For building owners and facility managers, a Public Safety BDA/DAS system is more than another telecommunications installation. It is life-safety infrastructure designed to help firefighters, police officers, and EMS personnel communicate inside buildings when concrete, steel, low-emissivity glass, and below-grade construction weaken radio signals.

That is why equipment selection matters.

In jurisdictions that have adopted applicable editions of the International Fire Code (IFC) Section 510 or NFPA 1225, active equipment used to provide emergency responder radio coverage generally must be listed in accordance with UL 2524. A non-listed Bi-Directional Amplifier (BDA) can create a serious compliance issue before system commissioning even begins.

However, an important distinction must be understood:

UL 2524 listing applies to equipment. It does not, by itself, approve the complete ERCES or guarantee Authority Having Jurisdiction (AHJ) acceptance.

A compliant project requires both properly listed equipment and a properly designed, installed, tested, documented, and maintained system.

What Is UL 2524?

UL 2524 is the standard for Emergency Responder Communication Enhancement Systems (ERCES), historically described as in-building two-way emergency radio communication enhancement systems.

The standard evaluates equipment intended to improve public-safety radio communication within a specific building or facility. It addresses characteristics such as:

• Electrical and fire-related safety
• RF performance and signal handling
• Bi-directional operation
• Fault detection and supervisory functions
• Alarm and shutdown behavior
• Power supply and battery-charging performance
• Reliability under emergency operating conditions

The current standards landscape includes ANSI/CAN/UL 2524:2024, identified as the third edition. The edition applicable to a specific project depends on the code adoption, project specifications, certification program, and AHJ requirements.

Building owners should not rely on a vendor’s statement that equipment is “designed for public safety.” Request documentation showing that the applicable active components are actually listed for the intended ERCES application.

For additional technical background, review UL Solutions’ ERCES information and the ANSI listing for ANSI/CAN/UL 2524:2024.

Which BDA/DAS Components Are Covered?

UL 2524 primarily addresses active equipment: components that require power and actively amplify, process, transmit, receive, monitor, or control public-safety RF signals.

Depending on the system architecture, equipment subject to UL 2524 listing requirements may include:

• Bi-Directional Amplifiers (BDAs)
• Signal boosters and repeater equipment
• Transmitters and receivers
• Public-safety DAS remote units
• Remote annunciators
• Operational consoles
• Power supplies
• Battery chargers and associated charging components
• Monitoring and supervisory equipment

A BDA is central to many ERCES installations. It receives a donor signal from an exterior source, amplifies the signal, and distributes it throughout the building through a network of coaxial cable, fiber, splitters, couplers, and antennas. It also supports the reverse path so responders can transmit back to the radio system.

The BDA must do more than produce gain. It must operate safely, identify faults, support required alarms, and remain reliable during loss of normal power or other abnormal conditions. These are the types of concerns addressed through equipment certification.

What UL 2524 Does Not Cover

UL 2524 does not generally serve as a listing standard for passive RF distribution components. These may include:

• Antennas
• Coaxial cable
• RF connectors
• Splitters
• Couplers
• Passive taps

Passive components remain important to overall system performance, but they are evaluated through the system design, manufacturer specifications, installation practices, fire-rating requirements, and applicable codes: not through a UL 2524 listing mark.

How IFC 510 and NFPA 1225 Relate to UL 2524

The simplest way to understand the relationship is:

• UL 2524: Determines whether applicable ERCES equipment meets defined safety and performance criteria.
• IFC 510: Establishes building-level requirements for emergency responder radio coverage and references listed equipment.
• NFPA 1225: Addresses emergency services communications, including ERCES design, installation, performance, testing, and maintenance.
• NFPA 72: May govern fire alarm monitoring and supervisory signal interfaces, depending on the adopted code and project requirements.

The IFC Section 510.4 requirements identify the importance of listed equipment for in-building emergency responder coverage. Meanwhile, NFPA’s ERCES guidance explains how these systems support responder communications within buildings.

The exact requirements vary by jurisdiction. Local amendments may affect:

• Required code editions
• Minimum signal strength
• Delivered Audio Quality (DAQ)
• Coverage percentages
• Battery duration
• Pathway survivability
• Enclosure ratings
• Alarm monitoring
• Acceptance testing procedures
• Annual inspection and recertification

Code adoption is local. AHJ approval is project-specific.

UL 2524 Listing Is Not the Same as System Approval

This is the most important point for a building owner.

A BDA can be UL 2524 listed and still be installed in a system that fails inspection. Equipment certification does not prove that the completed ERCES provides adequate coverage throughout the building.

The AHJ may evaluate the complete installation, including:

RF Coverage

Most jurisdictions require documented in-building coverage testing using a defined grid methodology. Common performance criteria may include:

• Approximately 95% coverage in general areas
• Approximately 99% coverage in critical areas
• Minimum signal levels such as -95 dBm, where adopted
• DAQ 3.0 or another specified intelligibility threshold
• Both uplink and downlink performance

Critical spaces may include fire command centers, stairwells, elevator lobbies, fire pump rooms, generator rooms, and other areas designated by the AHJ.

