Siemens NXAIR Operating Instructions Manual page 340

Accessing the connection compartment through the front
Preconditions
•
Feeder earthing switch in CLOSED position
•
High-voltage door open
•
Door to voltage transformer compartment open
•
In the switching-device compartment and in the voltage transformer compartment:
•
Low-voltage connectors stowed away
•
Bushing plate and associated connecting elements available:
•
8 bolts M8x20 with contact washers and plain washers size 8 acc. to ISO 7093
•
3 bolts M8x20 with contact washers
•
Connection leads and associated connecting elements available:
•
3 nuts M8 with contact washers and plain washers
•
Vertical partition and associated connecting elements available:
•
8 bolts M8x20 with contact washers and plain washers size 8 acc. to ISO 7093
•
Protection plate and associated connecting elements available:
•
4 nuts M8 with contact washers
•
Voltage transformer compartment and associated connecting elements available:
•
14 bolts M8x20 with contact washers
•
Lid of metal cover and associated connecting elements available:
•
2 bolts M8x20 with contact washers
•
Wiring duct cover and associated connecting elements available:
•
3 bolts M8x20 with contact washers
•
Labyrinth and associated connecting elements available:
•
4 bolts M8x16 with contact washers
•
2 nuts M8 with contact washers
Procedure
Install the bushing plate with bushings.
Fix the bushing plate by screwing the bolts hand-tight:
•
8 bolts
acc. to ISO 7093 (1)
•
3 bolts M8x20 with contact washers (2)
Tighten the bolts with a tightening torque of 25 Nm.
340
NOTICE
Damages inside the switching-device compartment
Damages inside the
compartment due to incorrect or incomplete installation of the partition / bushing
plate.
To fasten the partition / bushing plate, always assemble all bolted joints all
around, and screw them in up to the end of the thread.
M8x20 with
NXAIR / ≤ 40 kA
switching-device compartment / voltage
contact washers and
transformer
plain washers size 8
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