It is not allowed to carry out maintenance on live equipment.
The main and auxiliary power supply of the related circuit must be disconnected.
Draw-out components/components must be placed in a "break" position
Verification of no electricity by electroscope
Short Connection and Grounding Protection Measures
Do not leave the inventory tool in the equipment
Removal of relevant protective measures
Insulation test and record
Put the extractor in the working position
Restore power supply