Metal guards on stud for wiring

[Norcal]

Found this on the Schneider (Square D) page:

https://www.se.com/us/en/faqs/FA128927/

Gotta get out my inch-pound torque wrench and confirm the lug values.

My take is its more intended to insure people tighten them enough, and not assume that just snug is good. In Wisconsin we have no tremors or earthquakes. But in other locales enough shaking could occur to cause a connection to fail and arc if the lug wasn't tight enough to begin with. Do the lug screws loosen over time due to wire strand settling?

If you torque the terminals to the required value there is no need to retorque them, has nothing to do with earthquakes, Remember excessive torque is as bad as not enough.

 

[andyvh1959]

Yup, I know well that over-torque can fail a hydraulic hose connection, can fail a bolt you thought was tight (over-stretched), and cause a wire connection fail.

 

[Pingel85]

I think you’ll be surprised. Torque values on lugs are probably less than what you would think. If you tightened them down hard as you can go, you’re probably past the required torque value. I wouldn’t lose any sleep over that, lots of panels get installed a year with a “tight is tight” torque spec.