The original 3-prong oven plug has the normal 2-hot wires. However, I don’t know if it was a neutral or ground wire that was the third wire, as it’s aluminum and completely stripped. I’ve looked up what to do in this situation but can’t find anything anywhere to fix it. (The wiring in this house was terribly done about 60 years ago)
Electrical – Old 3 prong oven plug has 2 hot and 1 stripped aluminum wire. How to convert this to a 4 pronged oven plug
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Best Answer
Any 3-wire range connection has 2 hots and a neutral. There is no ground. This is a dangerous condition, because a simple, common problem with the neutral wire can cause the chassis of the range to be electrified!
If you want to install a 4-wire receptacle, there are 2 options.
Option 1. You can use a GFCI circuit breaker
This is simply a matter of fitting the appropriate breaker, then marking the receptacle "GFCI Protected / No Equipment Ground".
Option 2. You can retrofit a ground wire
This is a "simple" matter of running a #10 ground wire from the receptacle location to anywhere there also is a #10 or larger ground going back to the panel. That could be the panel itself, a grounded water heater or A/C unit, the grounding electrodes out to the ground rods, or non-flex metal conduit going back to the panel.