Distance requirements between energy storage containers
NFPA 855--the second edition (2023) of the Standard for the Installation of Stationary Energy Storage Systems--provides mandatory requirements for, and explanations of, the safety
Individual energy storage system units shall be separated from each other by at least 3 feet (914 mm). The energy storage system shall be separated from doors, windows, operable openings into buildings, or HVAC inlets by at least 5 feet (1524 mm)
The energy storage system shall comply with applicable requirements in Section 1206.15. The energy storage system shall be installed in accordance with the manufacturer's instructions and their listing. Individual energy storage system units shall be separated from each other by at least 3 feet (914 mm).
Rooms and other indoor areas containing energy storage systems shall be separated from other areas of the building in accordance with Section 1206.14.4 and Chapter 7 of this code. Energy storage systems shall be permitted to be in the same room as the equipment they support. 1206.11.4 Seismic and structural design.
Energy storage systems shall be permitted to be installed outdoors on exterior walls of buildings when all of the following conditions are met: The maximum energy capacity of individual energy storage system units shall not exceed 20 kWh. The energy storage system shall comply with applicable requirements in Section 1206.15.
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