I have a four pronged Receptical for a dryer coming from the main breaker
Does the ground wire, (after conecting to the receptical) also have to have a runner going to the side of the metal box on the wall
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Re: Electrical wiring for a dryer
If you have a four prong recepical then the receptical has 2 hot wires, 1 neutral and 1 ground black and red are hot wite is nuteral and green is ground.
The connection on the back of the dryer will be white on the center screw, green to the frame of the dryer, and black and red to the outside screws of the terminal block, and it does not matter which color black or red goes to the left screw, or to the right screw, you choose
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On a 4-prong power cord you have 2 hot wires, one neutral wire, and one ground wire. On a three prong cord, you have 2 hot wires and one neutral/ground wire. The difference is the on four prong the neutral wire goes to electrical neutral bus in the breaker panel and the ground wire goes to the ground bus in the breaker panel. Since the neutral and ground buses, although separate, both go to physical ground, on a three-wire setup, you are just putting the neutral and ground wire together, Most dryers actually have a place at the pigtail connection to do just that.
You can change the cord or the receptical...
It will be easier to change the cord...
Purchase a four prong plug cord that will fit into your receptical, then wire your dryer for 4 wire instead of three wire use.
To see a picture and explanation of how to wire your dryer for a 4 wire plug go to the following webpage.
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Your four prong cord has 4 wires. Black,Red,Green and White. Remove the 3 prong cord from the dryer. The
Black and Red wires go to the outside terminals on the dryer. The White
wire goes top the center terminal. The Green wire goes outside the
terminal cover to any nearby screw for grounding.
best bet would to be to buy a plug that matches your receptical.....this is somthing you do not want to monkey with as if not wired right could turn your dryer into a fire hazzard. white to white green to green black to black and the other wire goes to earth ground for like trailer houses and modular homes.
My guess is that you are installing a dryer in a mobile home. National Electrical code requires them to have a 4 prong receptical. Red and Black provides your 220 VAC, the White wire carrys the Neutral side for 110VAC functions. And the Green provides the appliance ground.
Well a dryer works off of 240 Volts. It splits that up. The light in your dryer uses 110V but the heating elements use 240V. The motor which won't start uses 110V and the controls use 110V. There could be a couple prolems and of which it could be. You need to get a meter and check that both leads are getting 110V from each hot lead to neutral. Also when you switch back to a three prong, the ground is no longer separate and you need to jumper the ground to the neutral terminal. (When you have a four prong cable the ground is separate for the fact that its safer). Even if the circuit breaker is on, I would check that each terminal of the breaker is putting out 110V to ground (If so it needs to be replaced, its simple to do just wire it like the other one, and turn off main power to replace it so there is no power to the buss bar its attached to. Just be careful not to touch the main feed wires to the panel as they are still powered). If none of this pans out, it could also be that your dryer needs that four wire plug (I would check with your manufacturer). Either way, if your dryer worked before it shouldn't be a dryer problem now
The 3 prong plug on your dryer is configured with 2 lines of power and 1 ground. The 4 prong receptical is 2 lines of power, 1 neutral, and 1 ground.
You will have to turn off the breaker to see how the receptical is wired by pulling it out and looking at it. You can then buy a 4 prong plug to match it and only wire up the 3 prongs you need for your dryer and leave the 4th prong empty.
the red wire to red black wire to black white wire to white and disconect the ground wire to the white lug and conect the green wire to the screw that is on the other end of the ground strap you disconected from the white lug