71
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6. Assembly of the switchgear at site
Busbars installation
• Install the busbars panel by panel according
to the rating of the switchgear. Screw on the
individual busbar elements one above the
other (depending on the system layout) and
in line with the flat branch conductor. For the
tightening torque please refer to the "6.3
Assembly of the switchgear panels". Use
tightening material supplied by ABB.
• Bolt one holder to each end of the busbars to
support insulating cover. The screws for
holder must be tightened with a lower torque
(for insulated busbars only).
• Position insulating covers and lids over the
relevant bolted joint, and slide the lid onto
the cover until it clicks into place (for
insulated busbars only).
Note:
Busbar connection is carried out with “stabilized
connections”. This means that the quality of the
copper busbar connections does not deteriorate
according to the operating time and therefore it
is not necessary to inspect tightness of busbar
connections regularly. But this is on condition
that correct assembly is carried out as described
above and especially that all connections are
tightened with the prescribed torque according
to the table.
We recommend only checking tightness of busbar
connections during inspections.
Note:
In case that busbars insertion seems to be
difficult then can be exceptionally used
appropriate amount of the DOW CORNING TORAY
DC4 silicone grease compound applied on the
busbar insulation. After insertion busbars the
rest of DC4 silicone grease compound on the
insulation surface has to be properly cleaned up
by soft dry cloth.
The usage of any other types of grease for
insertion of busbars through the busbar
partitioning bushing & rubber partition is strictly
forbidden!
Figure 107: Washer before tightening Figure 108: Washer after tightening
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