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#6227 - 12/26/01 08:41 PM Wire Torque
Nick Offline
Member

Registered: 08/13/01
Posts: 603
Loc: Riverside, CA
This question is really aimed at Don (Rescpt19) due to past posts on the subject but anyone with info please chime in!
I am starting a new job that had this requirement in the specifications.
Within 15 days prior to store turn over, re-torque all bolted wire connections in panels and switchboards, in compliance with applicable NEC requirements. Record date, connection location, and torque applied.
We’ll, the NEC doesn’t have any requirements to “re-torque” connections and according to Don it is a very bad practice. What I am wondering is if there is any published data on the consequences of re-torqueing wire connections and the effects it can cause. If I refuse to do this I will need some solid back up. Thanks.

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#6228 - 12/26/01 10:21 PM Re: Wire Torque
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
I'm also interested in any ammo to help persuade...

It is common practice for the AHJ's around here to insist upon retorquing when an anti-oxidant has not been used (to apply said "noalox" or "penetrox"). I got a strange look when I asked if he made them cut and re-strip the wire to torque on "virgin" conductor... (sigh)

Lots of DYI work here and the AHJ is usually just happy to see line and load in the right places...

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#6229 - 12/27/01 03:57 AM Re: Wire Torque
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Virgil,
"DYI" referring to "Do Yourself In"?

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#6230 - 12/27/01 06:25 AM Re: Wire Torque
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Nick,
I have been told it is a bad practice, but cannot find any published documents to back up what I think that I was told a number of years ago. Maybe I'm just wrong on this point.
Don(resqcapt19)
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#6231 - 12/27/01 08:55 AM Re: Wire Torque
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Hee hee... Oooops Typo...
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Residential/Commercial Inspector
5 Star Inspections
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#6232 - 12/27/01 10:49 AM Re: Wire Torque
WARREN1 Offline
Member

Registered: 05/09/01
Posts: 184
Loc: Greenville, SC, USA
Nick
Ul Standard 486B, Table 1.3 through 1.6. These torque values are used when testing wire connectors, unless the manufacturer assigns another value appropriate for the design. These values are for guidance only if no tightening information is not available on the specific wire connector.
In your case, I think the requirment is written into the specifications so the values will be checked. You don't want to have a loose wire in a connector. Just set your torque wrench to the proper value, then check each one to insure they are all tight. If I were doing the project, I would only hand tighten each connection the first time through, then torque to the proper value on the second time around, noting the values for each one. Your obligation would then be properly fulfilled without overtorque on any connector.
We have this same statement in some of our specs, and I have never given it much thought until I read the thread on this BB. I will re-word my specs to account for this from now on.
Just a thought from the designer.

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#6233 - 12/27/01 02:46 PM Re: Wire Torque
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
"Do Yourself In" -- I like it!

As opposed to DIY which really means "Destroy It Yourself."

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#6234 - 12/27/01 04:24 PM Re: Wire Torque
Nick Offline
Member

Registered: 08/13/01
Posts: 603
Loc: Riverside, CA
Thanks guys, for the reply's.

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#6235 - 12/27/01 05:26 PM Re: Wire Torque
motor-T Offline
Member

Registered: 11/10/01
Posts: 293
Loc: Girard, Ohio, USA
I have seen on meter bases especially, a torque spec for different size wire etc. Does anyone really use a torque-wrench ?

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#6236 - 12/30/01 12:22 PM Re: Wire Torque
ElectricAL Offline
Member

Registered: 10/10/01
Posts: 615
Loc: Minneapolis, MN USA
Yep.

Inspectors up here expect to see one out if they come on site while the meter socket connections are being made.
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