What are the typical uses of a Jack Line in theatre?

A Jack Line is primarily used in theatre as a safety measure for personnel working at height. Specifically, it is a strong rope or line that is anchored securely and allows technicians and performers to secure themselves while working on stage or in rigging areas. This safety line prevents falls and ensures that individuals can move safely in elevated positions.

While the option regarding using a Jack Line to assist in pulling up heavy line systems may seem relevant, the core function of a Jack Line is not about managing weight or rigging systems directly; rather, it emphasizes safety. The use of a Jack Line is integral in situations where workers are at risk of falling, ensuring they are tethered and secure as they operate in potentially hazardous environments.

Regarding the other options, using a Jack Line purely as an organizational tool for crew movements or for controlling stage lighting effects does not capture its primary role in promoting safety. Its essential function revolves around fall protection and ensuring that personnel can work confidently and securely at heights.