A crane is being used to lift precast concrete panels weighing 8,500 pounds each. The crane's load chart shows a capacity of 10,000 pounds at the required radius. What is the maximum safe working load for this lift?
Correct Answer
D) 8,000 pounds
OSHA requires crane operations to include appropriate safety factors. The working load should not exceed 80% of the crane's rated capacity at the specified radius, which would be 8,000 pounds (10,000 × 0.8), making the 8,500-pound panels unsafe for this configuration.
Why This Is the Correct Answer
OSHA crane safety regulations require that the working load not exceed 80% of the crane's rated capacity to provide an adequate safety margin. With a rated capacity of 10,000 pounds at the required radius, the maximum safe working load is 10,000 × 0.8 = 8,000 pounds. Since the precast panels weigh 8,500 pounds each, they exceed this safe working limit and would require a crane with higher capacity or repositioning to reduce the radius.
Why the Other Options Are Wrong
Option B: 10,000 pounds
This is the actual weight of the panels, but the question asks for the maximum safe working load of the crane, not the panel weight.
Option C: 8,500 pounds
This represents 90% of capacity, which exceeds the required 80% safety factor mandated by OSHA regulations.
Memory Technique
Remember 'Eight-Zero Rule' - crane operations should never exceed 80% of rated capacity for safety
Reference Hint
OSHA 29 CFR 1926 Subpart CC - Cranes and Derricks in Construction, or Florida Building Code Chapter 33 - Excavation and Grading
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