What is a system called that serves as a backup to the primary system in safety applications?

A redundant system is designed specifically to provide a backup for the primary system in various safety applications. The purpose of redundancy is to enhance safety and reliability by ensuring that if the primary system fails or experiences an error, the backup can immediately take over to avert potential hazards. This is crucial in confined space rescue operations where failures can lead to catastrophic consequences.

In this context, having a redundant system can mean additional safety measures, equipment, or protocols that are ready to be activated if the primary measures do not perform as expected. This redundancy not only helps in keeping personnel safe but also instills confidence in the operation's overall safety protocols.

Other terms like support system, secondary system, and contingency system might refer to related concepts but do not encapsulate the same level of direct backup as a redundant system. For instance, a support system may assist but not necessarily provide an immediate substitute, while a contingency system implies planning for potential failures rather than having an instantaneous backup in place.