A bi-directional amplifier that passed its acceptance test the week a building opened proves nothing about whether it still passes today. Signal coverage measured at occupancy is a snapshot, not a warranty. A system that satisfied the fire code official’s radio survey in 2022 can fail that same survey in 2026, and nobody finds out until someone tests it again.

What the annual test requires, and when it started

The clearest written statement of that expectation is the International Fire Code, Section 510.6.1 (2021 edition). It requires the emergency responder radio coverage system to be inspected and tested at minimum once every 12 months, and again after any structural change that could affect performance, with the results documented for the fire code official. That annual retest requirement is new. It first appeared in the 2021 IFC. The 2018 edition addressed acceptance testing for a newly installed system, in Section 510.5.4, but had no separate clause requiring the system to be tested again once the building was occupied.

That distinction matters for anyone assuming a BDA is finished once it passes the first walk-through. Under the 2021 IFC, passing at occupancy is the start of an obligation, not the end of one.

Why Kentucky is different

Kentucky building owners should not assume IFC 510.6.1 applies to their address, because Kentucky’s statewide fire code is not the International Fire Code. The Kentucky Standards of Safety, 815 KAR 10:060, incorporates NFPA 1, Uniform Fire Code, 2018 edition, by reference. The regulation does not mention the International Fire Code or Section 510 anywhere in its text.

That means a Kentucky building’s annual testing obligation runs through NFPA 1 and through whatever the local fire code official decides to enforce, not automatically through IFC 510.6.1. IFC 510.6.1 is still worth knowing. It is the most specific written description of an annual ERRCS test in any model code in wide use, and plenty of Kentucky jurisdictions and insurers hold buildings to something functionally close to it. But a Kentucky facility manager should not tell an inspector the state code requires an annual test under that section number, because it doesn’t. Confirm with the local AHJ what interval and documentation format they expect, and treat 510.6.1 as the industry benchmark rather than the statute on the books.

What the test actually measures

An annual test is a walk of the building with a calibrated signal meter, repeating the same measurement taken at commissioning. IFC Section 510.4.1 sets the bar in both the 2018 and 2021 editions: inbound signal strength of at least -95 dBm, with a Delivered Audio Quality of 3.0, across not less than 95 percent of general building areas on each floor. The 99 percent threshold for critical areas, meaning fire command centers, exit stairs, and elevator lobbies, sits inside 510.4.1 itself only in the 2021 edition. In the 2018 edition it arrives through Section 510.4.2’s reference to NFPA 1221, per the same code comparison guide. Same number, different path to it, and worth confirming which edition the local AHJ has adopted before a test report cites a section.

Those thresholds do not change year to year. What changes is whether a given floor still clears them. A test that only confirms the head-end equipment powers on says nothing about whether a stairwell that measured clean at occupancy still does.

The standby power requirement

The battery backup gets tested too, not just the radio signal. IFC Section 510.4.2.3 (2018 and 2021 editions) requires the standby power supply to run the ERRCS system at 100 percent capacity for not less than 12 hours, down from 24 hours under the 2015 IFC, per the same code comparison guide.

Batteries age. A backup system that met the 12 hour requirement when installed can fall short three or four years later with no visible sign, because the shortfall only shows up once utility power actually goes out. An annual test should include a load test of the standby power supply, not a glance at the panel to confirm the indicator light is green.

Why coverage drifts after occupancy

A BDA is tuned to a building as it exists on the day of the acceptance test. Buildings do not stay that way. Tenant build-outs add partition walls. Warehouse racking fills in what was open floor space. Metal-backed insulation, added HVAC equipment, and denser storage all change how radio signal travels through a floor plate that used to be empty. None of that appears on a maintenance log unless someone goes back and measures it.

That is the practical case for the annual test, apart from any code citation. The system a builder commissioned is not necessarily the system a tenant operates inside four years later.

What the research says about why this matters

The National Institute of Standards and Technology’s Technical Note 1850, “Performance of Portable Radios Exposed to Elevated Temperatures”, remains the landmark study on how firefighter radios behave under fire conditions. No newer study of the same scope has replaced it since it was published in 2014. NIST tested 7 portable radios from 3 manufacturers. All 7 failed to perform properly within 15 minutes at 160°C (320°F), a temperature representative of a fully involved fire. Four of the radios stopped transmitting outright. Three showed signal drift severe enough to make them unreliable. Three never recovered normal function even after they cooled back down. The manufacturers’ own stated maximum operating temperature for these radios was 140°F, well below the test condition.

That study covers the radios themselves, not building coverage systems, but it points at the same underlying fact: emergency communications inside a structure fire are fragile under conditions that are entirely foreseeable. That is the condition a BDA exists to compensate for on the building side.

A single incident investigation illustrates the same point from a different angle. On December 22, 2010, Chicago Firefighters Edward Stringer and Cory Ankum were killed and 19 others injured when the bowstring truss roof of an abandoned commercial laundry building collapsed during firefighting operations. The National Institute for Occupational Safety and Health’s Fire Fighter Fatality Investigation, Report F2010-38, released in 2011, lists missing radios among the contributing factors, alongside a lack of hazard information about the unsecured structure and staffing levels relative to the task. That report investigates one incident, and it credits several factors together. Read on its own terms, it shows that when investigators examine a fireground fatality closely, radio reliability is one of the things they check.

Documentation checklist for the building file

A facilities coordinator should be able to hand a fire code official this file with no delay. Keep the following on hand, updated after every test cycle:

• Most recent annual test report, dated and signed by the testing company, with pass or fail results measured against the applicable signal thresholds.
• Floor-by-floor signal readings, in dBm and DAQ, for both general areas and critical areas (fire command center, exit stairs, elevator lobbies).
• Standby power test results, with measured runtime at full system load, not just a pass/fail note.
• Original acceptance test report from system commissioning, kept as the baseline for comparison.
• Structural change log covering renovations, tenant build-outs, or added partitions since the last test, and whether each one triggered a retest.
• Written record of what the local AHJ has specified for testing interval and documentation format, an email or letter on file, not a verbal understanding.
• Device-level inspection history for the head-end equipment, antennas, and batteries, including install dates and battery replacement dates.
• Current service or maintenance contract covering ERRCS/BDA testing, including who is responsible for scheduling the next one.

If any one of those eight items is missing, that is the gap to close first, not the whole system.

What this looks like when it’s handled well

A working file means a facilities coordinator can produce the annual test report, the floor-level signal data, and the standby power results before the fire code official finishes asking for them. It means someone put next year’s test on the calendar the day this year’s test finished, instead of waiting for a reminder from an inspector.

Versys installs and services ERRCS and BDA systems across Kentucky and Southern Indiana, and tracks device-level inspection records through the same barcode-based system, Building Reports, used for fire alarm devices. That keeps the annual radio coverage test on the same schedule as the rest of a building’s fire protection equipment instead of drifting on its own.

If it has been close to a year since the last documented test, or nobody in the building can say when that test happened, call Versys at (270) 358-2200.