Foot pounds of Torque for breakers and lugs.

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We had a 3/4" drive torque wrench at the amusement park, we used it once a month to check the torque on a certain main bearing. The setting was 400 Ft Lbs and it had to be done from a bucket truck, even with about a 4' long wrench it was a major pain. I have no doubt the tool was more then $600
 
iwire said:
We had a 3/4" drive torque wrench at the amusement park, we used it once a month to check the torque on a certain main bearing. The setting was 400 Ft Lbs and it had to be done from a bucket truck, even with about a 4' long wrench it was a major pain. I have no doubt the tool was more then $600
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How'd that work out? Seems like you'd need to start pulling on the wrench from 4 feet away, since I'm sure you could move the boom that much when you pull to get 400 ft/lbs. Was that the case?
 
mdshunk said:
I'll have to take your word on that. :) All I know about engines is that they're under the hood.
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Here's a nice little spring for you.:D Part of a draw collet mechanism. The spring holds the part during a lapping operation. It's uses a 6" diameter dual-piston air cylinder to unclamp the part. It takes a special tool to compress and decompress that dude! How have no idea what the rate of that spring is but I've worked with bigger ones.:rolleyes:

03-16-07_1137.jpg
 
mdshunk said:
How'd that work out?
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A major pain, it was a fiberglass boom bucket truck and flexed a lot.

This was the ride

get_image




The 4' diameter slewing bearing is located on the red part just under where the yellow sweeps attach to the center.
 
I like to hear from one of our resident inspectors as to how they go about checking torque specs.

I you set a torque wrench to the spec setting and applied that to a termation, etc., if it moves, it's undertorqued but if it doesn't, that could mean that it's overtorqued!

The talk was that too high of torque was just as bad as not enough.
 
quogueelectric said:
It was at that point that I realized that I didnt want a pickle I just wanna ride my motorcycle. ONLY THE OLDER GUYS will remember this one. Arlo Guthrie
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and I don't want to die

I just wanna ride on my motorcy....

cle!
 
wptski said:
I like to hear from one of our resident inspectors as to how they go about checking torque specs.

I you set a torque wrench to the spec setting and applied that to a termination, etc., if it moves, it's undertorqued but if it doesn't, that could mean that it's overtorqued!
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There is no way to check the torque on wire connections.

Every time you check it you will get more out of it, eventually you will crush the conductors.
 
Some companies require periodic calibration certification of torque wrenches. That would be nice to have on hand for the inspector.

Once, I was in big gear where the torque spec sticker was hard to see and I saw 3/8" on the chart and used that spec. Well, it was 3/8" socket head size not 3/8" bolt size! I would think the actual bolt size should determine the torque spec, not the wrench size or type (i.e. socket head or hex head)
 
iwire said:
There is no way to check the torque on wire connections.

Every time you check it you will get more out of it, eventually you will crush the conductors.
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So "everytime" you check to see if a wire is loose, it always is? Because that's what your actually saying. You "can't" retighten a wire connection because it'll always be loose??:confused:
 
One of our customers requires that we torque at least 10% of our connections in front of their inspector. We usually are adding 1 or 2 circuits to a panel so we just leave the wires loose until they show up and torque them down when they show up. They ask to see the breaker torque rating, see what you tool is set at, and make sure you torque it.

In this case, the Owner is the AHJ. Indian Casino
 
wptski said:
So "everytime" you check to see if a wire is loose, it always is? Because that's what your actually saying. You "can't" retighten a wire connection because it'll always be loose??:confused:
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Is the conductor actully loose? ... No. but I can tighten it more. (I am talking condutors say larger then 2/0.

Pretty much the case with AL particuly. But Brian mentioned that sometimes you can get 're-torque' values which I have never been provided with.
 
iwire said:
Is the conductor actully loose? ... No. but I can tighten it more. (I am talking condutors say larger then 2/0.

Pretty much the case with AL particuly. But Brian mentioned that sometimes you can get 're-torque' values which I have never been provided with.
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I can see that happening with stranded Cu but not solid.
 
ultramegabob said:
strong arm torque specs are "tighten er down til ya hear it pop, then back er off a quarter turn"
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In the navy we had 2 values.

1. Star torque - Torque it until you see stars
2. WKBEM - White Knuckled Bug Eyed Monkey Torque.
 
I am shocked at the apparant lack of electricians that torque thier connections, again, another reason for 3rd party acceptance testing, we are required to check all connections for proper torque, and have calibrated wrenches.

We even have to know these specs for our certification exams, see attached table 100.12 from NETA ATS
 
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