UL 1685

Abstract

The UL flame exposure is a vertical-tray fire test for determining values of cable damage height and smoke release from electrical and optical-fiber cables when the cables are subjected to a flaming ignition source. For a cable to be acceptable under the UL test procedure, each of the following is to be exhibited (see 10.1 and 10.2): <br>a) The cable char height is to be less than 8 ft, 0 inch (244 cm) when measured from the bottom of the cable tray in accordance with Section 8. <br>b) The total smoke released is to be 95 m² or less. <br>c) The peak smoke release rate is to be 0.25 m²/s or less. <br>The purpose of this test is to determine flame propagation and smoke characteristics of these cables to qualify the cables for the limited smoke marking. <br>This test does not investigate the toxicity of the products of combustion or decomposition. <br>This test does not cover the constructional requirements for the cable or any electrical, optical, or other performance requirements for the cable.