When assessing a sprinkler system, if 100% of represented sprinklers fail testing, what must be done?

In the scenario where 100% of the represented sprinklers fail testing, the appropriate action is to replace all failed sprinklers. This approach is guided by the principle that sprinklers must be reliable to ensure adequate fire protection. If every sprinkler in the tested group fails, it indicates a significant issue that cannot simply be ignored or rectified by partial replacement or retesting.

Replacing all failed sprinklers ensures that the integrity of the entire system is restored, thereby meeting safety standards and regulations. Fire safety protocols dictate that any components that have failed to perform as intended must be fully addressed, as leaving non-functional sprinklers can compromise the overall effectiveness of the fire protection system. Additionally, simply retesting the system without addressing the issue or replacing the failed components would not provide assurance of safety or compliance with industry standards.

This comprehensive replacement strategy reinforces the system's reliability and helps in mitigating risks associated with fire hazards, thus safeguarding lives and property.