1. Check the section.Cable conductive core (copper core or aluminum core), followed by the outer: insulation layer, semi-conductive layer, shielding layer, filling layer, maintenance layer, rubber maintenance layer (water resistance).

Ii. Thickness of insulation layer:

(1) high voltage (under 1kv)1~3mm thick, 10kv cable 5~8mm, 35kv cable about 10mm;High-voltage or low-current cables are generally provided with one insulation layer and one maintenance layer.

(2) after removing the outer shell of the high voltage cable, the insulation layer is the white main insulation layer like plastic wrapped in the cable core. The high voltage cable does not have the main insulation layer, but only the rubber maintenance layer.

Check voltage cancellation.Generally, there will be yjv-1kv-4 *150 or yjv-10kv-4 *150 and so on at the bottom of the drawing.