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I have a 250 volt outlet for my dryer, should it have a ground? there are only 2 wires going to it now. there is a black wire but it is connected to nothing

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Hi, Yes, by all means you NEED a ground wire... very unsafe condition!!
Here is a tip that will help you Dryer Cord and Wiring Dryer 3 Wire or 4 Wire


Posted on Nov 10, 2010

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  • nickallenker Nov 10, 2010

    Thank you very much but I am talking about the actual wall outlet, it is 3 prong but it only has 2 wires connected to it. there is a black wire but it is connected to nothing. It is an old house, built in 1948. My dryer is running but has stopped heating, wondering if this has anything to do with it. Already checked out the element etc... they all check out.

  • D. Floyd Kolb
    D. Floyd Kolb Nov 10, 2010

    No the ground will not make it stop heating.....if it is gas... I am a bit confused as to whether you have gas or electric....di you mean the ignitor when you talk of the "coil"?

    That can glow and still not trip the gas valve...

    Still should get that ground koohed to the outlet though...

  • nickallenker Nov 10, 2010

    It is electric.

  • D. Floyd Kolb
    D. Floyd Kolb Nov 10, 2010

    Okay I think I got ya now.... Yes the black wire needs to be connected to the wall outlet and yes that will stop it from heating....
    The red wire should go to one side of the outlet the bare or ground wire to the center prong and the black wire to the otherside of the does not matter which side the red and black go to as long as the ground is on the center and they are on each side...

  • nickallenker Nov 11, 2010

    Thank you very much! That was the problem. The dryer is now up and running!

  • D. Floyd Kolb
    D. Floyd Kolb Nov 11, 2010

    Great!! Glad to help!!



If you have 12/3 or 10/3 with a ground,the ground will be attached,and you will have an extra unused conductor

You need 12/2 or 10/2 only.

By code you ground everything,but you know that.

The bare cooper wire is the ground,unless you got some old BX Metal Cable. Loose that, and use Romex, unless you have a location where it will come in contact with some moving object.

All appliances have to be on their owe circuit.

Posted on Nov 10, 2010

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Yes you should always use a ground for safety with no ground referance your dryer could short out enternally and the whole dryer could become energized and when you touch it you would complete the circuit and could be electricuted resulting in serious injury or even death.

Posted on Nov 10, 2010

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How to connect a dryer

Hi Sheliah,

I'm an electrician and would like to help you. Assuming you're in the U.S. and this is an electric dryer (not gas), you will need to find a 240 (a.k.a. 250) volt / 30 amp circuit to connect it to for it to work. This would be connected to a double pole 30 amp circuit breaker in the electrical panel. There is no simple residential "adapter" to change voltage, current or number of wires - besides the old 3 wire grounding plug adapter in you grandmother's junk drawer. (What is a 50/250 volt dryer? - did you mean a 30A/250V?)

Your dryer should have a 4 wire cord with a 4 prong plug on the end - and it will need to be plugged into a matching outlet. The old electrical code allowed you to change the cord to match the outlet, but now it requires that both the cord and the outlet be a 4 wire type. The old 3 wire cord type is no longer permitted to be used when the dryer is moved or replaced. Of course, 3 wire cords are available everywhere and it is unlikely that anyone will turn you in for changing the dryer's 4 wire cord back to a 3 wire cord type (but I just wanted to tell they way it is supposed to be done). What you do - is your business.

If you have a gas (or LP) dryer, you probably only need a 120 volt / 15 or 20 amp outlet - they look like the standard types - but I think you'd have simply plugged it in and walked away if that were the case.

I hope this helped!

Apr 07, 2014 | Dryers

1 Answer

Can i change the plug socket over from 110v to 240v supply on my HR2470T-1/1

It would not be OSHA approved if in the US in an industrial location.

While not recomended practice, it can be done in the US to run off of 4 wire 240. You are just connecting to one half of the 240 outlet.

If you are in the UK or elsewhere with 240/250 volt mains- do not do this, use a voltage reducing transformer instead..

