Originally Posted On: https://www.marconitech.com/2026/09/10/how-to-keep-an-arc-system-fdny-compliant-during-nyc-building-renovations/
What You'll Need Before You Touch the ARCS Equipment
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Original FDNY ARCS approval letter and as-built site plans (IB Wave drawings if you have them)
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Current radio test report from your last commissioning or annual inspection
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FDNY Bureau of Fire Prevention contact for your borough, plus your ARCS vendor's 24/7 support line
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A licensed low-voltage or fire alarm contractor familiar with head-end wiring and antenna runs
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Building's general contractor and structural engineer in the loop before any steel or concrete work starts near antenna paths
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Spectrum analyzer or field strength meter for re-testing signal coverage post-renovation
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Battery backup and power specs for the ARCS head-end, in case of temporary shutdowns
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Time estimate: 2-4 weeks for notification, protection planning, and re-commissioning on a typical high-rise floor-by-floor renovation — longer if structural work touches multiple risers
Rip open a wall in a Midtown high-rise — you're not just disturbing drywall — you're potentially disturbing a life-safety system that FDNY inspectors take dead seriously. An ARC system FDNY has approved for your building isn't a set-it-and-forget-it install. It's a certified network of antennas, cabling, and a head-end unit that firefighters rely on to talk to each other inside steel and concrete structures where regular radios die. Renovation crews cut through walls, reroute conduit, and swap out ceiling grids without a second thought about what's running behind them. That's how buildings end up with a red tag on move-in day.
Here's the honest answer: keeping your ARC system FDNY-compliant during a gut renovation takes more than telling your contractor to "work around it." It takes documentation, coordination with FDNY before the first wall comes down, and a re-commissioning test before anything gets closed up. Skip a step, and you're looking at a failed inspection, a stalled certificate of occupancy, or worse — a system that doesn't work when it matters. Let's get into exactly what NYC compliance managers need to do, in order.
What You'll Need Before You Touch the ARCS Equipment
Picture this: a contractor on the 22nd floor of a Midtown high-rise cuts power to a closet during a gut renovation, not realizing the rack inside feeds the building's arc system FDNY inspectors rely on for radio coverage. That's an automatic violation waiting to happen — and it's avoidable.
Required Documents and FDNY Contacts on Hand
Before any wall comes down, pull the original ARCS certification package, the as-built drawings, and your assigned FDNY Bureau of Fire Prevention contact number. Keep the last inspection report too — you'll need it for reference.
Tools and Team: Who Needs to Be in the Room
Get your fire safety director, the low-voltage contractor, and whoever installed the in-building radio system together before demo starts. Bring a signal meter, spare battery units, and a spare antenna cable. Skip this step, and you'll be re-testing the whole floor later. Not fun.
Step 1: Pull Your Existing FDNY ARCS Certification and Site Plans
Locating Your Original Approval Letter
Don't touch a wall panel until you've found the paperwork. Every arc system FDNY installation gets commissioned with a formal FDNY approval letter, a set of as-built drawings, and a signal test log — and renovation permits get flagged fast when those documents can't be produced on request.
Check the fire command center binder first. If it's missing, your building's auxiliary radio communication system service provider should have a copy on file, since they handled the original commissioning and signal mapping.
Also confirm whether your building runs a hybrid setup with a separate bidirectional amplifier company handling cellular or non-FDNY bands. Renovations affecting steel, concrete, or unit layouts can shift signal paths, so having both sets of plans on hand before demo starts saves weeks of back-and-forth with the inspector.
Step 2: Notify FDNY and Your AHJ Before Renovation Work Begins
Who's supposed to make the first call when a renovation touches life-safety systems? That falls on the building's fire safety director, not the contractor. Before any demo or wiring work starts near your radio equipment, FDNY's Bureau of Fire Prevention and your local AHJ need written notice describing the scope of work and the timeline.
Buildings running an FDNYauxiliary radio communication system face extra scrutiny here — FDNY wants to confirm coverage won't drop during construction, even temporarily. Include floor plans showing antenna locations and note any walls being added or removed.
Don't skip this step because it feels like paperwork. Buildings mixing BDA and ERCEs equipment sometimes assumes renovation notice only applies to fire alarm work. It doesn't.
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Submit notice at least 10 business days ahead
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Attach current test/inspection reports
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Name a site contact available during work hours
Step 3: Protect the ARCS Head-End and Antenna Runs During Construction
Here's a number that should stop you cold: roughly 60% of ARCS deficiency tags FDNY inspectors write on renovation projects trace back to damaged antenna cable or a head-end cabinet buried behind new drywall. That's not a small unit repair — it's a failed test day and a delayed sign-off. Any arc system FDNY installation running through a building under renovation needs a documented protection plan before demo even starts, not after someone finds a severed run.
Coordinating With Contractors on Steel and Concrete Work
Steel and concrete crews rarely know where riser cable sits inside a wall cavity. Mark every conduit path on the drawings contractors actually carry, and require a walk-through before any coring. Marconi's in-building emergency responder radio systems ship with as-built documentation specifically so field crews aren't guessing.
Temporary Shutdowns: What's Allowed and What's Not
FDNY doesn't allow open-ended outages. Notify the local ARC fire services unit, log the shutdown window, and restore coverage same-day whenever possible.
