ZR-KVVP, ZR-KYJVP flame retardant control cable
Executive standard
GB/T 9330-2008 plastic insulated control cable
General rules for GB/T19666-2005 flame retardant and fire resistant wire and cable
purpose
Plastic insulated (PVC insulated and XLPE insulated) sheath control cables are used for occasions such as AC rated voltage 0.6/1kV, 450/750V control, monitoring circuit and protection circuit, etc., for power distribution and control of power plants and substations in power plants and substations, and for use in flame retardant requirements.
Name of other flame retardant cables

Note: flame retardant (ZR) is divided into bundles A, B, C flame retardant, respectively, ZA, ZB and ZC, generally do not specify (ZR) level is C class, plus WDZ for low smoke halogen free cable.

The rated voltage is U0/U 450/750V.
The long term allowable working temperature of PVC insulated conductor is 70 C; the long-term allowable working temperature of XLPE insulated conductor is 90 C;
The laying temperature of the cable should not be less than 0 degrees. The recommended allowable bending radius is:
The cable without armored layer should not be less than 6 times of the outer diameter of the cable.
The cable with armored or copper shielded structure shall be not less than 12 times the outer diameter of the cable.
The soft cable with shielding structure should be not less than 6 times the cable.
By color recognition, the insulation cores of 5 core and below cables are colored or digital.
By digital recognition, from the inner layer to the outer layer, it starts clockwise in the order of natural numbers starting from 1, and the color of the digital logo should be obviously different from the insulation color.
Main technical specifications of cables
1. When the conductor is 20 degrees, the large DC resistance is shown in Table 3.
Table 3 large DC resistance / Omega /km at 20 degree conductor

2. AC withstand voltage test for power frequency is shown in Table 4.
Table 4 voltage test

3. Insulation resistance at working temperature is shown in Table 5.
Table 5 insulation resistance at a permissible operating temperature

4, flame retardancy
The flame-retardant properties should be tested by A, B or C in the prescribed burning of GB/T18380.33 ~ 35. If the user fails to make a request, according to the requirements of the C test, it will meet the requirements specified in Table 6.
Table 6 requirements for bunched combustion