Cable high voltage and low voltage distinction method:

1. View the cross section. The innermost part of the cable is the conductive core (copper core or aluminum core), and the outermost are: insulating layer, semi-conductive layer, shielding layer, filling layer, steel protective layer, and rubber protective layer (water blocking).

Second, the production depends on the thickness of the insulating layer:

(1) Low voltage (below 1kv) 1~3mm thick, 10kv cable 5~8mm, 35kv cable about 10mm; low voltage or weak current cables generally have an insulating layer and a protective layer.

(2) The high-voltage cable has an insulating layer after the outer sheath is removed, which is the main insulating layer that is wrapped around the cable core and is white like plastic. The low-voltage cable does not have this main insulating layer, but only a rubber protective layer.

3. Check the voltage registration. There are generally voltage levels such as YJV-1KV-4*150 or YJV-10KV-4*150 on the drawings.

According to different voltage levels, cables are habitually divided into:

1) Weak current cable: 450/750V and below;

2) Low voltage cable: 0.6/1kV;

3) Medium voltage cable: 3-35kV;

4) High voltage cable: 35-110kv;

5) High voltage cable: 110-750kV.