Which of the following is the required action if changes are made to system hardware?

When changes are made to system hardware, performing re-acceptance testing is essential to ensure that the fire alarm system operates correctly and meets the necessary codes and standards. This testing verifies that any modifications or replacements have not compromised the system's integrity and functionality. The re-acceptance process typically involves thorough inspection and testing of all components, including alarm signals, notifications, and monitoring aspects.

These tests confirm that the changes do not interfere with the system's performance or reliability, which is critical for life safety systems like fire alarms. It ensures that the system is still capable of detecting and responding to fire conditions as designed. Maintaining compliance with codes, standards, and local regulations is paramount in the fire alarm industry, and re-acceptance testing is a key step in that process.