The Use of Overhead Cables

How to use overhead cables:

1.The rated voltage is 1,10KV.

2.Cable laying temperature should not be lower than -20°C.

3.Long-term operating temperature of the cable:
    Polyvinyl chloride (PVC), polyethylene (PE) insulation should not exceed 70 °C;
    Crosslinked polyethylene (XLPE) insulation should not exceed 90°C.

4. The highest temperature of the cable conductor at the time of short circuit ( the longest duration does not exceed 5 seconds ) ; the insulation of the polyvinyl chloride does not exceed 160 ℃; the polyethylene insulation does not exceed 150 ℃ ; and the cross - linked polyethylene insulation does not exceed 250 ℃.

10KV cable
Single core cable 20 (D+d) ±0.5%.
Multicore cable 15 (D+d) 0.5%.

1KV cable
     Cable outer diameter D<25mm......4D;
     Cable diameter D≥25mm......6D.
     In the formula: D----- the actual outer diameter of the cable (mm);
                  d------- the actual outer diameter (mm) of the conductor.

The use of overhead cables: overhead cable is a kind of cable construction method that hangs the cable rack on the pole with a certain height from the ground. Compared with the underground cable, although it is more vulnerable to external influences, it is not safe enough and it is not beautiful, but it is easy to erect and the construction cost is low. Therefore, it is far away from the office, the number of users is small and the change is large, and it is still widely used where laying underground cables is difficult.