enblethen wrote:
A NEMA 14-30 is a 30 amp 120/240 device. A standard 50 amp cord body style adapter will not plug into it as the neutral pin is not long enough.
This configuration is used for a dryer. It is four wire, two hots, neutral and ground.
I would suggest if not being used any longer would be to change it out to a fifty amp NEMA 14-50 receptacle, then use a standard 50 amp to 30 amp RV adapter.
If receptacle is needed for some other device, add another box and install a standard 30 TT receptacle. Connect one led of the circuit, neutral and ground. Insure it is wired 120 volts.
Do THIS^^^^^^^
Simple swap of receptacles
And be done with it!