2010 ADA Standards for Accessible Design

TECHNICAL CHAPTER 7: COMMUNICATION ELEMENTS AND FEATURES 704.4 TTYs. TTYs required at a public pay telephone shall be permanently affixed within, or adjacent to, the telephone enclosure. Where an acoustic coupler is used, the telephone cord shall be sufficiently long to allow connection of the TTY and the telephone receiver. Advisory 704.4 TTYs. Ensure that sufficient electrical service is available where TTYs are to be installed. 704.4.1 Height. When in use, the touch surface of TTY keypads shall be 34 inches (865 mm) minimum above the finish floor. EXCEPTION: Where seats are provided, TTYs shall not be required to comply with 704.4.1. Advisory 704.4.1 Height. A telephone with a TTY installed underneath cannot also be a wheelchair accessible telephone because the required 34 inches (865 mm) minimum keypad height can causes the highest operable part of the telephone, usually the coin slot, to exceed the maximum permitted side and forward reach ranges. (See Section 308). Advisory 704.4.1 Height Exception. While seats are not required at TTYs, reading and typing at a TTY is more suited to sitting than standing. Facilities that often provide seats at TTY’s include, but are not limited to, airports and other passenger terminals or stations, courts, art galleries, and convention centers. 704.5 TTY Shelf. Public pay telephones required to accommodate portable TTYs shall be equipped with a shelf and an electrical outlet within or adjacent to the telephone enclosure. The telephone handset shall be capable of being placed flush on the surface of the shelf. The shelf shall be capable of accommodating a TTY and shall have 6 inches (150 mm) minimum vertical clearance above the area where the TTY is to be placed. 705 Detectable Warnings 705.1 General. Detectable warnings shall consist of a surface of truncated domes and shall comply with 705. 705.1.1 Dome Size. Truncated domes in a detectable warning surface shall have a base diameter of 0.9 inch (23 mm) minimum and 1.4 inches (36 mm) maximum, a top diameter of 50 percent of the base diameter minimum to 65 percent of the base diameter maximum, and a height of 0.2 inch (5.1 mm). 705.1.2 Dome Spacing. Truncated domes in a detectable warning surface shall have a center-to- center spacing of 1.6 inches (41 mm) minimum and 2.4 inches (61 mm) maximum, and a base-to- base spacing of 0.65 inch (17 mm) minimum, measured between the most adjacent domes on a square grid. 705.1.3 Contrast. Detectable warning surfaces shall contrast visually with adjacent walking surfaces either light-on-dark, or dark-on-light. 196 - 2010 Standards: Titles II and III Department of Jus2ti3c3e Titles II and III - 2010 Standards - 167