Explain how the concept of 'arrest force' relates to the selection of a suitable self-retracting lifeline (SRL) for a tower climber.

Arrest force is the maximum force exerted on a worker's body during the sudden stop of a fall when using a fall protection system. When selecting a self-retracting lifeline (SRL) for a tower climber, the arrest force rating of the SRL must be carefully considered to ensure it is compatible with the worker's weight and the characteristics of the fall. The goal is to select an SRL that will arrest the fall quickly and safely while limiting the maximum arrest force to a level that will not cause serious injury to the worker. OSHA regulations and ANSI standards specify maximum allowable arrest force limits. An SRL with a lower arrest force rating is generally preferred because it reduces the impact on the body during a fall. However, the SRL must also be capable of arresting the fall within a safe distance to prevent the worker from striking the ground or other objects. Therefore, selecting an SRL involves balancing the need for a low arrest force with the requirement for adequate fall clearance and proper functionality for the specific tower environment and climber's weight.