Drying Process & Tightening Recommendations
Proper drying of our devices is a crucial step to ensure their optimal performance.
We recommend the following drying conditions : maximum temperature of 110°C for 8 to 12 hours.
TAP CHANGERS: HM, HZ, FII, FII-HI, HI, and HT
Following the drying process, we recommend tightening the screws and nuts that are directly connected to insulating material components (such as paper and phenolic resin laminates) according to the specifications below:
• Metal screws and nuts:
• M5 → Tightening torque: 5 N.m
• M6 → Tightening torque: 9 N.m
• Glass-fiber reinforced epoxy screws and nuts (Permaglas):
• M8 → Tightening torque: 5 N.m
• M10 → Tightening torque: 7 N.m
• M12 → Tightening torque: 9 N.m
Note: Glass-fiber reinforced epoxy screws and nuts (Permaglas) are not glued in our workshops.