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Converting Electric Clothes Dryer 3-Prong Cords to 4-Prong Cords - NEC Rules
3-Prong And 4-Prong Electric Dryer Cords
Newer homes are now being equipped with 4-prong dryer cord plugs. This is the new standard and is required under Article 550.16(A)(2) of the National Electrical Code (NEC) 2008. Connections of electrical clothes dryers shall be made with a 4-conductor cord and 3-pole, 4-wire, grounding-type plugs or by Type AC cable.