The hierarchy of control is a systematic approach to risk management, ranked from the most effective measure to the least effective. For overhead power line safety, this includes:

1. Elimination: The most effective method is to eliminate the hazard completely. This can involve de-energizing the power line, relocating it underground, or rerouting the work to an area without overhead lines.

2. Substitution: Substitute a less hazardous practice, for example, using non-conductive tools or different equipment that cannot reach the exclusion zone.

3. Engineering Controls: These are physical changes to the workplace to isolate people from the hazard. This includes using insulated barriers, "tiger tails" on low-voltage lines, or setting up physical exclusion zones with goalposts and flags.

4. Administrative Controls: These are changes to work procedures, such as providing training, implementing strict safety protocols, and appointing a dedicated spotter to monitor clearance distances.

5. Personal Protective Equipment (PPE): This is the least effective control measure on its own and should be used in conjunction with other methods. Appropriate PPE includes hard hats, insulated gloves with leather protectors, and flame-resistant clothing.

At Ningbo Changshi, we provide a full range of high-quality equipment and tools to support these control measures and ensure the safest possible working conditions for power line projects.