Siemens NXAIR M Operating Instructions Manual page 112

Operating the removable voltage transformers
Remove the racking tool.
Fig. 181: Removing the racking tool
To close the actuating opening, push the operating slide down as far as it will go.
Fit a padlock to the operating slide and close it.
Fig. 182: Fitting a padlock
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The removable voltage transformers are in test position.
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