Energy storage systems located outdoors shall be separated by a minimum 10 feet (3048 mm) from the following exposures:
- Lot lines
- Public ways
- Stored combustible materials
- Hazardous materials
- High-piled storage
- Other exposure hazards
- Clearances from exposures are permitted to be reduced to 3 feet (914 mm) where a 1-hour free standing fire barrier, suitable for exterior use, and extending 5 feet (1.5 m) above and 5 feet (1.5 m) horizontally beyond the physical boundary of the energy storage system installation is provided to protect the exposure.
- Clearances to buildings are permitted to be reduced to 3 feet (914 mm) where noncombustible exterior walls without openings or combustible overhangs are provided on the wall adjacent to the energy storage system and the fire-resistance rating of the exterior wall is no less than 2 hours.
- Clearances to buildings are permitted to be reduced to 3 feet (914.4 mm) where a weatherproof enclosure constructed of noncombustible materials is provided over the energy storage system, and it has been demonstrated that a fire within the enclosure will not ignite combustible materials outside the enclosure based on large scale fire testing complying with Section 1206.6.
- Where exterior wall installations in accordance with Section 1206.15.4 are provided, the clearance between the energy storage system and the wall in which it is mounted, is permitted to be reduced to zero.