According to NFPA 25, when should the sprinkler system be tested after a system repair or alteration?

When a sprinkler system undergoes repair or alteration, it is crucial to conduct testing immediately after completing the work. This immediate testing ensures that all components are functioning correctly and that the system will perform as intended in the event of a fire. NFPA 25 emphasizes the importance of verifying the integrity and performance of the system following any modifications, as these changes can affect its operational capabilities.

Testing right away allows for the identification of any potential issues that may have arisen during the repair or alteration process. It helps ensure that any necessary adjustments can be made promptly, thereby maintaining the safety standards required for fire protection systems. This approach emphasizes proactive maintenance and ensures that the system is always ready to protect lives and property.