ABB UNO-DM-TL-PLUS-US Product Manual page 39

All operations on the equipment must be performed with adequately
insulated clothing and instruments.
E.g.: insulating gloves, class 0, RC category
The maintenance technician must:
- ensure that the inveter is properly locked out/tagged out, so no one else
can switch on or operate the device during the maintenance operations
- report any anomaly or damage due to wear or aging so that the correct
safety conditions can be restored.
The installer or maintenance technician must always pay attention to the
work environment.
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