An older three-wire dryer outlet has two "hot" slots and neutral/ground slot. This is designed to fit older dryers that have cords with three-prong plugs. In newer installations, the dryer outlet has four slots, with two "hot" slots, a neutral slot, and a grounding slot.
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If you happen to have a loose mating 3-prong plug NEMA 10-30P, attach its X and Y terminals to two line wires and attach W to the neutral (refer to L14-30 pinout above). Alternatively, if you have a 3-prong drier cord, you can tie its loose ends to L1, L2 and N of the generator cord by using wire nuts.
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Circuit breaker Although three-pronged dryer cords and outlets are largely outdated, some homes can still choose to use them. If you have to update the wiring or rewire your outlet, however, you can actually do it easily.
I will cover both situations. In the first section, I will be showing you how to connect a dryer cord that matches your 3-prong or 4-prong outlet. Most older homes are wired for the 3-wire outlet as shown below: The 3-wire connection is now outdated where current dryers are wired with a 4-wire cable.