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Old 10-18-2012, 08:33 PM   #1
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NM-B Jacket Damage in Drop Ceiling


I just happened to be looking inside my drop ceiling in my finished basement and noticed that the jacket on a 14-2 (w/ground) NM-B wire had "split" open in several spots between two recessed cans and the paper wrapper was visible. I shut off the circuit breaker (15amp) and took out the one 6ft run to inspect it closer. I didn't see anything obvious outside of the damage to the jacket. The push-in connectors used in both cans all seemed good. I checked the rest of the basement and all the wire I can visually inspect seems to be in great shape. The cable is dated 9/12/04 and was installed in mid-2005. I do have forced hot air heating and the wire in question was split directly under the joist bay where it ran perpendicular to the duct. I have attached two photos of the wire in question. My big concern is that there was a short somewhere that heated the jacket and caused the damage.

Replacing the wire that is damaged is the obvious first step but should I be looking at replacing the two cans between the wires as well?
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NM-B Jacket Damage in Drop Ceiling-photo2.jpg   NM-B Jacket Damage in Drop Ceiling-photo.jpg  

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Old 10-18-2012, 08:38 PM   #2
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NM-B Jacket Damage in Drop Ceiling


That's not melted. It looks like mechanical damage, like it was pulled over a very sharp edge. It also could be a manufacturing defect. I really wouldn't worry about it. If the insulation on the conductors inside isn't damaged, just wrap it with electrical tape and leave it alone.

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Old 10-19-2012, 05:18 AM   #3
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NM-B Jacket Damage in Drop Ceiling


Damage from poor installation technique. Wrap it with some good electrical tape and call it a day.
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Old 10-19-2012, 07:59 AM   #4
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NM-B Jacket Damage in Drop Ceiling


I've seem Romex like that right off of the coil... a manufacturing defect. As long as everything inside is intact, not a problem.
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