1205.6 Indoor Installations
Rooms containing stationary fuel cell power systems shall be separated from the following occupancies by fire barriers or horizontal assemblies, or both, constructed in accordance with the California Building Code.
- Group B, F, M, S and U occupancies by 1-hour fire-resistance-rated construction.
- Group A, E, I and R occupancies by 2-hour fire-resistance-rated construction.
Exception: Stationary fuel cell power systems with an aggregate rating less than 50 kW shall not be required to be separated from other occupancies provided that the systems comply with Section 9.3 of NFPA 853.