ABB UniGear 500R - Assembly of the Switchgear Panels

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6.3 Assembly of the switchgear panels
WARNING
Installation must be carried ABB either by our
personnel or by suitably qualified skilled customer
personnel with in-depth knowledge of the
switchgear instalation.
6.3.1. Checking connections and contact surfaces
The switchgear room must be clean, dry and complete
with all the necessary fixtures and fittings (cable duct,
gas outlets etc.). Moreover:
 make sure that the switchgears are clean and not
damaged or deformed by any possible impact
during shipping or storage.
 make sure that the connection connectors are
clean and not deformed;
 make sure that the circuit-breaker auxiliary
contacts and the three-position disconnector
monoblocks are clean and not deformed by any
possible impact during shipping or storage;
 make sure that the contact surfaces of the earthing
busbar connections are perfectly flat, without any
burrs, oxidation traces or deformations caused by
possible blows;
 choose the conductor section according to the
rated normal current and to the short-circuit
current of the apparatus.
a) Connection surface treatment
The connections are made either of bare copper or of
silverplate copper. The surface treatment must have a
constant, uniform thickness.
b) Mounting procedures
Carry out the following operations:
 make sure that the connection contact surfaces
are perfectly flat, without any burrs, oxidation
traces or deformations caused by possible drilling
or blows;
 perform the operations shown in the table below
on the conductor contact surface.
Silver-plated copper conductor
 Clean by means of a fine file or emery cloth
 Fully tighten.
Copper conductor
 Clean by means of a rough, dry cloth
 Only in the case of tough oxidation traces, clean
with a very fine emery cloth, taking care not to
remove the surface layer
 Should it be necessary to carry out another
surface treatment, please contact ABB.
6.3.2. Coupling cubicles
Use screws of tensile class 8.8. The tightening
torques for the busbar screw connections with dished
washer are as follows:
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)
M5
(3)
2.5
-
M6
(3)
10
8
M8
25
20
M10
50
40
M12
85
69
M16
200
170
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)
M8
15
12
M10
32
26
M12
45
36
M16
70 -
M20
70 -
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)
M12
70
57
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
20
16
Tightening torques for copper contact pins inside epoxy
spout
Thread
(2)
Max. recommended tightening torque Nm
(1)
Without (ƞ=0.14)
Oil of grease (ƞ= 0.10)
M10
46
37
M20
250
200
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.