6/2 copper NMW-10(NMW-U) got flooded for 1 month on the coil - Electrician Talk - Professional Electrical Contractors Forum
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Old 05-27-2019, 12:40 PM   #1
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Question 6/2 copper NMW-10(NMW-U) got flooded for 1 month on the coil

Hello,
i have a 6/2 NMW-10(NMW-U) that got flooded with soft water for a month in a bunker.


The visual of the wire is very good, the insulation is ok without any crack and still very flexible.


The two extremity of the cable was bare copper and there is no corrosion on them.


i'm wodering that probably the water fill the whole cable by capillarity and may have created some corrosion on a part that i cannot see.


if the resistance of both wire are the same to both end, even with the wire in parallel, can i call this wire still good to go or you will do more test and if so what test ?


thank you and have a good day!
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Old 05-27-2019, 02:47 PM   #2
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Megger? There is also a big diggerence between NM getting wet, like fresh rain water from an incomplete roof and actually submersed in softened water. I don't think I would trust it.
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Old 05-27-2019, 03:00 PM   #3
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Wet NM has to be replaced.

The paper jacket acts like a wick.
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Old 05-27-2019, 04:09 PM   #4
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NMWU is rated for wet location u/g direct burial.
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Old 05-27-2019, 05:02 PM   #5
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Quote:
Originally Posted by MikeFL View Post
NMWU is rated for wet location u/g direct burial.
Never knew they made it.

Strictly a Canadian thing?
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Old 05-27-2019, 05:09 PM   #6
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NMWU = UF cable. Assuming it's the same stuff and construction, I wouldn't worry about it being wet.
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Old 05-27-2019, 05:42 PM   #7
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If it's Canadian NMWU, there is no paper inside the jacket. The filler is talc.
If it was for myself , I would probably use it. For a customer, I wouldn't take a chance. Buy a new piece
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Old 05-27-2019, 10:01 PM   #8
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Do you know an electrician that you could ask to see what he thinks ?

I wouldn't take chances if it were my place !!!!

Not sure what province your in, but in Quebec, the NMW there is not water protected like it is in other provinces ... so beware !!
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Old 05-28-2019, 12:54 PM   #9
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NMW-10 is the old name if NMWU (UF-B)
I am a tech in electric so just want other thinking then mine on this. I also show it to a friend a construction electrician and he think like me, as its for my self, try it and youll see! I will put it in a conduit so if some thing happen then i will replace the wire sell it for cooper and buy a new one.

Thank you all for your time ill get you in touch if everything run ok when my heat pump arrive!

Have a good one
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