Accessing The Connection Duct Through The Rear Side Of The Panel - Siemens NXAIR M Operating Instructions Manual

20.3 Accessing the connection duct through the rear side of the panel

139-2021.9 / 07
Accessing the connection compartment through the rear
HINT
Final procedure steps
Now the panel can be integrated into the course of operation again, for example:
De-earthing the feeder.
Racking the withdrawable part to service position.
DANGER
Electric shock
To perform any kind of activities inside or near the connection duct of a panel, you
must ensure that the connection duct is safely isolated from supply. Without
isolation from supply, the cables in the connection duct will be live at operational
high voltage.
Before removing a rear wall on the connection duct of a panel, isolate and
earth the cable connections in the connection duct.
Provide a warning on the high-voltage door to indicate activities in the
connection duct on the rear side of the panel.
Observe the Five Safety Rules.
Verify safe isolation from supply.
Do not operate the feeder earthing switch during any activities inside or
near the connection duct.
WARNING
Reduced safety
The closed connection duct is an important safety element of the switchgear. The
connection duct is exclusively opened for performing operational activities inside
the connection duct.
Close the connection duct with rear walls, ledges and tightened bolts:
If an activity inside the connection duct is interrupted.
Immediately after an activity inside the connection duct was completed.
CAUTION
Sharp edges
The metal parts of the rear walls may have sharp edges.
Put on personal protective equipment.
NXAIR M 183