If a fire alarm system is installed in a building that does not require one, what is true regarding its compliance?

When a fire alarm system is installed in a building that does not specifically require one, the system is categorized as a non-required system. This designation implies that while the system may be designed and installed according to industry standards, such as NFPA 72, it does not have the mandatory enforcement in terms of compliance since it is not required by the building's use or occupancy classification.

The correct answer reflects that the compliance related to NFPA 72 is still relevant, but it doesn't imply full adherence as would be expected in a required system. Non-required systems can still be subject to regulations and codes, but they might have some flexibility concerning the extent of the compliance audits or testing procedures usually mandated for mandatory systems.

This understanding emphasizes that having a fire alarm system in place—even if not required by code—must be recognized for its potential impact on overall fire safety, yet it holds a unique status in the compliance landscape, separate from those systems which are mandated by law.