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05-25-2009, 06:45 AM #1
old 3 prong dryer receptacle to new 3 prong dryer receptacle
I live in a very old building...I have a old 3 prong dryer receptacle that has a white wire, a black wire, and a bare copper wire...I need to change dryer receptacle...I am concerned about the copper wire...I know to place white where noted...and black can go straight across..my concern is the copper wire...can I place copper on bottom where outlet hole is different without any problems? receptacle is showing 247 on meter
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05-25-2009, 07:28 AM #2
Re: old 3 prong dryer receptacle to new 3 prong dryer receptacle
Last edited by Scott Patterson; 05-25-2009 at 08:38 AM.
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05-25-2009, 08:25 AM #3
Re: old 3 prong dryer receptacle to new 3 prong dryer receptacle
First, why do you need to change the receptacle? Installing a new dryer with a new dryer cord? If so, get a dryer cord which matches your existing receptacle.
Second, do not change your receptacle to anything other than another 3-wire dryer receptacle DO NOT change it to a 4-wire dryer receptacle.
receptacle is showing 247 on meter
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05-25-2009, 08:43 AM #4
Re: old 3 prong dryer receptacle to new 3 prong dryer receptacle
If you have a panel in that room or nearby you could have a new 4-wire cable pulled and install a new safer four prong outlet.
Tell the building owner that he needs to have the whole building inspected (which I would be glad to do).
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05-25-2009, 02:14 PM #5
Re: old 3 prong dryer receptacle to new 3 prong dryer receptacle
Hi. If you only have three conductors (black, white and bare copper), the black and white are likely phase conductors and the bare is being used as a ground/neutral. This can be verified by a nominal voltage around 240 VAC between the white and black, and 120 VAC from black to bare and white to bare. If you must replace the outlet, use another 3 wire dryer outlet----it should be identical. DO NOT connect the existing wiring to a 4 wire outlet. Mr. Peck had the best advice, simply replace the cord on the dryer. If it is a new dryer, there should also be a bonding strap placed between the neutral and ground connections at the power connection area in the back of the dryer, if it is factory shipped with the jumper disconnected (4 wire connection). The installation literature should have instructions for this. Best wishes, GM
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