Re: UPDATE - Amps through No. 6 wire

Posted by buickanddeere on March 06, 2007 at 15:13:46 from (216.183.144.25):

In Reply to: UPDATE - Amps through No. 6 wire posted by TimB from MA on March 06, 2007 at 09:12:19:

The breaker is for short circuit protection which is altogether different than overload protection.
The breaker is just there for isolation while performing maintenance and to trip during a dead short. The welder's internal protection provides the thermal overload protection.
Primary conductor varies with the welder's duty cycle. If the welder has a 60% duty cycle and a 106Amp primary. Then max primary amps of 106 X .78 =82.68 amp conductor. The max breaker size is 200% of the conductor size.
So #2 SOW cable will be required for the welder's flexable cord. And #4 RW75 copper is fine from the breaker panel to the welder plug.
A 150amp breaker should be fine and 175A is legal.
Your welder sounds a lot like my Hobart unit.

Replies:

• Re: UPDATE - Amps through No. 6 wire Tim B from MA 06:31:06 03/07/07 (0)

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