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RE: Electrical wiring query

To: Shop-talk@autox.team.net
Subject: RE: Electrical wiring query
From: "PHINNEY,HARRY K (HP-Corvallis,ex1)" <harry_phinney@hp.com>
Date: Mon, 11 Mar 2002 14:05:39 -0800
To the best of my knowledge the NEC allows derating the load on a welder
circuit based on the duty cycle of a welder. In other words, because your
welder is only capable of drawing 50 amps for something like 4 minutes (or
less) out of 10, the wiring to a _dedicated_ welder outlet can be lighter
than the 6 gauge required to support a constant 50 amp load. This may or may
not be allowed by your local regulations. The only ways to know are to ask
an electrician in your area, or a local electrical inspector. If you ask an
inspector, either keep the discussion very hypothetical, or be prepared to
take out a permit on the work.

Harry Phinney

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