Siemens NXAIR - Tightening Torques and Control Tightening Torques for Bolted Joints

Final assembly work
200 NXAIR / ≤ 40 kA 110-0084.9 / 15
Procedure
Remove foreign objects, for example:
• Tools
• Unused installation material and cable sections
• Cleaning material
Remove loose installation residues and dust with the vacuum cleaner.
Clean surfaces with a soft, dry and lint-free cloth.
If required, clean with a humid cloth and soft household cleaner; then dry well.
12.2 Tightening torques and control tightening torques for bolted joints
Tightening torques
Bolted joint
Tightening torque
M8
30 Nm
M12
70 Nm
M16
110 Nm
Control tightening torques
Bolted joint
Tightening torque
M8
25 Nm
M12
60 Nm
M16
90 Nm
Tightening torques for other than the mentioned bolted joints are stated separately in the respective
assembly operation.
INFORMATION
Check the control tightening torques of those bolted joints at random, which
are located at the freely accessible points of the switchgear. They also
include those inside non-bolted compartments:
• Switching-device compartment
• Low-voltage compartment
If it cannot be determined without any doubt that the not freely accessible
bolted joints are properly mounted, make them accessible and check as
well:
• At covered points of the external enclosure
• In the busbar compartment
• In the pressure relief duct
• In the connection compartment
The check of the bolted joints comprises:
Check of the tightening torque with a torque wrench.
If required, correction of the tightening torque according to the above
specifications.