The scope of this document covers the fire safety aspects of lithium-ion (Li-ion) batteries and Energy Storage Systems (ESS) in industrial and commercial applications with the primary focus on active fire protection.
Fire safety systems in energy storage require integration between Battery Management Systems (BMS), Combustible Gas Detection systems, Smoke and Temperature Sensors, and other related systems to be effective during an incident.
Core requirements include rack separation limits, a Hazard Mitigation Analysis to prevent thermal-runaway cascades, early-acting fire suppression and gas detection, stored-energy caps for occupied buildings, and detailed safety documentation (UL).
NFPA 855 establishes comprehensive, technology-neutral criteria for the safe installation of energy storage systems. Its primary goal is to mitigate fire and explosion hazards, such as thermal runaway, toxic gas release, and electrical faults.
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This includes surge protection devices (SPDs), effective grounding systems, isolation and shielding of sensitive components, and real-time lightning monitoring systems.
The 2026 edition of NFPA 855 introduces mandatory hazard analyses, expanded battery chemistry coverage, and annual emergency planning requirements for stationary energy storage systems.
Each rating, such as IP54, IP65, or IP68, indicates a specific level of protection that determines where the energy storage system (ESS) can safely operate. At the basic level, IP20 offers minimal protection.
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