2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-409.4.6 Car controls.
Elevator car control buttons shall comply with Sections 11B-409.4.6, 11B-309.3, 11B-309.4, and shall be raised or flush.
11B-409.4.6.1 Size.
Control buttons shall be ¾ inch (19.1 mm) minimum in their smallest dimension.
11B-409.4.6.2 Location.
Control panels shall be on a side wall, 12 inches (305 mm) minimum from any adjacent wall.
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