During a multi-crane lift to install a 50-metre (164 ft) steel truss, two cranes are required to collaboratively hoist the load. According to CSA Z150-16, what is the primary consideration when determining the load distribution between the two cranes?

Question: During a multi-crane lift to install a 50-metre (164 ft) steel truss, two cranes are required to collaboratively hoist the load. According to CSA Z150-16, what is the primary consideration when determining the load distribution between the two cranes?

Answer options:

• Ensuring the largest crane carries at least 75% of the total load. ✅ Each crane's share of the load must not exceed 80% of its rated capacity for the specific configuration.
• Distributing the load equally between the two cranes regardless of their individual capacities.
• The total weight of the truss must be less than the sum of the cranes' minimum hook heights.

Correct answer: Each crane's share of the load must not exceed 80% of its rated capacity for the specific configuration.

Explanation: When two or more cranes are used to lift a load, the portion of the load to be handled by any one crane shall not exceed 80% of the rated capacity of that crane for the radius and configuration being used. This safety margin (80% rule) is a critical requirement in multi-crane operations to account for dynamic loading and minor imbalances, as per CSA Z150-16 Section 5.1.7.3.