First look at the structure. There are many layers of high-voltage cable, and the outermost layer is stripped with armor, shielding layer, insulation layer, conductor, etc. Low-voltage cables are usually pulled out of the outermost layer, where the insulation or wires are inside.
Low-voltage cable insulation is generally within 3 mm, high-voltage cable insulation is generally more than 5 mm.
Again, you can see the nameplate on the outermost layer of the cable. The relevant parameters of the cable are generally printed on the outermost layer of the cable, including the cable model, cross-sectional area, rated voltage, length and other parameters