln or
other non-welder use as well, then a normally rated feed would be more
appropriate. Of course with the price of copper these days, if the run
from the panel is significant the cost difference may be surprisingly
high.
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