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Dryer Plug 4 Prong Vs 3 Prong

Dryer Plug 4 Prong Vs 3 Prong

I just purchased a new dryer that has a 4 prongblade plug. My home is older and the installed receptacle is only 3 prong. I thought it best to try to replace the old 3-slot wall receptacle with a new 4-slot. The three wires inside the old receptacle are black, white and bare copper. I see wiring diagrams for a new receptacle calling for 4 wires black, white, red and green.

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