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A S S E M B L Y O F T H E S W I T C H G E A R O N S I T E
5.3 Assembly of the switchgear panels
Use screws of tensile class 8.8. The maximum
recommended tightening torques based on type
of connection are given in the following tables.
The tightening torques for copper bars or
busbars connections together.
Maximum recommended tightening torque
Lubricant
Without (η=0,14)
Thread
3)
-
M5
4)
-
M6
4)
-
M8
-
M10
-
M12
-
M16
The tightening torques for copper bar
connections combined with epoxy insulators.
Maximum recommended tightening torque
Lubricant
Without (η=0,14)
Thread
3)
15
M8
32
M10
45
M12
110
M16
M20
220
The tightening torques for copper bar
connections combined with ABB CTs.
Maximum recommended tightening torque
Lubricant
Without (η=0,14)
Thread
3)
70
M12
The tightening torques for copper bar or cable
connections combined with ABB VTs.
Maximum recommended tightening torque
Lubricant
Without (η=0,14)
Thread
3)
20
M10
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) Thread and head contact surface lubricated.
3) The tightening torques are recommended for screws ISO 4014-4018
and ISO 4762 (tensile class 8.8). In case of usage of other types of
screws contact please ABB for clarification.
4) Applicable only for fixing of subsidiary covers or terminal connections.
Any tightening torques that deviate from those
in the general tables (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 the precise rated
Nm
1)
tightening torque.
2)
Oil or grease (η=0,10)
The individual installation stages are as follows:
-
•
8
20
40
•
69
•
170
•
Nm
1)
•
2)
Oil or grease (η=0,10)
-
•
-
•
-
-
-
Fit and screw down the lids.
•
1)
Nm
2)
Oil or grease (η=0,10)
-
•
Nm
1)
2)
Oil or grease (η=0,10)
-
Remove the withdrawable parts from the
switchgear panels and store them with suitable
protection
Dismantle the lifting eyebolts
Transport the switchgear panels to the prepared
installation point, following the sequence shown
on the switchgear plan
Remove the vertical partitions in front of the
busbar compartments by releasing the fixing
screws
Release the fixing screws and draw out the
horizontal partition below the withdrawable
part travel rails
Release and remove the floor cover
Remove the covers from the vertical control
wiring ducts, positioned on the right- hand
left-hand sides of the panel front
Correctly position and vertically align the
switchgear panels along the floor frame - the
panel edges must not deviate by more than 2
mm from the vertical, especially at the front -
and bolt the panels together. It is advisable to
start from the centre when assembling
switchgears with more than ten panels
When the switchgear has been properly
assembled, fix the panels to the concrete floor
using plugs, or weld or adequately bolt them
to the foundation frame
27
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