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Old 07-01-2008, 10:12 AM   #1
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Romex NMB thinner jacket?


I recently purchased a 250' roll of Romex NMB 12/2 cable, and can't help but notice that the outer jacket is significantly thinner than that on some older (Cerex) NM cable.
Are there different grades of Romex? What's the scoop?

Thanks

FW

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Old 07-01-2008, 10:22 AM   #2
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Romex NMB thinner jacket?


I also have noticed that THHN has a thinner insulation. For example I must use my # 14 stripper slot for # 12. New strippers, good ones. I think they just get better and better with insulation. I also think the advent of compact conductors may play a roll in this.

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Old 07-01-2008, 02:48 PM   #3
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Romex NMB thinner jacket?


Yes, THNN insulation is a "hi-tek" thermoplastic which has better insulating properties than the older materials, but I am curious about the thickness of the outer jacket.
I liked the thicker jacketed "Romex" cables, as they were less prone to damage during installation.
That said, I have been very careful when pulling the new cable to avoid any problems.

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Old 07-01-2008, 10:23 PM   #4
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Romex NMB thinner jacket?


yes, new romex has thinner insulation then old stuff. Also new wire has thinner conductors then old stuff. New #12 is slightly smaller then older #12
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Old 07-01-2008, 10:41 PM   #5
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Romex NMB thinner jacket?


The cable is thinner due to higher temp insulation over each conductor as well as being covered with a nylon sheath. I think the paper fill has been removed with the newer insulation as well.
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Old 07-01-2008, 10:51 PM   #6
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Romex NMB thinner jacket?


Quote:
Originally Posted by jimmy21 View Post
yes, new romex has thinner insulation then old stuff. Also new wire has thinner conductors then old stuff. New #12 is slightly smaller then older #12
Thinner conductors, or just thinner insulation?
If the conductor were thinner than #12, it wouldn't be a #12, would it, since wire gauges are based on cross sectional area of the conductor.

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Old 07-02-2008, 12:34 AM   #7
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Romex NMB thinner jacket?


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Originally Posted by fw2007 View Post
Thinner conductors, or just thinner insulation?
If the conductor were thinner than #12, it wouldn't be a #12, would it, since wire gauges are based on cross sectional area of the conductor.

FW

not arguing with you on that. But the conductors on old tar paper romex #12s are deffinitly bigger than newer solid #12.
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Old 07-02-2008, 05:53 AM   #8
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Romex NMB thinner jacket?


If there is any difference, it would have to be minimal, as if it were alot smaller it wouldnt be 12 AWG anymore! If there were a difference, i'm sure that it would be hardly noticable to the naked eye.
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Old 07-02-2008, 10:58 PM   #9
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Romex NMB thinner jacket?


its very noticable. An old #12 is a bit bigger than a a new #12 but still not nearly as big as a #10
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Old 07-01-2011, 02:38 PM   #10
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Romex NMB thinner jacket?


I found that the neutral and ground wire are energized when the black hot wire is energized? Using Romex SMPULL Type NM-B 12/2 with ground. I ohmed out the wire and it ohms out good but when 120 volts are connected both the neutral and ground becomes hot??? Is this an induction issue? New wire no visible damage.
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Old 07-01-2011, 03:00 PM   #11
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Romex NMB thinner jacket?


Quote:
Originally Posted by Lindy65 View Post
I found that the neutral and ground wire are energized when the black hot wire is energized? Using Romex SMPULL Type NM-B 12/2 with ground. I ohmed out the wire and it ohms out good but when 120 volts are connected both the neutral and ground becomes hot??? Is this an induction issue? New wire no visible damage.
What type of meter are you using?
Are you floating the the ends of the white and ground?
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Old 07-01-2011, 03:01 PM   #12
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Romex NMB thinner jacket?


Quote:
Originally Posted by jimmy21 View Post
its very noticable. An old #12 is a bit bigger than a a new #12 but still not nearly as big as a #10
Any chance you could measure the copper wire with a micrometer so we could understand this better?
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Old 07-01-2011, 03:27 PM   #13
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Romex NMB thinner jacket?


This thread will be 3 years ol tomorrow!!

Happy Birthday!!!!!!
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Old 07-01-2011, 05:39 PM   #14
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Romex NMB thinner jacket?


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This thread will be 3 years ol tomorrow!!

Happy Birthday!!!!!!
Usually I watch the date but this one caught me.. Well, Lindy65 must have been doing some searching and found the tread and then responded with his/her issue. Let's see if Lindy65 returns with an update

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