Copper cable lugs are stringently tested for both mechanical pull-out and short-circuit rating to provide safe and trouble-free operation in harsh electrical conditions. Mechanical Pull-Out Rating: Under IEC 61238-1 standards, the mechanical pull-out test is carried out to evaluate the amount of force needed to withdraw the cable from the crimped lug. For copper, the peak pull-out... https://www.pioneerpowers.com/copper-cable-lugs.php