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1 Implementation standard

GB/T 12706.1-2020 Rated voltage 1kV (Um=1.2kV) to 35kV (Um=40.5kV) extruded insulation power cables and accessories Part 1 Rated voltage 1kV (Um=1.2kV) and 3kV (Um=3.6kV) cables

GB/T 19666-2019 Flame-retardant and fire-resistant wire and cable general design and manufacture.

2 Use

This product is suitable for 1kV and below power transmission and distribution systems for transmission and distribution of energy.

Widely used in electric power, construction, industrial and mining, metallurgy, petrochemical, transportation and other sectors, has completely replaced the oil-impregnated paper insulated power cable and partly replaced the PVC insulated power cable.

3 Model and name

Table 1 Cable models and names

Note: Halogen-free low-smoke, flame retardant, fire-resistant series products are characterized by the prefix code WD, ZA, ZB, ZC, respectively

4 Use characteristics

4.1 The rated voltage U0/U is 0.6/1kV.

4.2 The maximum allowable long-term working temperature of the conductor is 90℃, and the maximum temperature of the cable conductor does not exceed 250℃ when short-circuiting (the longest duration does not exceed 5s).

4.3 Conductor DC resistance in line with the provisions of GB/T 3956-2008.

4.4 The ambient temperature at the time of laying is not lower than 0℃, and should be preheated when it is lower than 0℃.

4.5 The minimum bending radius of three-core unarmored is not less than 15 times the outer diameter of the cable, and that of armored is not less than 12 times the outer diameter of the cable.

4.6 Cable laying is not limited by the horizontal drop.

4.7 Frequency voltage test.

The cables are subjected to 3.5kV/5min voltage test without breakdown.

4.8 Flame-retardant characteristics.

Flame-retardant cable can withstand the GB/T 19666-2019 bundle burning test.

Halogen-free low smoke flame retardant cable can withstand the GB/T 19666-20195 bundle combustion test, the minimum light transmission rate ≥ 60%, conductivity weighted value ≤ 10μs/mm.

Flame-resistant cable can withstand the bundle combustion test specified in GB/T 19666-2019, the supply fire temperature is 750℃, the supply fire + cooling time is 90+15min, the 2A fuse does not stop under rated voltage, and the indicator does not go out.