Why Should A "do Not Close" Warning Sign Be Hung On The Pole Where The Low-voltage Circuit Breaker Is Located After The Operation Is Completed?

At power operation sites, the status of Lv Pole Mounted Circuit Breakers is directly related to the safety of the working environment for on-site personnel. After completing maintenance, grounding, or equipment commissioning work, the work team will hang a clearly visible sign stating "Do Not Close, People Working" on the circuit breaker handle or pole.

This practice stems from safety management requirements: when personnel are on the line, a "Do Not Close" sign must be placed on the circuit breaker or disconnector handle to remind all personnel handling the equipment that they are in a specific working state, and no operator may close the circuit breaker before the sign is removed.