It is all dependent on the size and what it is made of (steel, zinc, etc). I found a chart years back that had standard tightening torques, per types and sizes, you might find something like that. Of course, manufacturers recommendations are always best.
#63351 - 03/14/0609:48 AMRe: how tight do i tighten the lugs?
Everyone left out the most important torque range called "erks." This is the sound the fastener makes just before breaking or stripping out. :-)
Most meter sockets have a label that states the torque value. Sometimes for the breaker it is marked on a label in very small type or is embossed into the body of the breaker, both of which are hard for us older guys to read.
Few things are harder to put up with than the annoyance of a good example.
#63353 - 03/14/0612:43 PMRe: how tight do i tighten the lugs?
The "erk" brings up an interesting point. Generally torque specs are based on a lightly oiled fastener. The "erk" is actually the galling of a dry fastener in the threads. Is there a listed lubricant for these fittings? Friction in the threads could wildly alter the actual clamping force at any given torque, particularly in a termination that has been oxidizing for a while. (In use or on the shelf)
#63354 - 03/14/0601:00 PMRe: how tight do i tighten the lugs?