Powermaster Tube Expansion System

This is never the case. Practically, the supply voltages vary as much as 20% to 25%. This directly affects the expansion results as the drive trips at a set current. That means for a 20% higher supply voltage, the tubes will be effectively expanded by 20% more torque than the required one using the electric tube expansion systems. Hence tubes will be over-expanded. For supply voltages less than normal, tubes will be under expanded proportionately