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#81028 - 06/16/02 11:51 PM Torque Specs  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
I've got a Klein torque screwdriver on order, how do I find out the torque specs of various and sundry equipment?

No problem on service equipment and CB's, it's plainly written on a label in the enclosures somewhere and on the CB's themselves...

But switches and recepts are another matter... Nothing on the boxes or devices themselves that I've seen...

Any help?

[This message has been edited by sparky66wv (edited 06-17-2002).]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

2017 / 2014 NEC & Related Books and Study Guides

#81029 - 06/19/02 11:23 AM Re: Torque Specs  
WNYJim  Offline
Member
Joined: Jun 2002
Posts: 39
Rochester, NY, USA
The only torque specs for a duplex receptacle that I could find was on the Leviton web site (www.Leviton.com). This is the statement from their spec sheet for the 5262-IG Receptacles –
Designed torque capability of +20 inch pounds.


#81030 - 06/19/02 03:53 PM Re: Torque Specs  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
You have torque figures marked on some devices these days??! Wow!

I have to work to the principle: If the screw head shears off, it's too tight. [Linked Image]


#81031 - 06/19/02 04:29 PM Re: Torque Specs  
motor-T  Offline
Member
Joined: Nov 2001
Posts: 280
Girard, Ohio, USA
Sparky66
I have had mine for about a month now and Dont leave home without it.
In fact there is a list of torque specifications in the code. On Hubble receptacles they recommend between 9-12 in-# or 1.0-1.4 N.M
I found that the screwdriver is invaluable especiallly doing services, and it amazing how much you over tighten things, especially devices .
I usually use Siemens and for the smaller breakers 15-50 they recommend 24 in-#, and on all the liturature inside the cabinent it list tightening torques.

Paul of the UK
On the Siemens Breakers its right on front cant see it without a magnifier or lots of light, but all the manufactures have a torque specification, Square-D recommends I think 35in-# for its breakers.
Anyways I am sold on it.

I like your priciple, thats sort of like the one that states, Tighten a screw all the way down til it wont go any more, then one full turn.
-Mark

[This message has been edited by motor-T (edited 06-19-2002).]

[This message has been edited by motor-T (edited 06-19-2002).]


#81032 - 06/20/02 09:32 PM Re: Torque Specs  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Thanks for the replies!


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#81033 - 07/04/02 04:41 PM Re: Torque Specs  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
So, now I've had my torque screwdriver for a couple of services, and a torque wrench too.

The service I put in last week was the first I had installed "properly" using the torque specs listed in the panels and on the CB's. I have been over-tightening the lugs (250 in-lbs), busses and breakers (20 to 30 in-lbs), and probably not getting the EGC and range wire neutral tight enough on the bus (35 in-lbs).

However, upon inspection, the inspector breaks out his 3/8" allen wrench and procedes to tighten my work another quarter of a turn!

Plus he said that he likes to see the slots and edges buggered-up so he can tell I got 'em tight enough. I explained that I had torqued them to specs, (and had spent $130 on a screwdriver and $85 on a wrench so I could) and I didn't really think it was good to retorque terminals. (You'd eventually cut them in two, wouldn't you?)...

After a glare or two, he replied "they loosen up anyway..."

And I left it at that.

At least this inspector quoted 250.66 to let me know that I "could've" used #6 for the EGC instead of #4 if I had wanted.

Monday I have another inspection with another inspector.

How do I convince him that "I've torqued to specs and please don't touch my work" in a nice way?


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#81034 - 07/04/02 04:56 PM Re: Torque Specs  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
Sparky,
OK, the guys an idiot. You DON'T overtorque. Make little black checkmarks on the bolts that you torque as you torque them. If the inspector knows anything, he'll recognize that as tester marks.


#81035 - 07/04/02 05:18 PM Re: Torque Specs  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Um... Interesting story I had forgotten about:

The Inspector I'm using on Monday has at one time broken a lug on the meterbase checking the "torque"... I think he learned his lesson that way, but I still wonder if he understands the whole issue like you gurus do...

Maybe if I could explain in a scientific way why it is bad to overtorque and re-torque, my argument would have more weight.

George, may I trouble you (or anyone else) for a deeper explanation?

[This message has been edited by sparky66wv (edited 07-04-2002).]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

#81036 - 07/04/02 07:25 PM Re: Torque Specs  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
"...inspector breaks out his..." WTF? A building inspector modifying others’ work? What a d!pshit. Do his superiors know about this behavior? {The felt-pen marks are a good idea.}

Maybe the next time he'll tear out all yer #12 and replace it with #10.

The guy reminds me of some pathetic dad in the bleachers at little-league games who yells at coaches and umpires about his kid, trying to make up for his own twisted victimization in childhood.

He must have failed miserably as a tradesman and is now self appointed to compensate for all the shoddy workmanship he perceives. {Some loctite in setscrew threads may cause him to eventually loose interest in sainthood.}

He could get suicidal if you set up a pull section with ½-inch 2-bolt hydraulic-compressed lugs and bellevilles, or, better yet, 5/8-inch dragon-tooth washers.


#81037 - 07/05/02 02:33 PM Re: Torque Specs  
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Many thanks to Joe T. and George C. for sending me various and sundry torque specs as I requested... Great! I've got the tools and the specs, now I need the "theory" to back me up...

Let me ask a few Q's to let you know what I'm looking for now:

If/when the inspector or any other "authority" has the opinion that torquing to specs isn't tight enough, and claims that the terminals loosen up anyway, and later need re-tightened (read: retorqued)... What the heck do you say to them?

What happens to properly torqued lugs over time (Especially with Aluminum Conductors)?

What happens to an over-torqued lugs over time as compared to properly torqued lugs?

What happens to re-torqued lugs over time as compared to properly torqued lugs?

What happens to under-torqued lugs over time as compared to properly torqued lugs?

When I'm out in the field trying to give my viewpoint to those who disagree, I tend to give the impression that I'm "hung-up on code" to the point of being unproductive, but yet when I'm here on ECN, I have the feeling that I'm on the other end of the spectrum as a jack-leg weekend-warrior compared to you "heavy cats" (musical term, it's a compliment...).

[Linked Image]

Either George or Watt Doc, or somebody here once said: "The problem with electricity is that it almost always works."

Boy, is that ever right.


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

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