Siemens NXAIR Operating Instructions Manual page 281

Earthing and de-earthing the busbar system
Insert the operating lever in the actuating opening for the busbar earthing switch in such a
way that the pins of the operating lever coincide with the actuating opening in vertical
position.
Fig. 517: Inserting the operating lever for opening
Insert the operating lever in the actuating opening as far as it will go.
Hold the operating lever with one hand straight in the actuating opening and turn the
operating lever with the other hand counter-clockwise as far as it will go (that is
approx. 115°) until the busbar earthing switch changes to OPEN position.
Fig. 518: Opening the Fig. 519: Opening the busbar earthing switch
busbar earthing switch using an electrician's ladder
While turning the operating lever, the position indicator of the busbar earthing switch
changes from the CLOSED position to the intermediate position.
Fig. 520: Position indicator in intermediate position
NXAIR / ≤ 40 kA
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