Mar 25, 2026The 2026 Evolution of UL 9540A and NFPA 855 : Fire Safety Testing for Energy Storage Systems
The energy storage industry is undergoing a major regulatory shift with the publication of the UL 9540A Sixth Edition on March 13, 2026, aligned with the 2026 Edition of NFPA 855. Together, they redefine how thermal runaway fire behavior, especially worst‑case fire propagation hazards, must be tested, interpreted, and applied to engineering design, permitting, and code compliance for Battery Energy Storage Systems (BESS).
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