Rail transit power cable

The cable has the characteristics of low smoke, no halogen, flame retardant, etc., at the same time, considering the waterproof, anti Japanese, anti UV, anti rat, etc.. Cable waterproof, moisture resistance performance: 72 hours of water immersion, remove the outer protective layer, with the naked eye, the surface of the insulating layer is dry. The flame retardant performance of the cable is met with the vertical burning test of the GB18380-2008 cable. When the cable is burning, the low smoke performance meets the test conditions specified in the GB/T17651, and the minimum transmission rate of the smoke concentration is not less than 80%. The pH value and the electric conductivity of the escaping gas are tested according to GB/T17650.2, the pH value is not less than 4.3, the electric conductivity is no more than 10μ s/mm. The halogen acid gas emitted by the IEC60764 (1994) is not more than 2.0mg/g. The DC resistance of the copper conductor 20 is in accordance with the requirements of GB/T3956. The insulation resistance of the cable meets the provisions of 3.67M&Omega, the insulation resistance constant Ki is not less than GB/T12706;.Km. Branch joint insulation resistance is not less than 200MΩ. The branch joint thermal cycling test according to testing conditions JG/T147-2002, JB/T10636-2006 the provisions of the, meet the 500 cycles of thermal cycle test: 25th thermal cycling tests at the end, the temperature rise no more than 75 DEG C. Twenty-fifth to 125 cycles of thermal cycling, no more than twenty-fifth cycles of temperature rise at the end of 126th, 8 to 500 cycles, no more than 125th times the temperature rise at the end of the 8. The fire resistance performance of the fire resistance cable can be maintained under the condition of 900 GB/T19216, and the cable can be maintained for 90 minutes at degrees.