Standard of Multi-core Overhead Insulated Cable
1. Rated voltage up to and including 1 kv overhead insulated cable GB/T 12527
2. Rated voltage 10 kv overhead insulated cable GB/T 14049
Advantages of Multi-core Overhead Insulated Cable
This product has a weather-resistant, wear-resistant, high mechanical strength, line loss of small features.
Application of Multi-core Overhead Insulated Cable
Mainly used in urban streets and green areas, near the overhead lines of buildings, as well as the power supply security and operation and management requirements of the vast rural areas continue to improve. Particularly suitable for use in densely populated cities, towns and green areas. The use of overhead insulated cables can reduce the spacing and parallel spacing of cable crossings, laying convenient, high flexibility to reduce the occupation of the space corridor, and can greatly reduce the line failure caused by the number of blackouts and electric shock accidents, improve grid security And reliability.
10 kv voltage class insulation structure has two kinds of light ordinary insulation and thin insulation,, light and thin insulation adapted to the trunk and the surrounding environment is not frequent contact without a lot of dust pollution. Ordinary insulation structure adapted to the frequent contact with the trunk and the environment more serious dust pollution of the occasion. Multi-core cable structure in spite of the space with a small, flexible laying, etc., but the line maintenance is not convenient.
Characteristic of Multi-core Overhead Insulated Cable
Polyethylene, PVC insulated cable long-term allowable working temperature does not exceed 70 ℃, XLPE insulated cable long-term allowable working temperature does not exceed 90 ℃. The short-circuit (within 5 seconds) polyethylene insulated cable allows operating temperature does not exceed 130 ℃, PVC insulated cable does not exceed 160 ℃, XLPE insulated cable does not exceed 250 ℃.
The ambient temperature of the installation is not lower than -20 ℃. If the outer diameter of cable is less than 25mm, the permissible minimum bending radius is 4 times of the outer diameter of the cable. If the outer diameter of the cable is 25mm or more, the minimum bending radius is 6 times of the outer diameter of the cable. The minimum bending radius shall not be less than 15 times the sum of the outer diameter of the cable and the outer diameter of the conductor. The single core cable shall not be less than 20 times the sum of the outer diameter of the cable and the outer diameter of the conductor.