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#91303 - 01/09/05 07:00 AM torque
kd Offline
Registered: 12/14/04
Posts: 52
When I torque lugs using Aluminum wire, I will apply, say 50 ft. lbs., then several days later check the torque. It will be down to, say, 35 lbs, so I re-torque it. Other ECs say you should just torque it and forget it--that the loss in tightness is built-in to the required torque. Of course Copper holds its torque so it is not a problem. What do you guys and gals say about this?
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#91304 - 01/09/05 07:47 AM Re: torque
Tom Offline
Registered: 01/01/01
Posts: 1044
Loc: Shinnston, WV USA
Torque it once to the specifications for the lug & leave it alone.
Few things are harder to put up with than the annoyance of a good example.
#91305 - 01/09/05 08:37 AM Re: torque
George Little Offline
Registered: 01/18/04
Posts: 1488
Loc: Michigan USA
How does an inspector know how much you've torqued a connection? I am a fan of the break away connection.
George Little
#91306 - 01/09/05 09:38 PM Re: torque
Physis Offline
Registered: 12/28/04
Posts: 86
Loc: Burlingame, Ca. USA
Another reason to not like aluminum as a conductor.
Sam, San Francisco Bay Area
#91307 - 01/10/05 04:13 PM Re: torque
John Steinke Offline
Registered: 04/03/01
Posts: 518
Loc: Reno,Nv., USA
Not "another" reason- THE reason! Aluminum is notorious for "creep" when over-torqued. Aluminum should not be torqued to the same values as copper for this reason.
Simply put, too much pressure causes the metal to flow, leaving you with a loose connection. Make sure the value you're using is the correct on, and not "something always used."
#91308 - 01/11/05 09:31 PM Re: torque
kd Offline
Registered: 12/14/04
Posts: 52
Aluminum association torque table shows the sasme values for Cooper and Aluminum.
#91309 - 01/17/05 05:24 PM Re: torque
Nick Offline
Registered: 08/13/01
Posts: 599
Loc: Riverside, CA
#91310 - 01/18/05 08:21 AM Re: torque
resqcapt19 Offline
Registered: 11/10/00
Posts: 2148
Loc: IL
The following is a very important quote from the document that Nick has posted a link to.
It is often asked whether bolted connections require periodic retightening. The simple answer is NO. Once the connector is installed with the proper torque, repeated tightening could actually damage the connector and/or the conductor and eventually lead to a failure.


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