This is for an arc welder. My female receptacle is a 50 amp 3 blade receptacle. The ground is U shaped. The other two have a long blade and a short blade. I bought a male plug to fit it. My new welder has 4 wires. Green is ground, I know that. A blue wire is tied off (per the welders instructions). That leaves a brown L1 wire and a black L2 wire, they are both hot.
My question is...which of the remaining two straight prongs on the plug are hot? Is it the tall blade (1/2"), short blade (5/16"), or both? Which blades should the brown and black wire go to? The welders instructions show nothing connected to a neutral wire. The plugs instructions just show the green wire going to the ground, and 2 other wires going to the other two blades.
Yes, it's a 6-50p receptacle. It is working correctly now. Thanks.
Assuming you are following the welder's instructions, you only need a 3 wire plug (2 hot plus ground) and that is what you have. The 50A 250V plug you have is a 6-50P in the chart at http://www.leviton.com/sections/techsupp/nema.htm right? For that case, the 2 blades are both hot and it doesn't matter which you connect to which for the black and brown wires. You don't need to match the colors used in the receptacle. If for some reason you have a different plug, indicate what you have.
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