U N I S EC
I N S TA L L AT I O N M A N UA L
46
NOTE
Tightening must be carried out with the correct
torque
4.3.2 Main earthing circuit connections between
the panels of the SBR functional unit
a) Install the protection busbar conductor between
panels of the SBR functional unit.
b) Connect the L-shaped protection conductor
between the SBR unit and other panels.
4.3.3 Connection of the main earthing circuit for
WBC – WBS units
a) Install the earthing busbar between the units and
connect it to the main earthing circuit.
4.4 Final installation work
Checkpoints
• Check the painted parts of the switchgear for any
damage, touching up where required.
• Check the bolt connections and tighten where
required (especially those made during on-site
installation of the busbars and earthing system.
• Clean the switchgear thoroughly.
• Remove all foreign objects from the units.
• Correctly replace all coverings, etc. removed
during the installation and connection
operations.
• Any remaining openings in the switchgear
housing must be closed if they are no longer
needed.
• Check that the isolating contacts and
interlocking mechanisms operate correctly and, if
necessary, grease them again with Isoflex Topas
NCA 52.
• Insert any withdrawable circuit-breaker parts and
connect them to the control cabling.
• Close the unit doors properly.
c) Earthing busbar installed.
d) The earthing cables can be mounted with bolts,
as shown in Figure 118. The M12 bolt, marked with
the earthing symbol, is reserved for the external
station earthing system, the other M10 bolts (3
pieces) for the cable sheaths or other earthing
systems.
e) Connect the earthing cables to the main earthing
busbar of the SBR functional unit.
Figure 117. Earthing busbar installed
Figure 120. SBR unit protection busbar conductor
Figure 118. Positions of the earthing cables
Figure 119. Main protection earthing busbar of the SBR unit
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4. Cable connections