Earthing / De-Earthing The Busbar System Manually; Earthing / De- The Busbar System Electrically - Siemens NXAIR Operating Instructions Manual

Panels with motor operating mechanism control

27.16 Earthing / de-earthing the busbar system manually

Earthing / de-earthing the busbar system manually is carried out by inserting a lever through an actuating
opening in the door to the low-voltage compartment, and turning it subsequently. Depending on the turning
direction, the busbar earthing switch in the busbar compartment is set to either CLOSED (= earthed) position
or OPEN (= de-earthed) position.
The procedures for earthing / de-earthing the busbar system manually in panels with motor operating
mechanism control are identical with the procedures in panels without motor operating mechanism control.
For earthing / de-earthing the busbar system manually, see chapter 21.

27.17 Earthing / de- the busbar system electrically

Preconditions
•
Remote or local control
•
If a withdrawable part / switching-device truck is inserted in the panel:
•
Withdrawable circuit-breaker / circuit-breaker truck in test position
•
Low-voltage connector plugged on
Procedure
Set the busbar earthing switch to OPEN or CLOSED either locally or from the central control.
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NOTICE
Conflicting operation
The requirement of setting the panel to either local or remote control prevents
operating the panel locally and centrally at the same time.
For any local operations ─ manual or electrical ─ set the panel to local
control, for example by switching the local-remote switch to LOCAL
position.
NOTICE
Conflicting operation
Earthing / de-earthing the busbar system electrically is possible locally or from a
central control. The requirement of setting the panel to either local or remote
control prevents operating the panel locally and centrally at the same time.
Depending on the intended operating mode, set the panel to either local or
remote control (for example by switching the local-remote switch).
NXAIR / ≤ 40 kA
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