1. The top of the ladder should have safety hooks, and the foot of the ladder should have anti-skid devices.
2, the Angle of the ladder should be 60° appropriate, when people climb the ladder, there must be someone below the ladder prohibit two people with the same ladder. Don't work at the top of the ladder.
3. When the ladder pole is broken or welded, it shall be repaired in time; otherwise, it is prohibited to use.
4. The height of the herringbone ladder shall not exceed 2.5 meters, and it must be held in the middle with reliable pulling rope.