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My dryer stop heating up and came to realize the 30A 3prong outlet and 3prong dryer cord melted, so I removed outlet to replace and there is 4 wires rather then 3? Shouldn’t it had been a 4 prong outlet? Is it safe for me to use a 30A 3prong outlet and ground the copper ground wire to the metal box?

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    Yes ground the box. It really depends on your dryer and if it needs a neutral or not. But if you’re using the dryer the 3 wire is fine of course.

    But I would really just replace it back with the three wire and call it done. Two hots and a ground.