An operator must lift a 12,500 kg load. The load chart for the selected boom length and radius shows a gross capacity of 14,000 kg. The rigging plan accounts for a 500 kg hook block and a 150 kg headache ball. There are also specialized spreader bars and slings weighing a total of 700 kg. What is the net lifting capacity available for the load?

Question: An operator must lift a 12,500 kg load. The load chart for the selected boom length and radius shows a gross capacity of 14,000 kg. The rigging plan accounts for a 500 kg hook block and a 150 kg headache ball. There are also specialized spreader bars and slings weighing a total of 700 kg. What is the net lifting capacity available for the load?

Answer options: ✅ 12,650 kg

• 12,000 kg
• 14,000 kg
• 13,300 kg

Correct answer: 12,650 kg

Explanation: All items hanging below the boom point (hook block, headache ball, spreader bars, slings) are deductions that must be subtracted from the gross capacity to determine the net capacity available for the load. Total deductions = 500 kg + 150 kg + 700 kg = 1,350 kg. Net capacity = Gross Capacity - Total Deductions = 14,000 kg - 1,350 kg = 12,650 kg. The load of 12,500 kg is within this net capacity. This is a common and important calculation required by CSA Z150.