I need to install a 4-prong 240V outlet and have old 3-wire without ground. Can you add just a ground wire without running entirely new wiring?

In: Modification of Old Electrical Work

Answer

You can, but it doesn't meet code.

The best option is to run new wire. If you can't, go with your separate ground wire. It is hackish, but it does work.

If this is for a dryer or range, they do sell 3 prong cords for old work. You can ground your appliance directly with the fourth wire. Same result, and a little better than hacking the outlet.

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First answer by TJNII. Last edit by TJNII. Contributor trust: 361 [recommend contributor]. Question popularity: 10 [recommend question]

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Wiring 4 wire 240v? What if you don't have a ground wire? Can you provide a local ground without having to run a new wire? I need to install a 4-prong 240V outlet and have old 3-wire without ground Can you add just a ground wire without running entirely new wiring?