What is the purpose of a protective cage or shield during testing?

The primary purpose of a protective cage or shield during testing is to allow visual observation while the extinguisher is under pressure. This setup is essential because it provides a safety barrier for technicians and observers, enabling them to monitor the testing process closely without being at risk of injury from potential hazards such as bursting or rupturing of the extinguisher, while still being able to visually assess its operation, pressure levels, and any potential leakage.

The strategy behind using a protective cage or shield focuses on maintaining the safety of the personnel involved in the testing. It serves to contain any fragments or debris should an incident occur and provides a clear view of the extinguisher's performance. This ensures that technicians can effectively verify that the unit is working as intended and adhere to safety protocols, making it a crucial aspect of the testing process.