In the US, the standard is 120 /240 Or put another way- a 240 volt circuit in the home in the US, has 2 120 volt branches that share a common return, the 240 is derived across the 2 "120 sources"- hence your 2 pole breakers on 240 volt branches. If the socket is 3 terminal- which was old code- ground and the return were common at the outlet, it is a matter of just making sure the 240 volt plug terminals the 120 volt drill gets attached to is the ground/return (the one with the nib on it to make it index correctly in the outlet- (should be the wide blade lead or white and one black in the drill goes to either"hot" side of the plug- either one will work, and only one. On a 4 wire outlet, which is new code- the return goes to the white wire of the drill. And the black goes to either one of the hot sides. If drill has conductive case and grounding wire- that should connect to the outlet ground.

Mark on plug which two blades are used, so if you take it somewhere else, you can check (which should be standard operating procedure) with a meter to make sure their outlet is wired correctly.

Feb 11, 2012 | Drills

1 Answer

I have a 240 volt air compressor. I have had it wired with a three prong dryer cord wich consists of a white, black and green wire. There is only a place on the compressor for these 3 wires. The problem I...

You are going to have to abandon one of the wires and probably change your outlet to match your cord. I would abandon the red wire. You will have to do this in the breaker panel itself. If you are not familiar or comfortable working in this panel then don`t. If you are then only connect the white and black wires to the breaker that feeds your outlet and your green will be your ground which should already be connected to the ground bar. It is possible that the black and red wires are already connected to the breaker and the white to the neutral bar (this is the way it should have been wired for four wires). If this is the case just remove the white wire and tape it off and don`t use it in your new outlet.

Feb 15, 2011 | Fahrenheat Electric Hydronic Baseboard...

2 Answers

I have a roper dryer 4 cycle model # rex4625ew1..I recently moved into a mobile home and I changed my plug from a 3 prong plug to a 4 prong plug..I did what the instructions said on the back of the dryer.I...

First, I'm confused about your dryer cord change. The green ground wire should NOT be connected to the neutral terminal block - but rather stay connected to the dryer cabinet. Here's a detailed link the describes (with photos) how to change a dryer's 3 wire cord to a 4 wire cord. This work should be double-checked to make sure you've done it correctly and have a safe installation.

Since you're not getting the dryer to run (you didn't say if it spins but has no heat or if nothing works at all) and you've checked the components of the dryer; the only thing left is to make sure there is 240 volts at the dryer outlet.

Make sure the power is ON. You should have either a 2 pole 30 amp circuit breaker or two 30 amp fuses that provide power to this outlet. Make sure the fuses are good / circuit breaker is ON (not tripped).

Do not touch a metal probe at any time that one is connected to the outlet in the steps below.

With a meter set to 250 volts or higher range - or a wiggy tester, slip each of the probes into one of the two straight blade openings in the outlet (use of a test lamp is discouraged as there is not voltage reading provided - it should only be used to indicate the presence of power). You should have a 240 volt indication (an indication of anywhere between 220 and 250 volts is acceptable).

Remove one of the probes and press it into the ""L" shaped opening; leaving the other probe in the straight blade opening. A 120 volt indication should be present (an indication of anywhere between 110 and 125 volts is acceptable for this and the following 120 volt measurements).

Remove the probe from the "L" shaped opening and press into the "O" shaped opening. Again, 120 volts should be indicated.

With the probe kept in the "O" shaped opening, remove the other probe from the straight blade opening and insert into the other straight blade opening. A 120 volt indication should be present.

Remove the probe from the "O" shaped opening and press into the "L" shaped opening. Again, a 120 volt indication should be present.

Remove the probe from the straight blade opening and press into the "O" opening. There should be a zero volt indication. A value of one or two volts is acceptable - but zero is expected.

If you get results that deviate in any way from those listed above, there is a problem with the circuit. An electrician should be called if the circuit breaker can't be reset or if fuses blow. If the voltages are indicating correctly but dryer still won't operate, there may be an issue with cord wiring or internal controls or safety devices inside the dryer.

I hope this helps. Please rate this reply - thanks!

Jan 04, 2011 | Roper REX4634KQ Electric Dryer

1 Answer

When I bought the dryer 18 months ago it came with a 3 wire plug and the green ground was attached seperately (not part of the plug). We just moved and the house has a 4 plug setup. I bought a 4 wire plug...

