ERCES Authority · Educational Reference

NFPA 1225 Replaces NFPA 1221 — What Changed for ERCES Designers

Zion Fire Protection | ercesauthority.com | Updated June 2026

If you have been designing or specifying ERCES systems for more than a few years, you learned the rules from NFPA 1221, Standard for the Installation, Maintenance, and Use of Emergency Services Communications Systems. That standard is no longer being updated. NFPA 1225, Standard for Emergency Services Communications Systems, replaced it in 2022, consolidating NFPA 1221 and NFPA 1061 (Standard for Professional Qualifications for Public Safety Telecommunications Personnel) into a single unified document.

This article focuses on what changed for in-building ERCES design and testing — written for designers, low-voltage contractors, and AHJ plan reviewers who need to understand the technical delta.

Why NFPA Created 1225

NFPA 1221 governed public-safety communications infrastructure, including in-building ERCES through Chapter 9. NFPA 1061 governed personnel competencies for communications personnel. As ERCES became mainstream and technically complex, overlap between the two created redundancy and occasional conflict.

NFPA 1225 (2022 edition, first edition) was developed to consolidate both, bring in-building ERCES requirements into a dedicated chapter with updated technical requirements, and align the standard with the IFC. NFPA 1225 absorbed NFPA 1221 Chapter 9 wholesale, then expanded it into the new Chapter 18.

Critical note on IFC edition alignment: The 2021 IFC still references NFPA 1221 (not NFPA 1225) in §510.4.2. Only the 2024 IFC references NFPA 1225 (2022 edition). A jurisdiction operating under IFC 2021 or earlier is technically under NFPA 1221 as the design standard — unless the AHJ has independently adopted NFPA 1225. Always confirm which edition your AHJ enforces, and stamp plans accordingly. Where a jurisdiction has adopted IFC 2021, the referenced standard remains NFPA 1221 — confirm before starting design.

Chapter 18 — The In-Building ERCES Chapter

Chapter 18 of NFPA 1225 is titled "In-Building Emergency Responder Communication Enhancement Systems." This chapter consolidates and extends the in-building ERCES content that was previously in NFPA 1221 Chapter 9 and supplemented by local amendments. The major technical requirements follow.

DAQ Levels — Clarified and Codified

The Delivered Audio Quality (DAQ) scale existed in NFPA 1221 and carries forward into NFPA 1225 Chapter 18 with the same required thresholds. NFPA 1225 §18.9 codifies:

The required minimum DAQ is 3.0, not 3.4. The NFPA 1225 Annex (A.18.9.1) states: "Although DAQ 3.0 is required as a minimum, it is recommended that systems be designed for DAQ 3.4 to provide a safety factor." Design to 3.4 is best practice; enforce only 3.0 as the pass/fail threshold.

Signal strength is measured using a minimum received signal of −95 dBm (per IFC §510.4.1 and referenced in Safer Buildings Coalition NFPA 1225 summary §24.5.2.3). This quantitative metric supplements the DAQ assessment and is what propagation design tools like iBwave calculate against.

The 99% threshold for critical areas is preserved from NFPA 1221. Some designers had applied 95% across all areas under NFPA 1221 — the explicit 99% requirement for critical areas in NFPA 1225 §18.8.3 makes that interpretation no longer viable.

Battery Survivability — Extended and Tested

NFPA 1225 §18.13.2 requires:

• Minimum 12-hour standby capacity at full system load (consistent with IFC §510.4.2.3). An alternative of a 2-hour standby battery plus facility generator connection is permitted where the generator can sustain 12 hours of full system operation.
• The battery test must be a discharge test under load, not a voltage check or capacity calculation. The system must sustain all active components — BDA, monitoring circuits, and annunciation — for the full duration.
• Batteries must be replaced on the manufacturer's defined schedule regardless of apparent condition. A battery holding voltage at rest may fail under load.
• Low-battery supervisory signal is required when 70% of the 12-hour operating capacity has been depleted (NFPA 1225 §18.14.1.2(2)(c)).

A voltmeter check of a sealed lead-acid battery is not an acceptable annual test under NFPA 1225.

Monitoring — Aligned with NFPA 72

NFPA 1225 §18.14 requires the ERCES monitoring interface to comply with NFPA 72, National Fire Alarm and Signaling Code, specifically Chapter 10. Required supervisory signals include:

• Signal source (donor) malfunction
• Active RF-emitting device failure
• Low-battery capacity (to 70% depletion)
• Active system component failure
• Loss of normal AC power
• Failure of battery charger
• Oscillation detection (§18.3.2.1)

A dedicated annunciator is required within the fire command center (where a fire command center exists) to display the status of all RF-emitting devices and active system components (NFPA 1225 §18.14.2).

Under NFPA 1221, some designers treated ERCES monitoring as optional or used a non-fire-alarm pathway. NFPA 1225 removes that ambiguity.

BDA Type Terminology

NFPA 1225 Chapter 18 references both FCC BDA classes using its own terminology: "type A signal boosters (i.e., channelized)" and "type B signal boosters (i.e., broadband)." These correspond to the FCC 47 CFR §90.219 definitions of Class A (passband ≤ 75 kHz per channel) and Class B (passband > 75 kHz). Type B BDAs must be registered with the FCC before use because of their greater potential for interference. The AHJ and frequency license holder typically specify which type is required.

Grid-Test Methodology — Structured and Documented

NFPA 1221 did not prescribe a specific test grid methodology, producing inconsistency in acceptance testing documentation across jurisdictions. NFPA 1225 Chapter 18 requires:

• Test locations distributed across each floor at a defined density — typically a minimum grid dimension of 20 ft and a maximum of 80 ft (NFPA 1225 Chapter 18 Annex guidance).
• Testing performed with a portable radio in talk-back mode, not passive signal measurement alone.
• Results logged by GPS coordinates or a dimensioned floor plan showing exact test point locations.
• Coverage percentages derived from the documented grid, not estimated.

Acceptance testing deliverables now require a test report that maps every measurement point, its result, and the resulting pass/fail percentage for each floor and critical area.

Designer Comparison Table

Transition and Adoption

NFPA 1225 was issued as its first edition in 2022. The 2021 IFC still references NFPA 1221; the 2024 IFC references NFPA 1225. As of this writing, many Texas jurisdictions have adopted IFC 2021, which means NFPA 1221 remains the technically-referenced standard in most of Texas — though some jurisdictions have independently adopted NFPA 1225.

The practical approach: design to NFPA 1225 Chapter 18 even if the adopted code still references NFPA 1221. The signal coverage thresholds, pathway survivability levels, and equipment certification requirements are substantially the same, AHJs are increasingly familiar with Chapter 18, and designing to the current standard reduces the risk of rejection at acceptance testing or future re-inspection cycles. Stamp plans referencing whichever standard the AHJ enforces.

Use our free Building Signal Check tool to see if your building is in scope: https://bda.zion.us/bda/check

This article is provided as educational reference. It does not constitute a code interpretation or legal opinion. Confirm current code adoption and amendments with your local Authority Having Jurisdiction (AHJ) before applying any of this to a specific building.

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