12
1ZSE 5492-129 en, Rev. 6
1.5 Maintenance guide
Inspection and overhaul of the UC range of on-load tap-changers are carried out accord-
ing to the instructions in the appropriate Maintenance guide. You will need the Maintenance
guide since references are made to it.
1.6 Tightening torque
The following tightening torques are recommended
for metallic screw joints:
M6, 10 Nm ±10 %
M8, 24.5 Nm ±10 %
M10, 49 Nm ±10 %
M12, 84 Nm ±10 %
for non-metallic screw joints:
M10, 9 Nm
±10 %
M12, 13 Nm ±10 %
M16, 22 Nm ±10 %
if not otherwise is stated in this guide.
1. Introduction
