240-Minute Fire Resistance: Why NSW Just Rewrote Battery Safety Rules for Data Centers
Fire and Rescue NSW has issued a position statement that could reshape how data centers are built across Australia — and potentially influence fire safety standards worldwide. The state fire agency is now requiring lithium-ion battery storage rooms in data centers to achieve a 240/240/240 fire resistance level, meaning walls, floors, and ceilings must maintain structural adequacy, integrity, and insulation for a full four hours during a fire event.
This lithium-ion battery fire safety standard marks one of the most stringent regulatory requirements for enclosed BESS installations anywhere in the world. It arrives at a pivotal moment for New South Wales, where 15 data center projects worth AU$51.9 billion have been endorsed for prioritised approvals, and data center electricity consumption is projected to reach 12% of National Electricity Market demand by 2030.
Why Existing Fire Testing Falls Short
The technical basis for FRNSW's requirement exposes a critical gap in current testing frameworks. The agency explicitly states that UL 9540A — the most commonly referenced standard for battery fire safety testing — does not, in isolation, represent a credible fire scenario for batteries installed within enclosed rooms. The problem is environmental: most large-scale fire testing has been conducted in open-air conditions, where heat dissipates freely into the atmosphere.
Inside a compartment, the physics change dramatically. Radiative heat feedback from hot gas layers and surrounding surfaces can accelerate fire growth well beyond what open-air tests predict. As FRNSW bluntly states, "the performance of fire-resisting construction exposed to lithium-ion battery fires is relatively unknown," because temperatures generated may exceed those anticipated under Australian Standard AS1530.4, the benchmark for rating construction materials. Visit our store for LiFePO4 battery solutions designed with inherently safer chemistry that reduces thermal runaway risk.
Sprinkler Systems: Validated Performance Required
For sprinkler systems protecting rooms containing lithium-ion batteries, FRNSW has aligned with NFPA 855:2026, the US National Fire Protection Association's standard for stationary energy storage systems. The requirement is unambiguous: for any ESS group exceeding 50kWh — a threshold that encompasses virtually all data center UPS battery installations — the sprinkler system design must be validated by representative large-scale fire test data.
Where such testing data is not available, international standards and guidelines specific to the battery chemistry, capacity, configuration, and installation arrangement must inform sprinkler design criteria. This moves the industry from a "one size fits all" approach to sprinkler protection toward chemistry-specific, configuration-aware fire suppression engineering — a more sophisticated but also more demanding regulatory posture.
Diesel Generators Under the Same Microscope
FRNSW's position statement doesn't stop at batteries. The agency is also reclassifying how multi-storey diesel generator and fuel tank structures are regulated. Historically classified as Class 10 structures — the category for non-habitable buildings like garages and sheds — these auxiliary data center buildings will now likely require Class 8 classification, the standard for factories and industrial processes, with corresponding fire-resistant construction, separation, active suppression, and firefighter intervention provisions.
This reclassification matters because diesel generator backup systems are still standard in data center design. As the industry increasingly incorporates lithium-ion BESS alongside traditional diesel backup, the combined fire load of both systems in proximity creates risk profiles that existing building codes were never designed to address.
What This Means for the Global Data Center Industry
FRNSW's position statement is a regulatory document from one Australian state, but its implications could ripple globally. The agency's critique of UL 9540A's limitations in enclosed compartments is not unique to Australia — it's a physics problem that applies everywhere batteries are installed indoors. Data center operators in Singapore, the US, Europe, and other major markets should anticipate similar scrutiny as fire authorities worldwide reassess their approach to BESS installations.
For the energy storage industry, FRNSW's intervention carries both challenge and opportunity. The challenge is clear: more stringent fire resistance requirements mean higher construction costs and longer approval timelines. But the opportunity is equally significant — manufacturers who can demonstrate superior fire safety performance, through chemistry choices like LiFePO4 that offer intrinsically lower thermal runaway risk, and through system designs validated by compartment-scale fire testing, will gain a decisive competitive advantage in the data center market. The era of assuming lithium-ion batteries are safe simply because they passed open-air UL 9540A testing is over. Explore our collection of fire-safe LiFePO4 energy storage products designed for mission-critical applications.
