I am trying to wire for a 4 prong plug into a an old receptacle pre 1972 with only red and black wires with metal conduit into metal box.
It has been used since 1964 hard wired 220B with metal conduit all the way to the box.
Electrical – How to wire a 4 prong plug into a an old receptacle with only red and black wires with metal conduit into metal box
electricalrangereceptacle
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Best Answer
Okay, going off of what you have, you need at least a 3/4in conduit back to the panel. You are going to need to pull a white and a green from the panel to the receptacle box and install a ground stinger in the metal box to bring it up to code. The wire will need to be sized to the amp draw. If it is not a cost thing I would pull all new wire in using the old wire to pull it in.
You can turn of the main breaker to the panel, but the feeders from the meter will be hot.