Earthing and de-earthing the busbar system
134 NXAIR M 139-2021.9 / 07
Maloperation
If the operating lever is not inserted correctly, the busbar earthing switch may be
damaged.
Insert the operating lever in the actuating opening as far as it will go.
Instruction label on door to low-voltage compartment:
In addition to these instructions, an instruction label on the door to the low-voltage compartment informs
about proper handling of the operating lever for the busbar earthing switch.
Fig. 223: Instruction label on door to low-voltage compartment
Preconditions
Busbar earthing switch in OPEN position
Intended opening of the padlock released externally
Operating lever available
Electrician's ladder available as double-step ladder
Electromagnetic interlock (optional) deactivated
If a withdrawable part is inserted in the panel:
Withdrawable part in test position
Low-voltage connector plugged on
Fig. 224: Operating lever for operating
the busbar earthing switch
Procedure
Ensure that the intended manual switching operation has been released externally.
Make sure according to the panel number at the panel that the release for manual earthing
of exactly this panel is available.
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