Which type of testing requires documentation according to NFPA 72?

The requirement for documentation in testing as outlined by NFPA 72 applies to acceptance testing, re-acceptance testing, and commissioning.

Acceptance testing is performed to verify that the fire alarm system complies with the applicable codes and standards before it is put into service. Documentation is crucial here as it provides proof that the system has been installed correctly and operates as intended.

Re-acceptance testing is necessary when modifications or repairs have been made to the fire alarm system, ensuring that it still meets all requirements and functions properly. This process also requires thorough documentation as it serves to track the integrity and compliance of the system through any changes that occur over time.

Commissioning involves the comprehensive verification process of the system's performance, ensuring that all components are functioning together effectively. Documentation in commissioning provides a detailed account of tests performed, issues found, and resolutions implemented, contributing to the overall reliability of the fire alarm system.

Thus, since all three types of testing require proper documentation to ensure compliance, functionality, and safety of fire alarm systems, it is accurate to conclude that documentation is essential in each case. This thorough record-keeping process supports accountability and assists in future inspections or assessments of the system.