Originally Posted by roger1
The breaker protects the wire.
The feed cord on your 20 Amp welder will be #12 wire. It will not be protected with a 30 Amp breaker and will create a hazard even if your extension cord is #10.
roger1..............the specs for the welder say the power cord is a "50A, 250V, Three Prong Plug (NEMA Type 6-50P)." Input is 20A with a recommended fuse or breaker size of "40A Super Lag." Sounds confusing to me.