Page | 034 Similar requirements for hazard mitigation analysis are required by NFPA 855 §4.1.4 as a basis for increasing maximum stored energy (600 kWh for lithium-ion batteries), though items 4 and 5 above are not required.
Per FCNYS §1206.5.2, the fire code official shall be permitted to approve the hazardous mitigation analysis as documentation of the safety of the ESS installation provided the consequences of the analysis demonstrate the following:
1. Fires will be contained within unoccupied ESS rooms or areas for the minimum duration of the fire-resistance rated separations identified in Section 1206.14.4.
2. Fires in occupied work centers will be detected in time to allow occupants within the room or area to safely evacuate.
3. Toxic and highly toxic gases released during fires will not reach concentrations in excess of IDLH level in the building or adjacent means of egress routes during the time deemed necessary to evacuate occupants from any affected area.
4. Flammable gases released from ESS during charging, discharging and normal operation will not exceed 25 percent of their lower flammability limit (LFL).
5. Flammable gases released from ESS during fire, overcharging and other abnormal conditions will be controlled through the use of ventilation of the gases preventing accumulation or by deflagration venting.
The following key codes, standards, and local requirements are referenced throughout the report:
2020 Fire Code of New York State §1206 Electrical Energy Storage Systems
2021 International Fire Code §1207 Electrical Energy Storage Systems
NFPA 855 Standard for the Installation of Stationary Energy Storage Systems, 2020 Edition
NFPA 855 TIA 20-2 (includes revisions for §4.12 Explosion Control and Annexes A.4.12 and A.4.12.1, effective September 15, 2021)
UL 9540A Standard for Test Method for Evaluation Thermal Runaway Fire Propagation in Battery Energy Storage Systems, 4th Edition
UL 9540 Standard for Energy Storage Systems and Equipment, 2nd Edition
NFPA 68 Standard on Explosion Protection by Deflagration Venting, 2018 Edition
NFPA 72 National Fire Alarm and Signaling Code, 2019 Edition
NORTH BEDFORD ROAD BESS – MOUNT KISCO, NY | Hazard Mitigation Analysis 6
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