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Tool Talk Discussion Board

Re: Circuit breaker for welder


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Posted by John T on October 24, 2010 at 16:24:14 from (66.244.97.31):

In Reply to: Circuit breaker for welder posted by awlknottedup on October 24, 2010 at 15:03:23:

Cant really say not knowing the welders actual current draw, but many older 225 amp 240 volt AC buzz box stick welders used a 50 amp branch circuit and 50 amp 240 volt two pole circuit breaker (with a 50 map receptacle into which the welder was plugged in)........You first consider the load, then size the feeder wires appropriately, then size the circuit breaker to protect the feeder wiring, like if its 50 amp rated wire, then one could use a 50 amp breaker. Many old straight 240 VAC AC buzz box stick welders require 3 wires ran to their receptacle, 2 hots (L1 & L2 Red n Black) plus an Equipment Grounding Conductor (Green/Bare). If the welder is equipped with a 40 amp plug, then you could get by using a 40 amp rated receptacle and 40 amp wiring and a 40 amp breaker, but it may well have a 50 amp plug in which case Id run 50 amp branch circuit wiring and breaker. You may want to just run a 50 amp branch circuit anyway for later upgrade use.

John T


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