# The difference between 3 + 2 and 4 + 1 on wires and cables

There are single core cables and multi-core cables. Some users who don’t understand have doubts. 3 + 2 core cables and 4 + 1 core cables are all 5-core cables. Is there any difference between them? The following small series to introduce the wire and cable 3 + 2 and 4 + 1 core meaning and difference.

1. The difference between wire and cable

The wire is composed of one or several soft wires with light and soft protective layer;

The cable is composed of one or several insulated wires, which are wrapped with a tough outer layer made of metal or rubber.

2. 3 + 2 and 4 + 1 on the wire represent the number of cores of a cable. There are 2 or 3, 3 + 2, 4 + 1 and 5 mutually insulated wires in a cable, which are called 2-core or 3-core, 3 + 2, 4 + 1 and 5 core wires respectively.

3.Take power cable YJV as an example

YJV 3 + 2 core

3 + 2 cable 3 is three phase lines (L1, L2, L3 phase lines, the three lines with the largest diameter), the diameter of the line is the same, 2 is the zero line and PE line, (learn more cable technology, please click here, a large number of dry goods waiting for you) one line is used for connecting the zero line (n neutral line, the diameter is smaller than L1, L2, L3), one line is used for grounding wire (PE grounding protection line, the diameter is smaller than L1, L2, L3 are also small).

4.YJV 4 + 1 core

In 4 + 1 cable, 4 means that the diameter of three phase wires is the same as that of zero wire, and 1 means that PE grounding wire is a single diameter; 4 + 1 means that a cable consists of four wires, one of which is used for grounding wire (L1 phase wire), one for neutral wire (n neutral wire) and one for grounding wire (PE grounding protection wire).