NFPA 855
The US standard for the installation of stationary energy storage systems, published by the National Fire Protection Association. Covers siting, spacing, fire suppression, ventilation, and commissioning requirements for BESS installations. Often referenced alongside UL 9540A testing results in fire risk assessments and insurance underwriting.
In energy storage
NFPA 855 requires a Hazard Mitigation Analysis (HMA) for each BESS installation, using UL 9540A thermal-runaway test data to determine siting, spacing (minimum 3 ft between ESS units unless justified by testing), ventilation, and fire suppression requirements. The Authority Having Jurisdiction (AHJ) reviews the HMA during permitting, so early engagement with the local fire marshal is a standard step in US BESS project development.