|
Precautions before starting maintenance:
Switch off incoming power supply before removing top plates and side covers. Lock out incoming power supply. For safe operations, rack out the incomer ACB to isolated position and lock it.
Measure voltage on busbars to ensure that busbars are de-energised.
Switch off the control supply.
Isolate remote control voltage souvrces.
Short all CT secondaries.
In case of shutdown on only one feeder, lock the upstream breaker in isolated position.
For safety of personnel, while working on busbars, provide temporary earthing using a metallic chain/strip near the work place. Remove this earthing only after the job is completed.
|
