4 prong dryer plugs

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3-Prong versus 4-Prong. There is one major difference between a 3-prong and 4-prong 220-volt outlet and that’s the missing prong. In a 4-prong outlet, there is two power lines at either side of the outlet. The bottom is the neutral line that’s dedicated to bringing power back after it passes through your appliance, and at the top is the ground.

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