The electric wire is composed of one or several soft wires, which are covered with a light and soft protective layer, which is used to carry electric current. There are various forms such as solid, stranded or foil woven. According to the insulation status, it is divided into two categories: bare wires and insulated wires.
The cable is composed of one or more insulated conductive wires placed in a sealed sheath. A protective cover layer can be added to transmit, distribute electric energy or transmit electrical signals. The main difference between it and ordinary wires is that the cable size is larger and the structure is more complicated. The cable is mainly composed of four parts: a conductive core, an insulating layer, a sealing sheath and a protective covering layer. According to its purpose, it can be divided into power cables, communication cables and control cables.
Wires used for circuit decoration are usually collectively referred to as wires and cables, and there is no strict boundary between wires and cables. Generally, cables are not needed in home improvement, and wires meet the requirements.
1. Hard wire, professionally known as BV wire, is mainly used for power supply, lighting, sockets, air-conditioning, and is suitable for cables and wires for power plants, household appliances, meters and telecommunication equipment with AC voltage of 450/750V and below. Hard wire has a certain degree of hardness, which is more convenient in terms of bending and straightening.
2. The flexible cord is professionally called BVR wire, which is suitable for cables and wires used in power plants, household appliances, meters and telecommunication equipment with AC voltage of 450/750V and below, such as distribution boxes. Flexible wire is more complicated to manufacture than hard wire, and high-frequency circuit flexible wire carries more capacity than hard wire.
3. Hard and soft wires (weak wires) are respectively composed of a single and several copper core wires, generally referring to network wires, wires and cables with relatively low voltage.
The square of the wire refers to the size of the wire. Common sizes are 1.5 square, 2.5 square, 4 square, 6 square, and 10 square. The square of the wire is square millimeter, which refers to the cross-sectional area of the wire.
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