ASTM D 5424

1.1 This is a fire-test-response standard. 1.2 This test method provides a means to measure the smoke obscuration resulting from burning electrical insulating materials contained in electrical or optical fiber cables when the cable specimens, excluding accessories, are subjected to a specified flaming ignition source and burn freely under well ventilated conditions. 1.3 This test method provides two different protocols for exposing the materials, when made into cable specimens, to an ignition source (approximately 20 kW), for a 20 min test duration. Use it to determine the flame propagation and smoke release characteristics of the materials contained in single and multiconductor electrical or optical fiber cables designed for use in cable trays. 1.4 This test method does not provide information on the fire performance of electrical or optical fiber cables in fire conditions other than the ones specifically used in this test method nor does it measure the contribution of the cables to a developing fire condition. 1.5 Data describing the burning behavior from ignition to the end of the test are obtained. 1.6 The production of light obscuring smoke is measured. 1.7 The burning behavior is documented visually, by photographic or video recordings, or both. 1.8 The test equipment is suitable for making other, optional, measurements, including the rate of heat release of the burning specimen, by an oxygen consumption technique and weight loss. 1.9 Another set of optional measurements are the concentrations of certain toxic gas species in the combustion gases. 1.10 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. (See ) 1.11 This standard measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment ....(abbreviated)