2013 California Standards for Accessible Design Pocket Guide

11B-407.2.1.1 Height.

Call buttons and keypads shall be located within one of the reach ranges specified in Section 11B-308, measured to the centerline of the highest operable part.

Exception:  Reserved.

[2010 ADAS] EXCEPTION:  Existing call buttons and existing keypads shall be permitted to be located at 54 inches (1370 mm) maximum above the finish floor, measured to the centerline of the highest operable part.