> My house breaker box is the power source with a 30 amp breaker feeding a subpanel in the barn which is 200 ft away. In the barn subpanel I have a welder connected to a 30 amp breaker (it came free with the subpanel so I used it for the welder). From welder to subpanel it is 20 ft, including power cord.
When sizing a breaker, it should be sized appropriately to protect the downstream wiring. Not necessarily the load device. Welders usually have thermal protection that shuts them down when they overheat; since the 30 amp breaker is tripping before the welder's thermal protection, it sounds like you need bigger circuit breakers. And if the 30 breaker in your house is protecting a 10 gauge feeder to the barn, that cable is way undersized for running most welders 200 feet away from electrical service.
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