Ontario Office of the Fire Marshal (OFM) NFPA Technical Rescue (NFPA 1006) Written Practice Exam

To determine the safety ratio, you divide the minimum breaking strength of the rope by the maximum load that will be applied. In this case, the minimum breaking strength of the rope is 6000 lbf, and the maximum load it will experience is 600 lbf.

Calculating the safety ratio involves the following steps:

1. Identify the minimum breaking strength of the rope: 6000 lbf.

2. Identify the maximum load: 600 lbf.

3. Use the formula for the safety ratio: Safety Ratio = Minimum Breaking Strength / Maximum Load.

Plugging in the values:

Safety Ratio = 6000 lbf / 600 lbf = 10.

This results in a safety ratio of 10:1, which indicates that the rope can handle 10 times the maximum load applied to it, providing a significant margin for safety. A safety ratio of 10:1 is often used in safety-critical applications, as it helps ensure the equipment operates well within its limits, accommodating potential factors such as wear, dynamic loads, or unforeseen circumstances.