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Old 12-27-2007, 07:54 PM   #1
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Non-grounded outlet

I have a question...I am buying a house that has a three prong outlet that is not grounded (ground vault indicator test). What could be the reason for this? All the other outlets are OK.


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Old 12-27-2007, 09:31 PM   #2
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What is a "ground vault indicator test"? Need more info...could just be a loose connection of the ground wires in the circuit before it gets to those outlets.


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Old 12-27-2007, 10:12 PM   #3
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It could be a couple of things. If it is an older home, ( by older I mean 19th century) it may be knob and tube wiring. The entire system has no raceway and no ground. If it is a home of more recent vintage, it may be a receptacle that has a loose or disconnected ground. Or it may be a DIY job that was botched along the way. Open it up and look into it. Let us know what you find.
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Old 12-28-2007, 06:49 AM   #4
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Check the ground connection. Some people like to just twist the grounds together with no crimp or wirenut.
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Old 12-28-2007, 08:47 AM   #5
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1. Flexible metal sheathed cable (such as BX) with two conductors inside is often passed off as grounded but it is not unusual for the bonding to be lost because the ends of the cables were not adequately clamped onto the junction boxes.

2. Twisted-only ground wires from Romex cables were common even into the late 20'th century. (My house was built in 1985 and has this.) Supposedly there were "twister tools" to get a better bond than hand twisting although I would not say that everyone used them.
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Old 12-28-2007, 11:49 AM   #6
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You may have only two conductors feeding the outlet. Maybe someone put in three prong and only had two wires. Look inside the box.


If it worked before you worked on it. You did something wrong.
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