California Code, Health and Safety Code - HSC § 13196.5

(a) Except as provided in subdivisions (b), (c), and (d), no person shall engage in the business of servicing or testing automatic fire extinguishing systems without a license issued by the State Fire Marshal pursuant to this chapter.

(b) Persons who engage in the business of servicing or testing fire alarm devices, water flow alarm devices, or the supervisory signaling components of automatic fire extinguishing systems shall not be subject to the licensing requirements contained in this chapter.

(c) Industrial systems may be serviced or tested by, or under the supervision of, an engineer employed by a private entity who shall not be subject to the licensing requirements contained in this chapter unless he or she performs the service or testing for a fee outside of the employment relationship.

(d) Any specialty contractor, as defined in subdivision (b) of Section 7058 of the Business and Professions Code, shall not be subject to the licensing requirements contained in this chapter.