1. The difference between wires and cables
The wire is composed of one or several soft wires, and the outer covering is covered with a light and soft protective layer;
A cable is composed of one or several insulated and covered wires, which are then covered with a tough outer layer made of metal or rubber.
2. The 3+2 and 4+1 on the wires indicate the number of cores of a cable.
There are 2 or 3, 3+2, 4+1, and 5 wires that are insulated from each other in a cable. They are called 2 cores or 3 cores, 3+2 cores, 4+1 cores, and 5 cores respectively.
3. Take the power cable YJV as an example below
3 of the 3+2 cable is the three phase wires (L1, L2, L3 phase wires, the diameter of the three wires is the largest) of the same diameter, 2 is the neutral wire and the PE wire, and one wire is used to connect the neutral wire (N in The diameter of this wire is smaller than L1, L2, and L3), and one wire is used to connect to the grounding wire (PE grounding protection wire, this diameter is also smaller than that of L1, L2, and L3).
4 . YJV 4+1 core
The 4 of the 4+1 cable means that the diameters of the three phase wires and the neutral wire are the same, 1 means that the PE ground wire has a single diameter; 4+1 means that a cable consists of 4 wires, one of which is used to connect to the live wire (L1 phase wire). ), one wire is used to connect to the neutral wire (N neutral wire), and one wire is used to connect to the ground wire (PE grounding protection wire).