HELP! Newly Installed METAL Junction Box Becomes LIVE!!! - Electrical - DIY Chatroom Home Improvement Forum


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Old 06-25-2012, 07:55 PM   #1
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


So I recently installed a NEW Metal Junction box (looks like this: http://www.homedepot.com/Electrical-...&storeId=10051) and I nailed it to a wooden stud in my basement. I use the yellow 12/2 Romex wire with ground. Coming in the box from the top is from the power source (A previous GFCI in the circuit) and I wire nutted the GROUND, HOT, and NEUTRAL securely to the complementary wires leaving the metal junction box to the new GFCI outlet. So everything is organized and there are no cuts or slits in the NEW Romex wire... BUT when I go back to the Breaker Panel, And I turn the power on, I use my NON-CONTACT VOLTAGE TESTER and test for any dangers.

The new GFCI works. HOWEVER,

my voltage tester beeps when I put it next to the METAL box. So I did not touch the box cause I was scared that it was LIVE.... I really don't know why it is live! So how can I find out if this new Metal Box is really LIVE and dangerous and not the voltage tester's error? (Obviously without touching the box directly with my fingers) THANKS!

Would replacing the junction box with a PLASTIC box work?

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Old 06-25-2012, 08:07 PM   #2
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


Just use a real volt ohm meter between the white and the box and see what happens.
Most likly your just picking up a false signal.
I almost never use steel boxes anymore. Cost more, and with plastic there's less chance of a short.

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Old 06-25-2012, 08:12 PM   #3
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


Non-contact testers let you know if there is power in the vicinity of the wiring....no more, no less. You need a real tester as well. I'm not knocking non-contact testers...they have a purpose in signaling the alarm that a live circuit is present.
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Old 06-25-2012, 09:21 PM   #4
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


you also need to ground metal boxes.there is a hole to accept a 10-32 ground screw.pigtail and attach ground wire to box.did not see where you did that.
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Old 06-26-2012, 04:30 AM   #5
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


While the non-contact tester may be giving a false reading, it should not be doing so when near a grounded metal box. Make sure the box is grounded - your description did not mention that. Also, you do not need a GFCI receptacle if it is being fed from another GFCI receptacle. Just feed it from the load side and it will be protected.
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Old 06-26-2012, 06:22 AM   #6
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HELP! Newly Installed METAL Junction Box becomes LIVE!!!


A beep tester can show a false positive when the grounding conductor is broken, and induction picks it up.

A real tester is needed here to determine the actual problems ...

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