If the height is less than 2m, it is not necessary to climb or use special equipment such as hanging baskets, and it is not necessary to hold the aerial work permit. If the height exceeds 2m, it is necessary to use equipment such as aerial work platform, shelf or hanging basket, then it must be operated by certified personnel, and the corresponding aerial work certificate is required.

The aerial work permit is a qualification certificate to prove that the operator has aerial work skills and experience.