What must be stamped on rating plates?

The correct answer focuses on the essential safety and operational information necessary for the safe use of a hoisting machine. The rating plate must indicate the maximum and minimum loads that the equipment can safely lift, along with two intermediate ratings. This information is crucial for operators to understand the lifting capacity of the equipment and ensure they do not exceed the specified limits, which is vital for safety and to prevent equipment failure or accidents.

Having these load ratings clearly shown on the rating plate helps operators make informed decisions when loading the machine. It also serves as a quick reference to ensure compliance with safety regulations and industry standards. This information helps maintain safe working conditions for operators and all personnel in the vicinity of the equipment.

In contrast, while elements such as engine horsepower, torque ratings, the make and model of the machine, and maintenance schedules are important for understanding the machine’s overall functionality and upkeep, they do not pertain directly to the operational limits that must be adhered to during lifting activities. Therefore, these elements can provide valuable context but are not the critical regulatory information required on the rating plate.