A vertical riser fire test has been developed to evaluate cables for Classifica tion in accordance with the vertical fire spread requirements of the 1984 National Electrical Code. The test simulates a cable installation in a riser shaft with exposure to a large fire source. A variety of copper conductor cables and op tical fiber cables were tested. Some cables exhibited only minor flame propaga tion and are now Classified by Underwriters Laboratories for use in riser shafts.
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