Originally Posted by OldCoot
Why does a 240V 50A service fry a 50 rv plug? BombDoc and a lot of others have fried theirs by plugging into a 50A 250V receptacle like for a welder.
Getting way off topic, but anyone with a welder on residential service is wired the same way - split phase with two 120V hot legs.
Their problem with their RV service was an open neutral or ground so guess what happens on the return path - you get 220 surging/backfeeding the intact ground or neutral!
Conversely, you very much can mis-wire a 30A.