Can anyone tell me if an L6-20P (3 wire, 20 amp) plug will plug into an L6-30R (3 wire, 30 amp) receptacle? The service to my welding area is 30 amps and therefore I should use a 30 amp receptacle. However, my Hypertherm Powermax 30 has the 20 amp plug. My Hobart HH180 and Dynasty 200 both draw 20 amps max at 240V so I could use either a 20 or 30 amp plug on them. I am trying to standardize my plugs and eliminate the need for adapters, jumpers, cheaters etc.