I'm replacing an oven that was wired with 240V 3-wire 30A (Black, White, Red) and the new oven is 240V 4-wire 30A. Can I run a copper ground wire from a 15A grounded outlet two feet away?
Electrical – 3-Wire 30A needs to be 4-wire 30A for new oven, can I run a ground from wall outlet
electricalwiring
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Best Answer
No, you can't. That ground wire isn't nearly big enough!
You are allowed to retrofit just a ground, however it has to go
There is no need for the retrofit ground to be routed with the conductors, since it does not carry current except during fault conditions. Use any feasible route.