UL 1685:2015 free download

UL 1685:2015 free download Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables
1 Choice of Test
1 .1 Limits are specified for each fire test to make the tests equally acceptable for the purpose of quantifying the smoke. The cable manufacturer is to specify, for testing each limited-smoke cable construction, either the UL vertical-tray flame exposure described in Sections 4 – 1 1 or the FT4/IEEE 1 202 type of flame exposure described in Sections 1 2 – 1 9. The same test need not be specified for all constructions. Sections 20 – 25 provide for the collection of certain optional additional data, which may be requested by the cable manufacturer (see list in 25.1 ).
1 .2 For cables that are subject to a vertical-tray flame test without the cable manufacturer requesting the rating for limited smoke, the end-product wire Standard specifies that smoke measurements are not applicable. In the UL or FT4/IEEE 1 202 test for these cables, only the flame height and cable damage height are of interest unless the manufacturer requests that the smoke data and results also be reported.
2 Units of Measurement
2.1 If a value for measurement is followed by a value in other units either in parentheses or in square brackets [ ], the second value may be only approximate. The first-stated value is the requirement.
3 Undated References
3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. UL FLAME EXPOSURE
4 Scope
4.1 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 1 0.1 and 1 0.2):
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.
b) The total smoke released is to be 95 m 2 or less.
c) The peak smoke release rate is to be 0.25 m 2 /s or less.
4.2 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.
4.3 This test does not investigate the toxicity of the products of combustion or decomposition.
4.4 This test does not cover the constructional requirements for the cable or any electrical, optical, or other performance requirements for the cable.
5 Apparatus
5.1 General
5.1 .1 The test apparatus is to include the following main components:
a) Ignition source.
b) Collection hood and exhaust duct.
c) Velocity-measuring instrumentation.
d) Smoke-measuring instruments.
e) Data-acquisition system.
5.1 .2 The cable test enclosure is to be located in a test building that has vents for the discharge of the combustion products and also has provisions for fresh-air intake.