What is the meaning of flame retardant control cable ZR,ZA,ZB,ZC respectively? What is the difference?

I. What is the meaning of flame retardant control cable ZR,ZA,ZB,ZC? What is the difference? The main feature of flame retardant control cables is non-combustible, according to GB/T1880.3-2001, GB/T1830.3-2001 "Test Methods for Wires and Cables" can be divided into A, B, C three kinds of flame retardant grade. That is, ZA, ZB, ZC. ZR before the cable model represents flame retardant (not labeled A, B, C level, generally judged to be C level), ZC on behalf of the C level flame retardant. So ZR and ZC are the same meaning. Flame-retardant class A refers to: the cable is installed in the test steel ladder to make the total volume of non-metallic materials contained in the test for 7L/m, the fire time of 40 minutes, the cable combustion stops, drying specimens, measured test **** large charring range shall not be higher than the bottom of the blowtorch 2.5 m. Flame-retardant class B refers to: the cable is installed in the test steel ladder to make the total volume of non-metallic materials contained in the test of 3.5L/m, the fire time of 40 minutes, after the cable combustion stops, the cable combustion stops, dry specimen, test **** large charring range shall not be higher than the bottom of the torch. Flame-retardant category B means: the cable is installed on the test steel ladder so that the total volume of non-metallic materials contained in the test is 3.5L/m, the fire time is 20 minutes, after the cable stops burning, dry the specimen, the measured test **** large charring range shall not be higher than the bottom of the blowtorch 2.5m. m.

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