I hope someone can help. I am an Production Engineer. We have a situation where we have to torque a 16mm copper cable in a box terminal by 4Nm. The cable will be used to carry a high electrical current. We find that after torqueing (About 5 hours or so) the terminal can be re-tightened back to 4Nm. I am told this is to do with Youngs Modulus and the characteristics of copper. I have taken a look at Youngs Modulus but it all seems centred around the stretching of copper and not the compression / "squashing" of copper. Would anyone know how to work out: 1. What interval we should wait before re-torque, 2. How many times you would need to re-torque, 3. Is re-torque the best option or is there an alternative. 4. Am I even on the right track with regards to Youngs Modulus or are there any other suggestions? Any assitance would be greatly appreciated.