What is one of the mandatory fall protection methods for climbing higher than 4 ft?

A mandatory fall protection method when working at heights greater than 4 feet is a personal fall arrest system. This system is designed specifically to protect individuals from falling and includes components such as a harness, lanyard, and anchorage point. The personal fall arrest system works by stopping a fall before the individual reaches the ground, minimizing the risk of injury.

Using this system correctly is vital for maintaining safety regulations and ensuring that workers are protected during activities that involve climbing or working at elevated positions. While other methods may also be used in various situations, the personal fall arrest system is universally recognized as a crucial safety measure in the context of work at height.