An overview of the new edition and what it could mean for California
IBWS has reviewed the 2027 edition of NFPA 1225 against the 2022 edition, with particular attention to Chapter 18, In-Building Emergency Responder Communications Enhancement Systems, and the ERCES testing requirements in Chapter 20.
One idea runs through the revisions. An ERCES has to do more than look correct on a drawing or pass isolated measurements. It has to perform under the RF conditions that occur when first responders are actually using the system, and a building has to be measured before a system can be required at all.
A second thread is less obvious but may matter more over time. Across several sections, the frequency license holder is integrated into the system’s life rather than just its permit. Remote shutdown is available where the license holder requires it. Local shutdown is available where the license holder or the AHJ requires it. Qualification now includes understanding the license holder’s requirements. For project teams, the radio authority becomes a party to the schedule.
Below are six changes owners, architects, engineers, contractors, and AHJs should have on their radar, followed by a short list of other revisions worth noting. One caveat: the new version is just out, and we’ve reviewed 2027 online. We’re still reviewing this, so this information may be revised later. Please contact us if you’ve got additional (or contradictory) information.
1. Buildings Must Be Evaluated Before an ERCES Is Required
New Section 18.1.1 requires an evaluation of new and existing buildings to determine whether adequate RF coverage from the public safety communications system already exists before requiring an ERCES. The evaluation is tied to the coverage and signal-quality criteria in Sections 18.8 and 18.9.
This formalizes an important principle: first determine whether the building actually has a coverage problem, then determine whether an ERCES is needed to solve it. For owners, this can be consequential. A properly performed RF evaluation could establish that the building already meets the required performance criteria and that an enhancement system is unnecessary.
2. Near-Far Becomes an Explicit Performance Issue
The near-far problem was recognized in the 2022 edition, but the 2027 edition goes further. Section 18.3.4 now requires the ERCES to support two portable radios transmitting simultaneously on different talk paths or channels, with one radio at the location with the strongest signal and the other at the location with the weakest signal.
This matters because a strong radio close to a distribution antenna can cause a signal booster to reduce gain. That gain reduction can prevent a weaker radio elsewhere in the building from reaching the public safety network. A system can therefore pass conventional coverage testing one radio at a time and still have a near-far problem.
The 2027 Annex provides extensive guidance on AGC, uplink dynamic range, antenna-system balance and near-far testing. This is one of the changes we will examine in detail, including what it means for commissioning and acceptance testing.
3. Qualified Personnel Requirements Become More Specific
Section 18.2.3 sets out more detailed qualification requirements for RF system designers and for personnel who install, test, and maintain ERCES. The requirements cover state or local registration, licensing, or certification; AHJ-accepted certifications; and manufacturer certification for the specific type and brand of equipment used.
The RF system designer must also be identified on the system design documents. The accompanying Annex discusses the knowledge expected of qualified personnel, including RF principles, frequency-license-holder requirements, codes and standards, system architecture, noise, near-far conditions and troubleshooting.
Practically, this changes who is eligible to bid ERCES work. It favors firms that can produce credentials on request rather than assemble them after award.
4. New Distribution Antenna Cable Rules
Two new provisions clarify an area that has caused considerable industry confusion. Section 18.12.3.8 states that distribution antenna cables are not required by NFPA 1225 to have a fire-resistance rating.
The reasoning is explained in Annex A.18.12.3.8:
“The antenna could fail before the cable serving the antenna. Therefore, requiring rated cables would be an undue burden without any added guarantee of system performance.”
At the same time, Section 18.12.3.9 limits a single distribution antenna cable to no more than one floor or an area greater than 50,000 square feet. Rather than requiring fire-rated distribution antenna cable, NFPA addresses survivability by limiting how much of the building can depend on a single distribution path.
It is important to note that the 2027 edition is clarifying this issue, not eliminating a previous NFPA requirement for fire-rated distribution antenna cable. During development of the new edition, the NFPA technical committee specifically stated that previous and current editions did not require fire-resistance-rated distribution antenna cables and that the new language was intended to address persistent industry confusion.
The distinction between distribution antenna cable and backbone cable is important. The new language in §18.12.3.8 applies specifically to distribution antenna cable; the separate pathway survivability requirements for backbone cables remain in §18.12.3.
5. Signal Booster Shutdown Is Now Addressed Directly
New Section 18.16 establishes a framework for signal booster shutdown. Where required by the frequency license holder, an ERCES must provide remote shutdown capability and the information needed to access it. The remote shutdown function must be tested during initial acceptance and annually.
