A full body harness lanyard must be a minimum of what size in rope or equivalent?

The minimum size for a lanyard used with a full body harness is 1/2" nylon. This size is chosen for its strength, durability, and ability to withstand the forces associated with fall arrest. A lanyard made from 1/2" nylon provides adequate tensile strength to support the weight of a person and any dynamic forces experienced during a fall.

Nylon is particularly favored for its elasticity and resistance to abrasion, making it suitable for situations where a degree of flexibility is necessary. This quality helps to absorb some impact during a fall, thereby reducing the risk of injury. Additionally, a diameter of 1/2" strikes a balance between safety and maneuverability, making it easier for workers to handle while ensuring they are properly secured.

Using lanyards that are either too small or made from materials with lower strength could compromise safety, while larger diameters may add unnecessary bulk, hindering movement. Thus, the 1/2" nylon standard meets the safety requirements while providing practicality for everyday use in various job sites.