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Old 12-13-2011, 08:48 PM  
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Originally Posted by kok328 View Post
And what makes you think the junction box is grounded ?
Good question. I am being told that in older buildings they are. However, I would like to make sure that this is the case.

How would I determine if the junction box is grounded?


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Old 12-14-2011, 04:43 PM  
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To check if a box is grounded, you'll need a voltmeter.
Put one lead of the meter to the known hot wire and the other lead to the junction box.
If the box is grounded, you'll get a reading of 110-120 VAC.
If the box is not grounded, you will get a reading of 0 VAC.
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Old 12-15-2011, 09:27 AM  
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Even with 120 volt reading it still might not be a valid ground by code. Certain types of armored cable will show a ground connection but are not valid grounds.
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