1. Personnel engaged in signal command must have a strong sense of responsibility, be able to adapt to aerial work, pass professional safety technical training and examination, and obtain a special operation certificate before taking up their posts with certificates;

2. Signatories should be able to master and be familiar with four command methods: semaphore, whistle, gesture and walkie-talkie;

3. The bell man should check the slings before going to work every day to ensure the safety and effectiveness of the slings and be responsible for their safety and technical conditions;

4. Boan. Com/Tips: We must concentrate on signal command to ensure the operation safety of hook personnel, personnel under hoisted objects and lifting equipment, and ensure that hoisted objects and materials are stacked neatly and safely, so as to ensure the safety of the whole lifting process;

5. The bell man must dress neatly and wear safety helmet correctly when he is on duty. When standing in a dangerous position (limbs, suspension, etc.). He must fasten his seat belt correctly. Prohibition of drinking and working;