59
—
6. Assembly of the switchgear at site
6.3 Assembly of the switchgear
panels
Use screws of tensile class 8.8. The maximum
recommended tightening torques based on each
type of connection are given in the following
tables:
Thread
(2)
Max. recommended tightening torque
[Nm]
(1)
Without (ƞ=0.14)
Oil of grease
(ƞ=0.10)
M5
(3)
2.5 -
M6
(3)
10 8
M8 25 20
M10 50 40
M12 85 69
M16 200 170
Tightening torques for copper bars or combined busbar
connections
Thread
(2)
Max. recommended tightening torque
[Nm]
(1)
Without (ƞ=0.14)
Oil of grease
(ƞ=0.10)
M8
15 12
M10 32 26
M12 45 36
M16 70 -
M20 70 -
Tight. torques for copper bar connections combined
with epoxy insulators
Thread
(2)
Max. recommended tightening torque
[Nm]
(1)
Without (ƞ=0.14)
Oil of grease
(ƞ=0.10)
M12
70 57
Tight. torques for copper bar connections combined
with ABB CTs
Thread
(2)
Max. recommended tightening torque
[Nm]
(1)
Without (ƞ=0.14)
Oil of grease
(ƞ=0.10)
M10
20 16
Tight. torques for copper bar or cable connections combined
with ABB VTs
Thread
(2)
Max. recommended tightening torque
[Nm]
(1)
Without (ƞ=0.14)
Oil of grease
(ƞ=0.10)
M10
46 37
M20 250 200
Tightening torques for copper contact pins inside
epoxy spout
Note: Thread and head contact surface lubricated.
(1) The recommended maximum tightening torques
are based on a coefficient of friction for the thread of
0.14 (without lubrication) or 0.10 (with lubrication).
(2) The tightening torques are recommended for screws ISO
4014-4018 and ISO 4762 (tensile class 8.8). If using other
types of screws please contact ABB for clarification.
(3) Applicable only for fixing of subsidiary
covers or terminal connections.
To Next Page
Loading...
