Assembly Of The Switchgear Panels - ABB UniGear ZS1 Instruction Manual

Æ 16
Figure 55: Anchoring bolts on concrete floor
M 12
Figure 57: Through hole on metal structure

5.3 Assembly of the switchgear panels

36
Use screws of tensile class 8.8. The tightening torques for the busbar screw connections with dished
washer are as follows:
Thread
M6
M8
M10
M12
M16
1) The rated tightening torques for fasteners without lubrication are based on a coefficient of friction for the thread of 0.14 (the actual
values are subject to an unavoidable range, in part not inconsiderable).
2) Rated tightening torques for fasteners with lubrication in accordance with DIN 43 673 Standard .
3)
Thread and head contact surface lubricated.
Any tightening torques which deviate from those in the general table (e.g. for contact systems or device
terminals) must be taken into account as stated in the detailed technical documentation.
It is recommended that the threads and head contact surfaces of bolts should be lightly oiled or
greased, so as to achieve a precise rated tightening torque.
Æ 16
Figure 56: Base irons on concrete floor
M 12
Figure 58: Threaded hole on metal structure
Recommended tightening torque
Lubricant
Without
10.5
26
44.1
74.6
165
1) 2) Nm
3)
Oil or grease
4.5
10
20
40
80