ADAAG Manual

Emergency Communications [4.10.14]

Emergency two-way communication devices, where provided, must meet the ASME A17.1‒1990 standard. In order to accommodate people with hearing or speech impairments, ADAAG also specifies that the system not rely solely on voice communication. A voice intercommunication system is not required by ADAAG. An audio system with a visual display can provide information on the status of a rescue. Clearly labeled visual displays can be as simple as lighted jewels that indicate that the call for help has been activated and that this message has been received. Voice intercommunication or other audible systems will provide access for people with vision impairments. The highest operable portion of the communication device must be no higher than 48 inches and no lower than 15 inches. Recommendation: Devices that do not require handsets are easier to use by people who have a limited reach. Also, handset compartments with small handles are difficult to open by people who have difficulty grasping.

Emergency communication devices must be identified by a raised symbol with lettering that must be readable (i.e., complies with specifications for character proportion [4.30.2] and height [4.30.3] and contrast [4.30.5]). The specifications for non-raised characters also apply to instructions for the use of the system.