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Posted by Maxwell on May 20, 2008, 12:04 am
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>
>> More to think about. The welder says 100% duty cycle,
>
> (AT 90 amps AC)
>
>> tapering to 20% at full output current.
>>
>> Would that mean I could go to 8ga. ?
>>
>>
>
>
Probably depends on how you plan to use the machine, and the wire type you
choose.
Most suppliers, including Lowe's and Home Depot, sell type THHN wire.
Copper #8 is good for 55 amps, #6 is 75 amps.
http://www.westernextralite.com/resources.asp?key=23
I would bet you could wire this machine with #8, and run 3/32 rods all day
long. But if you think you might want to push the upper limits of the
machine very often, or very long - #6 might be your best bet.
You might also want a bigger machine some day, but maybe not.
In either case, you can down size your neutral one size and save a little.
Like 8,8,10 or 6,6,8.
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Posted by Pete C. on May 20, 2008, 10:00 am
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Maxwell wrote:
>
> >
> >> More to think about. The welder says 100% duty cycle,
> >
> > (AT 90 amps AC)
> >
> >> tapering to 20% at full output current.
> >>
> >> Would that mean I could go to 8ga. ?
> >>
> >>
> >
> >
>
> Probably depends on how you plan to use the machine, and the wire type you
> choose.
>
> Most suppliers, including Lowe's and Home Depot, sell type THHN wire.
> Copper #8 is good for 55 amps, #6 is 75 amps.
>
> http://www.westernextralite.com/resources.asp?key=23
>
> I would bet you could wire this machine with #8, and run 3/32 rods all day
> long. But if you think you might want to push the upper limits of the
> machine very often, or very long - #6 might be your best bet.
>
> You might also want a bigger machine some day, but maybe not.
>
> In either case, you can down size your neutral one size and save a little.
> Like 8,8,10 or 6,6,8.
It's a 240V welder, it doesn't use a neutral connection at all, just two
hots and a ground.
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Posted by Maxwell on May 20, 2008, 12:14 pm
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>
> Maxwell wrote:
>>
>> >
>> >> More to think about. The welder says 100% duty cycle,
>> >
>> > (AT 90 amps AC)
>> >
>> >> tapering to 20% at full output current.
>> >>
>> >> Would that mean I could go to 8ga. ?
>> >>
>> >>
>> >
>> >
>>
>> Probably depends on how you plan to use the machine, and the wire type
>> you
>> choose.
>>
>> Most suppliers, including Lowe's and Home Depot, sell type THHN wire.
>> Copper #8 is good for 55 amps, #6 is 75 amps.
>>
>> http://www.westernextralite.com/resources.asp?key=23
>>
>> I would bet you could wire this machine with #8, and run 3/32 rods all
>> day
>> long. But if you think you might want to push the upper limits of the
>> machine very often, or very long - #6 might be your best bet.
>>
>> You might also want a bigger machine some day, but maybe not.
>>
>> In either case, you can down size your neutral one size and save a
>> little.
>> Like 8,8,10 or 6,6,8.
>
> It's a 240V welder, it doesn't use a neutral connection at all, just two
> hots and a ground.
Agreed, but that's just terminology. Grounds and neutrals all connect back
to the same place on a 240V system, and can be downsized one wire size.
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Posted by Paul in Lapine on May 21, 2008, 9:59 pm
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> Agreed, but that's just terminology. Grounds and neutrals all connect back
> to the same place on a 240V system, and can be downsized one wire size.
>
Ummm, not entirely true. Equipment grounding conductor sizes are determined
by the size of the overcurrent device (circuit breaker ) that protects the
circuit. See NEC Table 250-122 . In the case of a 60 amp circuit ( #6 THWN
wire) one could use a # 10 copper grounding conductor. In this case you're
down 2 wire sizes, but a 20 amp circuit ( #12 copper ) requires a # 12
grounding conductor.
Paul
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Posted by Scott Lurndal on May 22, 2008, 7:45 pm
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>
>> Agreed, but that's just terminology. Grounds and neutrals all connect back
>> to the same place on a 240V system, and can be downsized one wire size.
>>
>Ummm, not entirely true. Equipment grounding conductor sizes are determined
>by the size of the overcurrent device (circuit breaker ) that protects the
>circuit. See NEC Table 250-122 . In the case of a 60 amp circuit ( #6 THWN
>wire) one could use a # 10 copper grounding conductor. In this case you're
>down 2 wire sizes, but a 20 amp circuit ( #12 copper ) requires a # 12
>grounding conductor.
>Paul
>
>
And they don't necessarily "connect back to the same place" either.
In a subpanel, the grounding and grounded conductors are _not_ bonded.
scott
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