System Design

The system must be engineered for the building’s construction, occupancy, floor area, and radio environment. Design considerations may include:

• Donor signal availability
• Antenna placement
• RF isolation
• Gain and output-power control
• Cable loss
• Fiber distribution
• Frequency bands and public-safety channels
• Interference mitigation
• Zoning and redundancy

Survivability and Power

The ERCES may be required to continue operating during a power outage or fire-related event. The design may include:

• Fire-rated pathways
• Protected cable routes
• NEMA-rated enclosures
• Dedicated power circuits
• Battery backup
• Battery monitoring
• Grounding and surge protection
• Fault annunciation

Monitoring and Alarming

The BDA and related equipment may need to report supervisory conditions to the building’s Fire Alarm Control Panel (FACP) or another approved monitoring location. Conditions can include AC power loss, battery failure, charger failure, amplifier malfunction, donor signal loss, and other equipment faults.

Documentation

AHJs commonly require a complete closeout package containing:

• Approved shop drawings
• RF propagation studies
• Equipment make, model, and listing information
• As-built drawings
• Cable and antenna schedules
• Battery calculations
• Acceptance-test results
• Alarm verification
• Technician credentials
• Operation and maintenance documentation

What Building Owners Should Ask Before Purchasing a BDA

A low equipment price does not necessarily represent a lower project cost. If the equipment is not accepted by the AHJ, replacement, redesign, retesting, and occupancy delays can quickly exceed the original savings.

Before authorizing a BDA/DAS installation, ask:

1. Is the BDA listed to the applicable UL 2524 edition?
2. Can the manufacturer provide verifiable listing documentation?
3. Are the power supply, battery, remote, and monitoring components suitable for the system?
4. Has the design been reviewed against the local IFC and NFPA requirements?
5. Has the AHJ confirmed the proposed equipment and acceptance criteria?
6. Will the system be tested for both uplink and downlink coverage?
7. Will the final documentation support the Certificate of Occupancy?
8. Who will perform annual testing and maintenance after turnover?

Do not accept “UL compliant” as a substitute for a verifiable listing. Ask for the listing evidence and confirm that the equipment is being used within its approved application.

A Compliance-First Project Path

A reliable ERCES project begins before installation.

1. Confirm the Jurisdiction

Identify the adopted editions of IFC 510, NFPA 1225, NFPA 72, and any local amendments. Coordinate with the Fire Marshal or other AHJ before equipment is ordered.

2. Perform a Professional RF Survey

A pre-installation survey can identify dead zones, donor signal limitations, critical areas, and system complexity. It also helps determine whether an ERCES is required.

3. Specify Listed Equipment

Use active components with the appropriate UL 2524 listing and public-safety frequency compatibility. Equipment should be suitable for the facility’s operating environment and monitoring requirements.

4. Engineer for Coverage and Survivability

The system must be designed to meet coverage, DAQ, isolation, power, alarm, and pathway requirements: not merely to produce a strong signal in selected rooms.

5. Commission and Document the System

Acceptance testing should include grid measurements, alarm verification, backup-power testing, and all other procedures required by the AHJ.

6. Maintain Annual Readiness

An ERCES is not “complete” when the Certificate of Occupancy is issued. Ongoing inspection, testing, battery service, monitoring, and documentation preserve compliance and operational readiness.

0% Defects. 0% Missed Deadlines. Readiness when it matters most.

Why Partner with Global Network LLC?

Global Network LLC provides Public Safety DAS/ERCES design, installation, commissioning, compliance testing, and maintenance for commercial, institutional, healthcare, hospitality, government, and educational facilities.

For building owners and facility managers, that means one accountable partner for the technical and compliance details that influence safety and occupancy:

• UL 2524 equipment verification
• IFC 510 and NFPA 1225 planning
• RF surveys and grid testing
• BDA/DAS design and installation
• FACP monitoring coordination
• Backup-power and survivability planning
• AHJ documentation and acceptance support
• Annual performance testing

As Atlanta’s local DAS/ERCES specialist, Global Network LLC combines code-compliance expertise with practical field experience. Explore the company’s Public Safety DAS and ERCES services, review the Certificate of Occupancy compliance checklist, or request a compliance consultation.

Protect Your Building’s Approval and Emergency Communications

UL 2524 listing is a critical starting point for a compliant Public Safety BDA/DAS system. But equipment certification alone is not enough.

Your building also needs a system that performs across the required coverage areas, survives expected emergency conditions, reports faults, passes acceptance testing, and satisfies the local AHJ.

Do not wait until the final inspection to discover that your equipment, design, or documentation is insufficient.

For professional assistance, call Global Network LLC at 770.520.7633 or 877.231.1084. Visit globalnetworkco.com to schedule a consultation and move your ERCES project toward approval with confidence.