How is the crane's safe working load determined for a given lift?

• A. Increase the load until the crane tip warns
• B. Estimate based on experience only
• C. Use the crane’s load rating chart for the configured boom length, radius, and load height to find the Rated Capacity; ensure the actual load weight does not exceed that rating and adjust configuration or crane as needed.
• D. Choose the heaviest possible load to test

Answer: (C)

Safe working load is determined by the Rated Capacity shown on the crane’s load rating chart for the exact configuration you’re using. That chart links boom length, outreach (radius), and load height to a maximum allowable load, reflecting stability limits and structural strength for that setup. Before lifting, you look up the Rated Capacity for the current configuration and ensure the actual load weight does not exceed that value. If the load would exceed the rating, you adjust the setup or the crane—shorten the boom, reduce the radius, add counterweights, or switch to a crane with higher capacity—so the lift stays within the chart’s limits. Also confirm other factors are within safe operating conditions (level ground with outriggers, appropriate rigging, and acceptable wind). Relying on guessing or pushing the load until a warning occurs isn’t safe because it bypasses the official capacity guidance.