hi nice forum you got here. Just wondering how many here use a torque wrench on lugs? the reason i ask is because i started a new job and i was cutting in the main switchgear and the foreman of this job asked why i use a torque wrench for.I replied don't you? He said no. I was also asked why i use antishorts and twisted my wires. go figure
Gidday there guys, Welcome to the Board!. I've always used a Torque Wrench, and especially where the manufacturer states that one should be used. Not doing so can do nasty things, like void the warranty on the equipment!.
Let's face it, these days if you're not young, you're old - Red Green
I have 3 different torque wrenches, and use all of them, afterwards making a slash mark with a sharpy (felt pen) so I make sure not to miss any. You'll find torque specs on nearly all terminations, from big switchgear down to the little branch breakers. To not torque these termination is, I believe, a violation of NEC 110.3(B) "Installation and Use Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling" Torque specs are also available from the manufacturers of mechanical lugs (Ilsco, Burndy, etc)...S
When torqing down on a lug. (whether a disco lug, ground lug or any old lug). I've seen charts which show torque setting based on the size allen and other charts based on the wire size terminating to the lug. Which do you use?
For example 3/8 allen = 32 ft lbs or 500kcmil = 24 ft lbs