Step 4: Re-Test and Re-Commission the ARC System Before Closing Walls
Most contractors assume a quick visual check is enough before sheetrock goes back up. It isn't. That's the myth that gets buildings a failed inspection and a torn-out wall two weeks later.
Once wiring, ladder-style cable runs, or antenna placement shifts even a few feet during renovation, signal strength changes — sometimes drops below the threshold FDNY requires. A proper re-test means keying up each floor, checking every unit on the panel — confirming the console still reads a clean signal with no shock or dropout during a simulated call.
Don't rely on the original commissioning report. Bring in an in-building radio system company to walk the floors again before the walls close. Marconi Technologies also works as an in-building radio system service for buildings mid-renovation, verifying compliance before the inspector ever shows up.
Common Mistakes That Get Renovation Projects Flagged by FDNY
Picture a Midtown high-rise gutting three floors for a tenant fit-out. The contractor moves a stairwell wall six inches — forgets the antenna cable running behind it — inspection day arrives, and the arc system FDNY check fails cold. That's the most common flag: crews treating radio infrastructure like an afterthought instead of a core life-safety system.
Other repeat offenders show up on nearly every violation report:
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Capping or relocating antenna runs without updating as-built drawings
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Skipping signal testing after drywall or steel work changes signal band performance
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Swapping in a non-listed arc fire alarm component to save time on a rush job
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Failing to loop in the fire safety director before demo starts
Buildings relying on outdated in building radio communication setups often don't realize renovation work has degraded coverage until FDNY runs the test. And once flagged, the project stalls — no certificate of occupancy, no move-in date, no exceptions.
Verifying Compliance and Closing Out the Renovation With FDNY
Nobody gets a clean sign-off by guessing. Once the arc system FDNY work wraps up, the building's fire safety director needs documented proof — not a verbal assurance from the electrician — that every repeater, antenna, and cable run performs to spec after the renovation dust settles.
Before scheduling the final walkthrough, pull together your acceptance test reports, updated as-built drawings — and any change orders tied to the ARCS scope. FDNY inspectors will check signal strength floor by floor, confirm battery backup runtime, and verify the annunciator panel still reports accurately after wall or ceiling changes.
If coverage dropped in any stairwell or elevator bank during construction, don't wait for a failed test to address it. A qualified bidirectional amplifier service team can re-tune antennas and confirm dB levels meet FDNY thresholds before the inspector even shows up. That's the difference between a same-day close-out and a re-inspection headache.
How-To FAQ
What is FDNY ARCS?
FDNY ARCS stands for Auxiliary Radio Communication System — the dedicated radio network NYC high-rises must install so firefighters keep clear signal on every floor during an incident. Unlike a standard bi-directional amplifier setup used in most of the country, ARCS is built around FDNY's own frequency plan — stairwell command posts, which is why the borough's dense steel-and-concrete construction needs its own approach.
What is an ARCS system, exactly, versus a BDA?
An ARCS system is a self-contained radio network with its own base station, antennas, and firefighter handsets — it doesn't just boost outside signal as a BDA does. In NYC, FDNY requires ARCS instead of a BDA for most high-rises because it gives incident commanders a dedicated channel that isn't dependent on outside carrier coverage.
What type of radio system does FDNY use?
FDNY units communicate over their own UHF frequencies through the building's ARCS base station, not the commercial cell or public-safety bands you'd see with a typical BDA install elsewhere. That's the whole reason renovation crews can't treat this like swapping out a fire alarm panel — touch the wrong antenna run, and you've cut off a firefighter's radio mid-response.
Does NYC offer free smoke detectors?
Yes — FDNY runs a program that provides free smoke and carbon monoxide detectors to eligible NYC residents, but that's a separate life-safety initiative from ARCS compliance. Building owners handling an ARCS renovation should still check in with their fire safety director about smoke detector requirements as part of the broader inspection, since both get reviewed during a compliance walkthrough.
How long does re-certification take after a renovation?
Realistically, budget 2 to 4 weeks once construction wraps — that covers re-testing every floor, filing paperwork, and scheduling the FDNY inspector. Rushing this step is exactly how projects end up flagged and sent back for a second round of testing.
Can we keep the ARC system running during demolition?
In most cases, no — if crews are cutting into walls near the head-end or antenna runs, the system needs a documented, approved shutdown window. Leaving it live during that work risks damaged cable runs and a failed signal test down the line, so coordinate the shutdown with your AHJ before the first wall comes down.
Renovations don't have to put a building's ARCS approval at risk. The projects that sail through FDNY closeout are the ones where someone pulled the original certification paperwork before demo started, kept the AHJ in the loop instead of surprising them at inspection, and treated the head-end and antenna runs like the life-safety equipment they are — not just another obstacle for the electricians. Skip any of that, and re-testing an arc system FDNY inspectors will actually sign off on becomes a scramble instead of a formality.
Steel and concrete work near antenna runs is where most violations start. Protect that infrastructure early, and re-commissioning before the walls close becomes routine rather than a fire drill.
If your building's renovation timeline is already set and you haven't looped in a certified ARCS provider yet, don't wait for a failed inspection to force the issue. Call Marconi Technologies at (212) 376-4548 and get an engineering consultation scheduled before the next phase of construction begins.
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