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Posted by Bob F on May 19, 2008, 11:36 pm
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>
> 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.
More to think about. The welder says 100% duty cycle, tapering to 20% at full
output current.
Would that mean I could go to 8ga. ?
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