convertions

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ozzie36

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Im landing 350,400,500 mcm aluminun wire on to some breakers.My question is I have to tork all the wires to a certin pound per foot pressure.I have the ratchet that torks pound per foot.But on door of the gear,there is a chart that reads pound per inch??? How can you convert pound per foot to pound per inch? Is there a formula,or am I looking at the wrong place.
 
You can convert inch pounds to foot pound by simply dividing by 12.

50 inch pounds = 4.166 foot pounds.

The problem is that a torque wrench designed for foot pounds will not be sensitive enough for the low value of inch pounds.

I have never seen a foot pound torque wrench with settings less then 10 foot pounds which is 120 inch pounds.

You should probably get a inch pound torque wrench.
 
I too question how one would "damage the gear" with the wrong torque wrench, but you probhably won't get the right torque - the lowest setting might be too much.
 
And I have always lubricated the threads and doped the termination using NoALox or similar prior to torquing. Never did know if this was proper procedure or not. Made me feel better.

Anybody?
 
I don't know about the lub..but the torque wrench damaging equipment issue has kind of annoyed me so I shall expound on this issue..I feel when we all have done this for some time the damage incurred with a torque wrench is only to the item being torqued..why do I have to be so specific? Now I have done a little research and ask some of my friends since the last time we were on the torque wrench issue, like calibrating the torque wrench. I ask electricians, industrial mechanics, and some auto mechanics. The mechanics use torque wrench's why more frequently than we do..out of all the people I ask around 20 not one of them have had their torque wrench calibrated in the last year some of them even said they have never had them calibrated. the majority of them did say they turn them to lowest setting and keep them in the cases..so now some of the most common wrench sizes are 1/4" drive is 20 to 200 inch lbs, in 1lb increments. 3/8" drive are 40-200 inch lbs, in 1 lb increments, 3/8 inch drive 10-150ft lbs, in 5 lb increments, 1/2" drive 25-250ft lbs in 1lb increment..now you can get specialty wrench's and the increment ranges run from .2lbs to 5lbs and even in 3/4" and 1" drives..the accuracy rate of torque wrench's ranges from 3% to 6%..so 200 inch lbs of torque is only 16.6 ft lbs and that is on low side so to use a ft lbs torque wrench on an inch lb torque item could cause damage to the item being torqued. the information on torque wrench came from researching various wrench on the Internet and reading their specifications..
 
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