Which testing standard applies to hose assemblies that pass hydrostatic testing?

The correct choice refers to the Authority Having Jurisdiction (AHJ), which encompasses the organizations or individuals responsible for enforcing regulations and codes regarding fire safety, including hose assemblies and their testing standards. In the context of hydrostatic testing, the AHJ establishes the specific requirements and guidelines that must be followed for hose assemblies to ensure safety and compliance with local regulations.

The AHJ might reference various standards, including those from organizations like NFPA, but it ultimately holds the responsibility for enforcement and interpretation of codes. Therefore, the AHJ's standards are the definitive source determining the acceptable practices for testing hose assemblies, including the completion of hydrostatic testing.

Other choices, such as ISO Regulations or NFPA Standards, could provide valuable frameworks and guidelines for safety practices, but they do not have the authoritative weight applicable at the local level unless adopted or enforced by the AHJ. Local fire department regulations may also apply, but they are typically guided by the overall authority of the AHJ in a specific jurisdiction.