Cal. EDC § 32001

Every public, private, or parochial school building having an occupant capacity of 50 or more pupils or students or more than one classroom shall be provided with a dependable and operative fire alarm system. Every person and public officer managing, controlling, or in charge of any public, private, or parochial school shall cause the fire alarm signal to be sounded upon the discovery of fire, unless the school is equipped with an automatic fire detection, and alarm system, which may include, but for the purposes of this section is not required to include, a sprinkler system, as described in Section 17074.52. Every person and public officer managing, controlling, or in charge of any public, private, or parochial school, other than a two-year community college, shall cause the fire alarm signal to be sounded not less than once every calendar month and shall conduct a fire drill at least once every calendar month at the elementary level and at least four times every school year at the intermediate levels.

A fire drill shall be held at the secondary level not less than twice every school year.