John,
You raise an interesting thing......
Torquing screws.
I usually use Wiha screwdrivers (and this is in no way an endorsement), I note however that they have bought out a line of Insulated screwdrivers that have an in-built torque function.
However, I'm not sure about the US, but I would struggle to find any torque stipulations for common connectors.
Some equipment like controllers, state this in the manual, but if you get stuff off the shelf that is reasonably common
with no paperwork at all, how tight are you meant to tighten the screws up?
Obviously you tighten them enough, before they strip or shear off.
If that connector (or such) then fails because you have over-stressed the screw or the other part of the connection and causes a fire or loss of power to a building, I'm picking that you don't really have a leg to stand on, insurance liability-wise?
