The key difference in the wiring configuration between 3 prong and 4 prong cords is that with the older setup the 3 prong cord has only two hot wires and one neutral wire there is no separate ground wire.
Dryer power cord 4 prong to 3 prong.
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The national electrical code currently requires 4 prong dryer outlets in all new home construction.
In an effort to shed some light on this subject we re going to discuss the purpose of these cords and why there s a growing popularity for 4 prong cables.
In recent years most dryer manufacturers have adopted the 4 prong electrical cord over the dates 3 prong model.
Therefore the dryer s neutral was tied to the ground connection on the metal case of the dryer.
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While they can both effectively power a traditional dryer the 4 prong model contains an extra grounding wire as a preventive measure.
Unfortunately few people understand the difference between 3 prong and 4 prong dryer cords.
A 3 prong dryer cord was the standard for dryers prior to 2000.
Before the mid 1990s most electric clothes dryers operated with three prong plugs that fit into three slot outlets but since 1996 the electric code has required four slot.
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Existing homes may still use 3 prong outlets.