What do the numbers and letters on the packaging of domestic power cords mean?

Many people can see many numbers, letters, and symbols on the packaging when purchasing power cables. What do these letters and symbols mean? Below, Dongguan Lanyue Electronics has organized the following content, let's take a look.

The model of wires and cables in our country consists of 7 groups of letters and numbers.

The first group consists of one to two letters, indicating the type and purpose of the wire.

For example: A - installation wire, B - cloth wire, C - marine cable, K - control cable, N - agricultural cable, R - soft wire, U - mining cable, Y - mobile cable, JK - insulated overhead cable, M - for coal mines, ZR - flame retardant type, NH - fire-resistant type, ZA - Class A flame retardant.
ZB - Class B flame retardant, ZC - Class C flame retardant, WD - low smoke halogen-free type.

The second group is one letter, indicating the material of the conductor.

For example: T - copper core wire (usually omitted), L - aluminum core wire.

The third group is one letter, indicating the insulation layer.

For example: V - PVC plastic, YJ - XLPE insulation, X - rubber, Y - polyethylene, F - polytetrafluoroethylene.

The fourth group is one letter, indicating the sheath.

For example: V - PVC sheath, Y - polyethylene, N - nylon sheath, P - copper wire braided shield, P2 - copper tape shield, L - cotton yarn braided waxed cloth, Q - lead sheath.

The fifth group is one letter, indicating characteristics.

For example: B - flat type, R - flexible, C - heavy duty, Q - light type, G - high voltage, H - for welding machines, S - twisted pair.

The sixth group is a number, indicating the armored layer (subscript).

2 - double steel tape, 3 - fine round steel wire, 4 - coarse round steel wire.

The seventh group is one letter, indicating the outer sheath (subscript).