Good day,
You wired it correctly. The original setup you had, used a 3 prong, and the white wire could serve as a ground, since all green wires and white wires connect to the same place on the circuit breaker panel.
Adding an additional green wire from the cabinet to a grounding location, such as a bare cold water pipe is just added safety.
There might be something wrong inside the dryer, but to be safe, you should have the outlet checked, to make sure the white(common wire) didn't lift off ground potential, and you have a true 230 volts from red to black, and 115 from both white to red, and white to black at the outlet.

Dec 23, 2009 | Washing Machines

2 Answers

I have a wall outlet that is made for a 4 prong dryer and i have a dryer with a 3 prong, i went to the store and bought a new cord besides knowing its for a dryer do i need to know anything else, i bought...

When you put the cord on the dryer,the white wire goes to the center wire terminal. Black and red go to the 2 outside terminals right and left. The Green ground wire attaches to a ground screw outside the terminal cover.

Oct 08, 2009 | Frigidaire FEQ332E Electric Dryer

1 Answer

I just bought a used amana dryer that is 1 year old. it has a 3 wire pigtail and i have a 4 wire plug in and need to change out the pigtail. need some direction on if possible to change it out or will i...

Two options,

1) get a three wire outlet ("plug in")
2) get a 4 conductor cable.

The 4th wire is green or bare - ground the wire to the cabinet.

You are 'safer' with the 4 conductor wire. (In the past, White served as the neutral conductor and the case may have been 'bonded' to the white, providing a "ground". Today, I believe the code requires a separate ground. Even though the white and green join in the service panel and go both to ground and "back" to the utility, there is the possibility some installations are wired through a sub panel. Common use of white as neutral and ground is not allowed in a sub-panel in most jurisdictions). Black to black, Red to red, White to white and Green (or bare) to the frame. You can make a hole and connect it or use an existing screw that is nearby to make the connection.

If you have a volt meter, you can check your existing outlet. You should get 220 V between the two legs, 110 V between "red" and "white", 110 V between "black" and "white", 110 V between "red" and "ground", 110 V between "black" and "ground", and no reading between "white" and "ground".

The terminals on your existing outlet should be clearly marked and the color code of the wire should be clear although it is POSSIBLE the color of the conductors is all black. The above series of tests will help you determine what is what if necessary.

If you are still unsure, you should get the advice of a licensed electrician in your area (which I am neither)

I hope this helps you


Oct 04, 2009 | Dryers

2 Answers

Dryer outlet does not have common wire.

You can replace the 4 prong with a three prog cord found at Lowes etc.

First, disconnect the black wire, one of the "hot" connections, from the left side post by removing the terminal screw. This is one-half of the 240-volt connection.
Next, disconnect the red wire, another of the "hot" connections, from the right side post by removing the terminal screw. This is the other half of the 240-volt connection.
Then, disconnect the white wire from the center connection. It is used for the neutral connection.
Now, disconnect the green wire from the machine case by unscrewing the green screw.
The next step is critical to return your electrical connection to factory condition before installng the 3-prong cord! Locate the white machine wire that is now connected to the neutral (center) screw terminal. Disconnect it from there and install it under the green ground screw.Connect the outer two wires (hot wires) to the outer two screws, obviously, one on each screw.
Now connect the center wire (neutral) to the center post. You'll notice the white machine wire is now the case ground connection, unlike the 4-prong cord connection in which the green wire from the cord makes the ground connection.

Sep 10, 2009 | Dryers

1 Answer

Dryer is turning but no heat is coming out

If you had a 3 prong originaly you probably have only 3 wires to work with, either a red and black and white or a black and a black with a red stripe and a bare stranded wire. The black and red are ALWAYS the 2 hot wires 230 volt. The white or bare are the neutral / common wires. If you only have 3 you will need to get your equipment ground from a cold water line to the 4th prong.
Another option leave the 3 prong in the wall and install the old 3 prong pig tail on the new dryer then ground the frame of the dryer to the nearest cold water line. The water line must be metalic for this to work.

Mar 15, 2009 | Whirlpool Dryers

3 Answers

Connecting 240 volt singer baseboard heater

Need front grill for singer model WJA-12 wall heater Cat # 9756-A
single phase 60 HZ
240 volts 5.2 Amps
1250 Watts
Where can I find it?

Nov 28, 2007 | Heating & Cooling

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