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Old 08-13-2013, 10:34 PM   #1
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


I've tried using a receptacle tester, but figured out this does not work properly without a true ground hooked up to the tester. I know I can test if a 3 prong is wired properly by using a voltmeter with a test lead on the smaller slot (hot wire) and the other test lead to the ground prong. However a 2 prong receptacle does not have a ground. So I was thinking of plugging in a 100 feet extension cord in a working 3 prong receptacle, and use that ground. I would use the voltmeter and put a test lead in the smaller slot of the 2 prong receptacle and put the other test lead in the ground of the extension cord. Would this be a reasonable way to test if a 2 prong receptacle is wired correctly? Thanks in advance.

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Old 08-13-2013, 10:44 PM   #2
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


Sometimes the older outlets are in metal boxes and can sometimes be grounded in the box by bx or hopefully not a bootleg ground. You could try going from the hot to the faceplate screw, or take the plate off and go from hot to the box. If that doesn't work, then use the extension cord ground

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Old 08-13-2013, 11:59 PM   #3
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


Your method should work.
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Old 08-14-2013, 06:22 AM   #4
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


This is a good job for a tick.
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Old 08-14-2013, 07:18 AM   #5
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


piping baseboard and or even radiators for a ground to see which is hot or neutral on the meter read
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Old 08-14-2013, 08:01 AM   #6
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


Exactly what are you try test for on a two prong receptacle? There is no ground. One prong is not bigger than the other. The best test is to plug in a lamp and see if comes on.
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Old 08-14-2013, 08:19 AM   #7
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


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Originally Posted by joed
Exactly what are you try test for on a two prong receptacle? There is no ground. One prong is not bigger than the other. The best test is to plug in a lamp and see if comes on.
Many two prong receptacles are polarized and a check to see if they are wired correctly is sometimes called for. The extension cord method is the most reliable, a "tick tester" may work, but is not as reliable.
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Old 08-14-2013, 09:13 AM   #8
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


Quote:
Originally Posted by joed View Post
Exactly what are you try test for on a two prong receptacle? There is no ground. One prong is not bigger than the other. The best test is to plug in a lamp and see if comes on.
On my receptacle is there is hot smaller slot and a larger slot. I was reading this article....

http://www.structuretech1.com/2009/0...arity-outlets/

and decided it was worth to make sure all my receptacles are wired correctly.

Last edited by stanlam; 08-14-2013 at 04:54 PM.
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Old 08-14-2013, 04:41 PM   #9
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


OK if you need to test the polarity the extension cord or to the screw holding the cover on if it happens to be grounded.
However the hot should be the smaller slot.
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Old 08-14-2013, 04:55 PM   #10
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How do I test if a 2 prong receptacle is wired correctly without taking it apart?


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OK if you need to test the polarity the extension cord or to the screw holding the cover on if it happens to be grounded.
However the hot should be the smaller slot.
That's right, the hot is the smaller. Thanks!!!!

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