Glossary

Fire protection has a working vocabulary, and most of it never gets defined where a contractor can find it. A deficiency and an impairment are different things under NFPA 25 (2023 edition), and the difference decides whether a finding waits for a proposal or a fire watch starts tonight. This glossary covers the words that show up on inspection reports, tags, and letters from the AHJ, defined the way they are used on a job, with the standard that backs each one.

It is written for the people who have to use these words under pressure: the tech filling out the report in the truck, the office manager explaining a red tag to a customer on the phone, and the building owner deciding what NFPA 25 or NFPA 72 actually requires of them this week.

Every entry holds itself to the same standard. A definition a tech would say out loud. The term it gets confused with, because most of these words travel in pairs. And a citation with standard, edition, and section, or an honest "trade convention, not codified" when no code defines it. An entry that cannot meet that bar does not go up.

All terms

Adopted edition: The edition of a code or standard your state or city actually enforces, which is usually not the newest one NFPA sells.
AHJ (authority having jurisdiction): The AHJ is whoever can approve or reject the work: sometimes the fire marshal, sometimes the building official, the state, or the insurance company.
Central station monitoring: A listed company monitors your alarm signals and, under the same contract, handles runner response, testing, and record-keeping.
Certificate of fitness: An FDNY card that says one named person passed the test to do one specific task, like standing fire watch. It belongs to the tech, not the company.
Confidence testing: It's what Seattle and most of Puget Sound call the routine fire system inspection and testing the rest of the country calls ITM.
Critical deficiency: The system is still in service, but this finding can materially hurt how it performs in a fire, so it gets fixed first.
Deficiency: Something on the system is wrong or slipping out of spec, but the system is still in service. It gets reported and corrected, not shut down.
Annual maintenance (portable extinguishers): The once-a-year hands-on service check on each portable extinguisher, done by a trained tech, with the date recorded on the tag.
Fire watch: Somebody walking the building watching for fire because the sprinklers or the alarm are down, ready to call the fire department the moment they see smoke.
Five-year certification: The heavy five-year service California requires on sprinkler and standpipe systems: licensed company, full test battery, state label on the riser when it passes.
Functional test: A functional test makes the device actually operate and proves the signal landed. If nobody flowed water or tripped anything, it was just a look.
Impairment: The system is out of service, in whole or in part, and cannot be counted on to work in a fire.
Impairment coordinator: The person the owner puts in charge when a sprinkler, standpipe, or alarm system goes down. If nobody gets named, the owner is it.
ITM (inspection, testing, and maintenance): ITM is the whole program: inspecting the system, testing it to prove it works, and maintaining it so it keeps working, each on its own schedule.
Local amendment: The state or city changed the code book before adopting it, so the enforceable text is their amended version, not the printed model code.
NFPA 25: The standard that tells you how often to inspect, test, and maintain sprinklers and every other water-based fire protection system once it is in service.
Obstruction investigation: The deep look inside sprinkler pipe you do when something shows the system is obstructed, to find out what the material is and how far back it goes.
Owner's responsibility: The building owner, not the contractor, is the one NFPA 25 holds accountable for maintaining the system and fixing what the inspection report finds.
Qualified personnel: Somebody the AHJ will actually accept as competent to inspect, test, or maintain the system, usually proven by a state license or a NICET card.
Record of completion: The form the installer fills out once, when a new or altered fire alarm system is accepted: the system's birth certificate, not its checkup.
Red tag: A red tag on the riser means the system is out of service and cannot be counted on in a fire.
Supervisory signal: The panel telling you something it watches is off normal, usually on the sprinkler side: a closed valve, low air, a pump problem. The alarm system itself is fine.
Trouble signal: The panel is saying something is wrong with the alarm system itself, like a dead battery or a cut wire, not that there is a fire.
Violation: The fire marshal wrote it up: a formal citation under the adopted fire code, with a deadline to correct and penalties behind it.
Witness test: A witness test is a test the AHJ's inspector watches you run in person, instead of just reading your report afterward.
Yellow tag: It means the system has problems but it still works. It is not an emergency and it is not out of service.