IBEW Apprenticeship 1st Year Practice Test 2025 – Full Exam Prep

Question: 1 / 440

To safely lift a 10,000 pound load with a hoist, what is the minimum required wire rope breaking strength?

30,000 lbs

40,000 lbs

50,000 lbs

When lifting heavy loads, safety is paramount, and understanding the appropriate wire rope breaking strength is crucial to ensure the operation's safety. The minimum required wire rope breaking strength is generally calculated by applying a safety factor to the load being lifted.

In most hoisting operations, a common safety factor is 5:1. This means that if you are lifting a load of 10,000 pounds, you would need a wire rope with a breaking strength of at least five times that load to account for dynamic loads, shock loads, and other potential stressors that could occur during the lift.

Calculating this:

10,000 pounds (load) x 5 (safety factor) = 50,000 pounds.

Thus, the minimum required wire rope breaking strength, adhering to the standard safety practices, is 50,000 pounds. This ensures that the wire rope can handle not only the weight of the load itself but also any additional stresses encountered during lifting, thereby maintaining safe working conditions.

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60,000 lbs

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