Master the essential skill of interpreting crane load charts safely and accurately. Required knowledge for all certified operators.
A load chart is a manufacturer's specification that shows the safe working load (SWL) capacity of a crane at different boom lengths and angles. Every crane operator must understand how to read their specific crane's load chart.
Measure or confirm the boom length from the manufacturer's specifications. Standard lengths typically range from 40 to 200+ feet depending on crane type.
Identify the angle at which the boom will be positioned for your lift. Angles typically range from 0° (horizontal) to 90° (vertical). Most charts show angles in 5° or 10° increments.
Locate the row for your boom length and follow across to the column for your boom angle. The number at that intersection is your safe working load.
Weigh your load and any rigging equipment. The total weight must not exceed the SWL shown in the chart.
❌ Reading wrong chart: Always use the correct chart for your crane model, boom length, and configuration.
❌ Forgetting rigging weight: Hooks, slings, and spreader bars add to the total load.
❌ Ignoring boom angle: Capacity changes significantly with angle changes.
❌ Exceeding wind limits: Load capacity decreases in high wind conditions.
Load chart interpretation is a critical component of NCCCO certification exams. Operators must demonstrate proficiency in quickly and accurately reading load charts under test conditions.
Our load chart practice exams provide realistic scenarios and immediate feedback to help you master this essential skill.
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