Generally, because of their limited elasticity, what should web lanyards not be used for in fall arrest systems?

Web lanyards are not designed to stretch significantly during a fall, which is crucial in a fall arrest system to absorb the energy generated when a person falls. The purpose of incorporating a shock absorber is to reduce the amount of force transmitted to the worker and the anchorage point during a fall. If a web lanyard is used without a shock absorber, it would subject the user to high forces upon falling, which could lead to severe injury or even death. This is why web lanyards must always be used in conjunction with a shock absorber when utilized in fall arrest systems.

The other options are less relevant to the specific functionality and limitations of web lanyards in relation to elasticity and shock absorption. Overhead anchorage, wet conditions, or attaching tools can introduce additional risks but don’t directly pertain to the elasticity issue central to lanyard use in fall protection.