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11-07-2007, 09:31 AM
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#1
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Wyome
Join Date: Jun 2007
Location: WY
Posts: 383
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minimun installation temp nm
I haven't seen it anywhere, but it seems reasonable to expect that there is a minimum temperature below which nm-b should not be pulled? Manufacturer specs? Certainly no nec requirements that I could find. I've found that at -20F to -30F the sheath can crack. Don't really like working that cold anyway.
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11-07-2007, 10:34 AM
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#2
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Ax grinder
Join Date: Jan 2007
Location: North Logan, Utah
Posts: 679
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I am not aware of any mandated ambient temperature limitation as to when you can or can't install NM cable. I would say use common sense, if the insulation is going to crack then it is probably not a good idea to install the NM cable.
Here in northern Utah the winters get pretty cold so I feel your pain. (When it gets to -20f you usually don't feel much pain.  )
Chris
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11-08-2007, 09:08 AM
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#3
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Wyome
Join Date: Jun 2007
Location: WY
Posts: 383
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Here in northern Utah the winters get pretty cold so I feel your pain. (When it gets to -20f you usually don't feel much pain. )
Chris[/quote]
Right. Sometimes you don't even feel your fingers.
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11-08-2007, 09:16 AM
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#4
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Seen your member
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 9,962
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I work in one jurisdiction that has a written code that NM cannot be installed in temps below 0°F.
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11-09-2007, 01:50 AM
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#5
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"Euro" electrician
Join Date: Mar 2007
Location: NE Wi / Paris France{ In France for while }
Posts: 637
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IMO for NM romex wires anything colder than 10°F i try to preheat it keep in warm place for while until that get warm then string it out soon as possible before the cold get it again.
just want to head up with the new Simpull THHN-THWN's and NM both stated that do not pull if colder than 10°F [ if i recall the instrucations stated that ]
i allready pull few NM's little colder than that and feel it get more brittle with it so kinda like judgement call on what you can do with super cold weather even in super cold room like industrail frezzer [ walk in or drive in type ] same thing too
Merci, Marc
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Pas de problème,il marche n'est-ce pas?"(No problem, it works doesn't it?) 
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11-09-2007, 05:47 AM
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#6
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Senior Member
Join Date: Jan 2007
Location: Baltimore, MD, USA
Posts: 3,486
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I sit here very thankful that temps that low are rare around here!
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John from Baltimore
"One day at a Time"
All responses based on the '08 NEC
It's not my fault, it's not my problem, I'm not your solution. 
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11-10-2007, 04:11 PM
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#7
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Senior Member
Join Date: Sep 2007
Location: Cocoa, FL USA
Posts: 625
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"I haven't seen it anywhere, but it seems reasonable to expect that there is a minimum temperature below which nm-b should not be pulled?"
Yea, it's 75 degrees F . . .
"I've found that at -20F to -30F" - are you daft, man?" 
Best Wishes
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Be Safe Out there
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11-10-2007, 08:58 PM
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#8
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Senior Member
Join Date: Sep 2007
Location: Delmarva, USA
Posts: 607
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BELOW 20F we have had the outer sheath of romex crack open when pulling it in.
Its time to go home at those temps, or get some heat source going ... 
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11-10-2007, 09:21 PM
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#9
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Senior Member
Join Date: Sep 2007
Location: Cocoa, FL USA
Posts: 625
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Been gone from Silver Spring, Maryland for forty years. Has it gotten that cold since I left. Brrrr . . .
75 degrees is my answer, and I'm stikkin' to it 
Best Wishes
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Be Safe Out there
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11-11-2007, 09:54 AM
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#10
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Member
Join Date: Apr 2007
Location: USA
Posts: 75
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Perhaps this is where "in a craftsman like manner" takes place.
If you pull it and inspect it and it is ripped, broken, or cracked.....you will be replacing it , that simple.
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11-12-2007, 11:56 PM
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#11
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Senior Member
Join Date: Nov 2007
Location: Chicago
Posts: 461
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Quote:
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I've found that at -20F to -30F the sheath can crack. Don't really like working that cold anyway.
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On the bright side, at that temp. I think it almost qualifies as a superconductor.
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11-13-2007, 10:00 AM
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#12
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Wyome
Join Date: Jun 2007
Location: WY
Posts: 383
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Quote:
Originally Posted by HighWirey
"I haven't seen it anywhere, but it seems reasonable to expect that there is a minimum temperature below which nm-b should not be pulled?"
Yea, it's 75 degrees F . . .
"I've found that at -20F to -30F" - are you daft, man?"
Best Wishes |
Apparently so.
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12-14-2007, 06:41 PM
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#13
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Senior Member
Join Date: Nov 2007
Location: Kendrick Idaho
Posts: 439
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Min Temp for NMB
In N Idaho if it is below freezing and no heat in building I look for cracking and separation of the outer insulation. If present I require replacement.
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12-14-2007, 07:21 PM
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#14
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Senior Member
Join Date: Mar 2007
Location: Leesburg VA
Posts: 6,510
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You'd hardly recognize downtown and up town you'd avoid.
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12-15-2007, 12:11 AM
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#15
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Mad Skills
Join Date: Nov 2007
Location: NJ
Posts: 1,191
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Quote:
Originally Posted by shazam
Perhaps this is where "in a craftsman like manner" takes place.
If you pull it and inspect it and it is ripped, broken, or cracked.....you will be replacing it , that simple.
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A little tape will fix ripped, broken, or cracked sheath on NM...no problem...just keep the tape warm in your pocket 
Quote:
39.
I have a Romex cable in a wall that got nicked. Only the outer sheathing was slightly damaged. Can I repair that damage with electrical tape and not replace that Romex cable?
Answer:
Although the purpose of the sheath of Type NM cable is to protect the inner conductors and Article 334 has requirements for the outer covering, there is no specific requirement to replace a cable assembly with a damaged outer sheath. Article 334 has requirements for protecting the cable from physical damage after it has been installed, and it is reasonable to assume that some minor damage will occur during installation.
Whether a length of Type NM cable must be replaced if the outer sheath is nicked will be a judgment call based on the extent of the visible damage.
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http://iaei-western.org/Files/2005/2...Code_Panel.pdf
There is a letter/document from Southwire that details the "process" to repair a damaged jacket on their NM product.
The link I had for it is 404.
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