Los Angeles County Municipal Code § 509.1 Fire Code

Where required by the fire code official, gas shutoff valves, electric meters, service switches and other utility equipment, as well as similar equipment of similar privately owned hazards, shall be clearly and legibly marked to identify the unit or space that each serves, and to identify the disconnection means of each, along with the total number of disconnects for each category of hazardous sources (e.g., electrical power sources, natural gas sources, etc.) and further identification of the hazard type where necessary (e.g., lithium-ion ESS, hydrogen gas fuel cell, etc.). Identification shall be made in an approved manner, readily visible and shall be maintained. For the purposes of Sections 509 and 603, both an energy storage system (ESS) and a photovoltaic (PV) system shall each be considered an electrical power source, with electrical service equipment, and an electrical hazard.