For rope lengths not exceeding 915 meters, the maximum safe working load shall not exceed what fraction of the breaking load?

For rope lengths not exceeding 915 meters, the maximum safe working load shall not exceed what fraction of the breaking load?

• A. 1/5
• B. 1/4
• C. 1/3
• D. 1/6

Answer: (A)

When determining safe rope use, the working load is kept well below the rope’s breaking load to cover peak stresses, dynamic shocks, wear, and other real-world factors. For rope lengths up to 915 meters, the standard sets the maximum safe working load at one-fifth of the breaking load. This provides a solid safety margin against sudden overloads that can occur during operation over that distance. So if the rope’s breaking load is, for example, 100 kN, the safe working load would be limited to 20 kN. For longer ropes, the fraction is typically reduced further (such as one-sixth) to account for greater dynamic losses, but within the 915 m limit, one-fifth is the appropriate bound.

When determining safe rope use, the working load is kept well below the rope’s breaking load to cover peak stresses, dynamic shocks, wear, and other real-world factors. For rope lengths up to 915 meters, the standard sets the maximum safe working load at one-fifth of the breaking load. This provides a solid safety margin against sudden overloads that can occur during operation over that distance.

So if the rope’s breaking load is, for example, 100 kN, the safe working load would be limited to 20 kN. For longer ropes, the fraction is typically reduced further (such as one-sixth) to account for greater dynamic losses, but within the 915 m limit, one-fifth is the appropriate bound.