Experimental testing and evaluation of coating on cables in container fi re test facility
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Fire tests were conducted on cables using fire-retardant paint employed in nuclear power plants thattransmit electrical power, control and instrument signals. The failure criteria of various power andcontrol cables coated with fire retardant coating at three different coating thicknesses (~0.5 mm, 1.0 mm& 1.5 mm) were studied under direct flame test using Container Fire Test Facility (CFTF) based onstandard tests for bare cables. A direct flame fire test was conducted for 10 min with an LPG ribbonburner rated at ten by fixing the cable samples in a vertical cable track. Inner sheath temperature wasmeasured until ambient conditions were achieved by natural convection. The cables are visually evaluated for damage and the mass loss percentage. Cable functionality is ascertained by checking forelectrical continuity for each sample. The thickness of cable coating on fire exposure is also studied bycomparing the transient variation of inner sheath temperature along the Cable length. This study alsoevaluated the adequacy of fire-retardant coating on cables used for safety-critical equipment in nuclearpower plants
Abstract
Fire tests were conducted on cables using fire-retardant paint employed in nuclear power plants thattransmit electrical power, control and instrument signals. The failure criteria of various power andcontrol cables coated with fire retardant coating at three different coating thicknesses (~0.5 mm, 1.0 mm& 1.5 mm) were studied under direct flame test using Container Fire Test Facility (CFTF) based onstandard tests for bare cables. A direct flame fire test was conducted for 10 min with an LPG ribbonburner rated at ten by fixing the cable samples in a vertical cable track. Inner sheath temperature wasmeasured until ambient conditions were achieved by natural convection. The cables are visually evaluated for damage and the mass loss percentage. Cable functionality is ascertained by checking forelectrical continuity for each sample. The thickness of cable coating on fire exposure is also studied bycomparing the transient variation of inner sheath temperature along the Cable length. This study alsoevaluated the adequacy of fire-retardant coating on cables used for safety-critical equipment in nuclearpower plants
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