How to Check Battery Storage Fire-Protection Requirements: China's 2023 Anti-Accident Rules, Fire Acceptance, NFPA 855 and UL 9540A

Short answer. For a generation-side or grid-side electrochemical storage station in China, the fire text to read first is not a product certificate but section 2.12 of the NEA's 25 Key Requirements (2023), which — for those stations — prescribes siting, battery selection, DC isolation, gas detection, explosion-proof ventilation, alarms and — for new, rebuilt or expanded medium and large lithium-ion stations — a fixed automatic extinguishing system verified by a module-level real-fire test. Around it sit the 2022 and 2025 safety notices (fire acceptance, filing, safety evaluation), the GB/T 42288 safety code, and, for export projects, UL 9540's capacity limits and NFPA 855. This guide lists what each requires and which document proves it. It does not rate any product, agent or vendor.

China: the 2023 requirements, read as four layers

The NEA's 25 Key Requirements for Preventing Power Production Accidents (2023 edition, 9 March 2023) revise the 2014 edition and include section 2.12 on preventing fires at electrochemical storage stations, which the section defines as generation-side and grid-side stations; a station site must not adjoin or be located within premises that produce, store or sell flammable or explosive goods, must not be located in places with dust or corrosive gases, and must not be located in protection zones of important overhead power lines; and battery rooms inside power plants or substations must keep the separation distances in GB 51048. Within that scope, medium and large stations should use mature, high-safety batteries and be cautious with second-life EV batteries (which need consistency screening, traceability-based safety assessment and compliance with GB/T 36276 safety requirements), and lithium-ion battery rooms must not be located in crowded places and must follow GB 51048 layout rules.

Layer 1 — isolation. For those stations the requirements call for DC disconnection devices on storage-unit DC circuits and battery-cluster circuits, structural reverse-polarity protection on module terminals, and a BMS with electrical protections (over/under-voltage, voltage difference, over-current) and non-electrical protections (over-temperature, temperature difference), preferably cluster-level isolation, issuing graded alarms or trip commands for local fault isolation.

Layer 2 — detection and ventilation. For LFP battery rooms of those stations they demand combustible-gas detection that, when H2 or CO exceeds set thresholds, trips room-level and cluster-level DC disconnects and starts emergency ventilation and alarms; ventilation must be explosion-proof, move at least one room volume per minute (net of equipment), be arranged to clear gases of different densities and avoid short-circuiting airflow, and run automatically in normal operation. CNWattHub editorial method: ask whether a vendor's "fire-suppression" offer includes this detection, interlock and ventilation layer or leaves it to another package; the section sets it out (2.12.5) before the extinguishing clause (2.12.7).

Layer 3 — alarm and suppression. For those stations the requirements mandate automatic fire alarm systems in station electrical rooms and, for new, rebuilt or expanded medium and large lithium-ion stations, a fixed automatic extinguishing system in battery rooms that must extinguish open battery fire without re-ignition, with system type, flow, pressure and nozzle layout verified by module-level real-battery fire tests at a qualified institution. Two words carry the weight: "without re-ignition" sets the performance criterion, and "module-level real-battery fire test" sets how it is proven. A suppression agent's generic listing does not satisfy the clause; the test report for the configuration installed does.

Layer 4 — passive protection and operations. For those stations they also require fire-stopping of penetrations and cable entries, protection of openings against rain, snow, sand and small animals, written fire-system operating procedures with annual full testing, a pre-commissioning emergency plan for thermal runaway and fire coordinated with the local fire-rescue authority, regular drills, and that O&M staff pass fire training before taking up duty.

China: the procedural documents

The NEA's 2022 storage safety notice (26 April 2022) requires completion acceptance before commissioning including passing the station's fire acceptance, and requires named fire-safety responsible persons, regular fire inspections and maintenance, and drills for electrolyte leakage, thermal runaway and fire. The April 2025 five-department notice (11 April 2025) adds a safety-condition analysis at feasibility stage with a written report kept on file, inspection of safety facilities after completion or trial run, a post-operation safety evaluation, record-filing of every electrochemical storage project with safety responsibilities named in the filing, fire-rescue authorities writing fire-management and fire-monitoring standards, and the "three simultaneous" rule for safety facilities. The 2021 New-Type Storage Project Management Rules require project parties to follow safety, fire and environmental procedures, and, for second-life EV-battery storage projects, require the batteries of new projects to hold safety assessment reports from qualified bodies and require existing and new projects to run online monitoring platforms, monitor battery parameters in real time, maintain and assess safety regularly and keep emergency plans. On the standards side, GB/T 42288-2022 "Safety code of electrochemical energy storage station" was issued 30 December 2022 and implemented 1 July 2023, and is in force.

Export projects: NFPA 855 and UL 9540A

Outside China the logic is inverted: the installation standard fixes capacity and spacing, and the product test determines how far they may be relaxed. UL 9540 (edition 3) caps individual electrochemical ESS energy at 20 kWh for residential and 50 kWh for non-residential use unless UL 9540A unit-level (residential) or installation-level (non-residential, with marking) results allow more; there is no cap for non-residential systems meeting UL 9540A cell-level criteria or for non-residential systems intended for remote outdoor locations as defined by the installation code provided they are marked per Section 21, which NFPA 855 defines as more than 30.5 m (100 ft) from exposures. UL Solutions states that UL 9540A is the only consensus standard explicitly cited in NFPA 855 for large-scale fire testing and that the 2026 edition of NFPA 855 adds Annex G.11 on large-scale fire testing expectations.

PNNL (October 2023) explains that in a UL 9540A test thermal runaway is deliberately induced to observe cell failure and fire spread through the unit, informing fire-safety design and spacing between units; NFPA 855 covers system design, installation, commissioning, repair/replacement, explosion control and decommissioning, and its zoning-relevant provisions include an emergency response plan (4.3), UL 9540-listed equipment (4.6), fire control and suppression systems (4.9), site/facility construction requirements (9.3–9.5) and explosion control (9.6). At the international level, IEC 62933-5-2:2020 (edition 1.0, 16 April 2020) primarily describes safety aspects for people and, where appropriate, for the surroundings and living beings, for grid-connected energy storage systems with an electrochemical storage subsystem; the IEC page notes a 2025 edition exists.

The comparison worth holding onto: for the stations and projects section 2.12.7 covers, the Chinese route verifies the suppression system by a module-level real-fire test, while the US route verifies propagation behaviour by UL 9540A and lets the result unlock capacity and spacing. A UL 9540A report therefore does not answer the Chinese clause, and a Chinese real-fire verification report does not answer NFPA 855.

Document checklist

Scope limits

GB 51048-2014 and GB/T 42288-2022 full texts were not read; GB 51048 is cited only as referenced by the 2023 requirements. NFPA 855 itself was not retrievable; its contents are described through UL and PNNL. Only the 2020 edition of IEC 62933-5-2 is cited. Section 2.12 applies to generation-side and grid-side stations; user-side storage is outside its stated scope and is not covered here. Provincial fire-acceptance procedures and local fire codes are not covered. No product, agent or vendor is rated.