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Old 02-28-2013, 02:23 PM   #1
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Default Aluminum torque spec?

What is the proper tightening specs on lets say a meterpan and main breaker panel for Al conductors. I have been using my impact gun for both and just wondering if overtightening is possible, to date since 2003 I have not heard of any of my terminations failing.
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Old 02-28-2013, 02:30 PM   #2
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I'm used to seeing the torque specs on a data plate provided with the equipment.

And, yes, you can over-tighten a connection. As far as the manufacturers are concerned you have overtightened the connection as soon as you exceed their torque specs.

Pete
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Old 02-28-2013, 02:34 PM   #3
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isn't it written right on the can ?

read these articles, especially the 2nd on:

http://ecmweb.com/contractor/do-you-have-calibrated-arm

http://www.iaei.org/magazine/2010/07...m-reliability/

heres and old schneider torque list, I'm sure you can find one from the manuf of the can you are using or the lug manuf if you look.

http://static.schneider-electric.us/.../1600PN119.pdf

heres a newer one from ilsco:

http://www.ilsco.com/torqueinformation.aspx

ge:
http://www.geindustrial.com/publibra...GET-2779KB|PDF
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Old 02-28-2013, 02:48 PM   #4
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There are torque tables in the 2011 NEC annex I
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Old 02-28-2013, 04:59 PM   #5
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I've broken a fiberglass insulating part that holds the lug/ jaw in a meter. With an Allen wrench.
I think you would be suprised at how much over the torque, most electricians tighten the connections.
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Old 02-28-2013, 05:52 PM   #6
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Quote:
Originally Posted by wildleg View Post
isn't it written right on the can ?

read these articles, especially the 2nd on:

http://ecmweb.com/contractor/do-you-have-calibrated-arm

http://www.iaei.org/magazine/2010/07...m-reliability/

heres and old schneider torque list, I'm sure you can find one from the manuf of the can you are using or the lug manuf if you look.

http://static.schneider-electric.us/.../1600PN119.pdf

heres a newer one from ilsco:

http://www.ilsco.com/torqueinformation.aspx

ge:
http://www.geindustrial.com/publibra...GET-2779KB|PDF
From what I see Cu requires more tightening than AL. I always figured it was the opposite way around.
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Old 02-28-2013, 08:29 PM   #7
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Look at the tool bag thread and you will see most folks carry fold up hex sets or T handle hex's.

You bet, everyone is torquing to the manufacturer's spec.

If it looks like and smells like... well you know...
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