2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-411.1.2 Car designations.
Elevator cars shall be designated with a single alphabetic character. For elevators programmed to the same hall call console or group of hall call consoles, each elevator car shall be designated with a different single alphabetic character.
Exception: Elevator systems with more than 26 elevators shall be permitted to use alpha-numeric designations such as “A1”.
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