The definition of working at height

Working at height,also known as high homework,according to the high job grading standards refers to the fall in height datum more than 2 meters (including 2 meters) is likely to fall the heights of the homework.Working at height in 2 meters to 5 meters,referred to as the working level 1 of higher;working at height above 5 meters to 15 meters,referred to as the working level 2 of higher;working at height in more than 15 meters to 30 meters,referred to as the working level 3 of higher;working at height above 30 meters,referred to as super high homework.