What is the minimum number of positions that must be on all load charts for boom cranes?

The minimum number of positions that must be on all load charts for boom cranes is four. This requirement is in place to ensure that operators have sufficient information to safely and effectively understand the limits of the crane's lifting capabilities under various conditions. These positions typically represent different boom angles and extensions, allowing for a comprehensive evaluation of the crane's load capacity at various configurations.

Having at least four positions on the load chart provides operators with essential data to make informed decisions regarding safe lifting practices. It helps to prevent overloading, which can lead to equipment failure or accidents. This standard is crucial for maintaining safety and compliance within the industry, ensuring that all operators are given the necessary guidance for proper crane operation.

Fewer than four positions would not adequately represent the crane's capabilities across a range of scenarios and could lead to unsafe practices if operators were to attempt lifts without understanding the full load capacity for their specific configuration.