How is the level of high-altitude operation divided into high and low?

The level of high-altitude operations is divided according to the working height, usually divided into four levels, with the lowest level being the first level and the highest level being the special level. Specifically:

When the working height is between 2-5 meters, it is called first level high-altitude operation. There is a certain level of danger involved in high-altitude operations, and most of the falling accidents that occur at this level are minor and serious injuries; When the working height is between 5-15 meters, it is called second level high-altitude operation. Most of the falling accidents that occur during secondary high-altitude operations are serious injuries and fatalities; When the working height is between 15-30 meters, it is called level three high-altitude operation. The falling accidents that occur during Level 3 high-altitude operations are basically fatal accidents; When the working height is above 30 meters, it is called special grade high-altitude operation.