Buy wire and cable must pay attention to the problem: the national standard line standard
1. Appearance standards, the wire must be certified mark, manufacturer, wire diameter, etc., the ground with yellow-green insulation
2. Mechanical strength
3. Sheathing of the insulation (generally greater than 100MΩ) and compressive strength ( 500V above 1500V below)
4. wire resistance (a certain wire diameter, conductivity, length not greater than a certain resistance)
5. high-temperature impact of 140 degrees, low temperature -30 degrees under the wire shall not be cracked, etc..