1. Classification and use are used to distribute current, belonging to the category of electrical wires, represented by the letter "B";
2. The conductor material is copper, represented by the letter "T", and the copper core conductor in the wire is omitted;
3. The insulation material is polyvinyl chloride, represented by the letter "V";
4. The structure of the wire is simple, in addition to the three points above, some also have a sheath, and the sheath material is polyvinyl chloride, which is also represented by the letter "V"; If the sheath material is rubber, it is represented by the letter "X". There is no need to indicate if there is no protective cover or if there is none at the back. For example, BVV: refers to copper core polyvinyl chloride insulated polyvinyl chloride sheathed circular wire.

Wire selection
1. Red is generally used for live wires (yellow can be used as an alternative), blue and green are generally used for neutral wires, and yellow and green are used for ground wires;
2. Lighting generally uses 1.5 square meter single core wires, divided into two groups according to different colors (live wire and neutral wire);
3. Sockets generally use 2.5 square meters of single core wires, while air conditioners with a capacity of 3 horsepower or more generally use single core wires with a size of 4 square meters or more;
4. The household bus generally uses single core wires of 6 square meters or more;
5. The specific configuration and usage quantity can be consulted with online customer service or purchased according to the requirements of electricians.

Applicable scope
Ordinary insulated wires, household wires, are the most commonly used type of wire. Taking a 100 square meter new house as an example, a 4 square meter copper core BV wire of 200 meters, a 2.5 square meter BV wire of 400 meters, a 1.5 square meter BV wire of 300 meters, and a 1.5 square meter copper core BV dual color wire of 100 meters. The above is about non ceiling decoration. If you want a ceiling, the 1.5 line is even more. There are several other types of BV wire diameters: 0.2, 0.3, 0.4, 0.5, 300, and 400 square meters. Generally used in fixed situations, specifications of 10 square meters or more consist of 7 copper wires, and are mostly used in fixed buried environments.