The section also addresses local signal-booster shutdown, required by the frequency license holder or AHJ, including a physical disconnect and requirements for restoring RF amplification. The scope is broader than a switch. The disconnect must disable RF amplification, its wiring must meet physical protection requirements, and the change of state must annunciate within a defined time. These are line items a contractor prices and an owner does not expect.
The practical objective is straightforward: those responsible for the public safety radio network need a way to disable an ERCES that is causing harmful interference or other network problems.
6. ERCES Testing Is More Explicit
The 2027 edition places detailed ERCES testing requirements in Chapter 20. These requirements cover initial acceptance, documentation, annual operational testing, and longer-term testing.
One notable provision requires that the public safety radio signal outside the building be evaluated before periodic ERCES testing to determine whether it matches the performance level at the donor antenna when the system was initially accepted. This helps distinguish a problem with the building’s ERCES from a change in the external public safety radio environment.
Annual testing also addresses items such as DAQ, signal-booster gain, batteries and power supplies, active components, oscillation or interference, and donor isolation where applicable.
Also Changed in Chapter 18
The six changes above are the ones with the widest reach, but they are not the whole revision. Also worth knowing:
- AHJ technical criteria (18.15.4). Criteria documents must now address noise and interference parameters, downlink and uplink performance outcomes, and uplink receive antenna gain and sensitivity. New work for AHJs, and data designers have needed for years.
- Monitoring (18.14). Fire alarm supervision applies where a fire alarm system or dedicated function control unit is present, with passive systems exempt. Oscillation is now a required supervisory signal and annunciator point.
- Lightning and surge (18.4). Rewritten around NFPA 70 Article 750, with lead-in protector listing updated and grounding rules added for cabling between buildings.
- Coax backbone termination (18.12.3.7). A coax backbone ends in a coupler plus an RF termination, and extensions require an isolating passive divider.
- Documentation. NFPA 170 symbols, records kept on site, and documented frequency changes.
- Hardware. Enclosure and battery enclosure ratings, donor isolation measured at the booster’s DAS port, and labeling of the circuit disconnect.
When Does NFPA 1225-2027 Apply in California?
Publication of a new NFPA standard does not automatically make that edition enforceable statewide in California, but the date it starts to matter on your project is earlier than the statewide calendar indicates.
California is currently operating under the 2025 California Building Standards Code, effective January 1, 2026, through December 31, 2028. California is now beginning its 2027 Triennial Code Adoption Cycle. That process will produce the 2028 California Building Standards Code, which the California Building Standards Commission says will be published on July 1, 2028, and become effective on January 1, 2029. The Office of the State Fire Marshal is participating in that process, with Building, Fire, and Other workgroup language due February 1, 2027.
NFPA 1225-2027 should therefore be considered a candidate for incorporation into California’s next statewide code cycle. Its statewide adoption, including any California amendments, has not yet been finalized, and January 1, 2029, is the earliest likely date for the new edition to become part of the next regular statewide code through that process.
Two factors can bring it sooner. Many AHJs publish ERCES criteria documents or local amendments that reference the current edition of NFPA 1225 rather than a fixed year, so a new edition can apply as soon as it is published. California’s intervening code adoption cycle can also produce supplements between triennial editions. Design teams working now on buildings that will be occupied at the end of the decade should design with the 2027 provisions in view, not wait for an adoption date.
Local requirements always matter. An AHJ may have amendments, policies, or system criteria that affect an ERCES project, so the applicable requirements should be confirmed for the jurisdiction and the project.
More to Come
Each of these changes deserves more than a paragraph. Over the next few months, IBWS will take a deeper look at the major NFPA 1225-2027 ERCES changes, including the code language, how it differs from the 2022 edition, and what each change means for design, installation, commissioning, and testing.
We will begin with the near-far requirement, because it illustrates the theme running through the whole edition. A system has to perform under the conditions responders create, not the conditions a test procedure finds convenient.
Sources
- NFPA 1225, 2022 Edition, Chapter 18 and associated Annex A material.
- NFPA 1225, 2027 Edition, Chapter 18, Chapter 20 and associated Annex A material.
- California Building Standards Commission, 2025 California Building Standards Code and 2027 Triennial Code Adoption Cycle information.
- California Office of the State Fire Marshal, 2027 Triennial Code Development Cycle work-group information.
About IBWS
In-Building Wireless Solutions (IBWS) provides ERCES and Cellular DAS design, testing, installation support and commissioning. IBWS helps project teams determine what is actually required and develop systems around the RF conditions of the building.
If you have a project in design or approaching acceptance, we are glad to take a look.