Changing A Dryer Cord From 3-Wire to 4-Wire
July 2, 2006
Q: I just bought a new house and the dryer plug is the new 4-wire type. My dryer has the old 3-wire cord on it. So I went to Home Depot and bought a new 4-wire dryer cord. I removed my old cord and started to install the new one but, I’m stumped. What do I do with the green wire?
A: This is a common question we receive and a common mistake most every general contractor makes that we work with.
With a 3-wire system your neutral terminal will have a copper clad or aluminum strap or green wire connected between it and the frame. You need to remove this when changing to a 4-wire cord.
Terminate the wires from your new 4-wire cord as black to black terminal, white to white terminal, red to red terminal and green to ground screw on frame. This is the other end of that strap or green wire you need to remove from the white (neutral) terminal.
When changing to a 4-wire cord it is very important to remove the strap or wire that connects between the white terminal and the dryer’s frame. If you do not remove this, your neutral or grounded conductor will allow electricity to flow through your dryer’s frame and shock you each time you touch your dryer.
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