The State Fire Marshal shall adopt regulations to require a public address system with an emergency backup power system for all buildings or structures constructed on or after July 1, 1991, which are intended for public assemblies of 10,000 or more persons.
The State Fire Marshal shall adopt regulations to require any existing building or structure intended for public assemblies of 10,000 or more persons which, on or after January 1, 1991, has or subsequently installs a public address system, to have an emergency backup power system for the public address system.
Source:
Section 13108.9, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=13108.9..