The National Fire Protection Association publication 72, "The National Fire Alarm Code", is the basis for most fire codes in the United States. The latest edition, published in 2006, will have updated requirements for both sound pressure level and intelligibility relating to messages used for emergency communications. This presentation will describe the changes between the new edition and the previous version, published in 2002, as well as a summary of proposed changes that were not accepted. A case study will show the impact of these requirements on the design of sound system designs for a series of light rail stations in Seattle, Washington, and contrast them with subway stations in Boston, Massachusetts.
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