Six differences between national and non-standard cables from stone cables

The distinction between national standard and non-national standard: The national standard line inferior product is 100±0.5 meters/volume, some non-standard lines only need 80-95 meters/volume, usually 95 meters, and 95 lines mean this kind of 95 meters mark. 100 meters of non-standard lines.

I. National Standard Wire and Cable: It is a wire that is consumed exactly in accordance with the national standard. Ordinary households, rare wires are standard specifications, and the national standard rules rare 5 types of functions.

II. Main trade-off criteria: appearance criteria, certification marks, manufacturers, wire diameters, etc. on the off- limb cables and wires, insulation of the strength of the yellow-green insulating layer of the ground cable (commonly greater than 100M) and compressive strength (below 500V) Wire resistance (under a certain wire diameter, electrical conductivity, and length is not more than a certain resistance at high temperature and 150 degrees at high temperature, no wire cracking may occur at a low temperature of -30 degrees.

Three. Look. See if there is a quality system certification; see whether the certificate can be standardized; see if there is a factory name, site, inspection seal, consumption date; see if there are trademarks, specifications, and voltages printed on the wire. It also depends on the cross section of the copper core of the electric wire. The bright and soft color of the copper of the inferior product is defective.

Four. To try. The liberated cable may take one electric wire and lightly bend it by hand. Any product that has soft hand, good anti-fatigue strength, high elasticity of plastic or rubber feel, and no crack on the electric wire insulator is inferior.

Five. Weighing. Wires of good quality are generally within the weight of the rule. For example, the commonly used plastic insulated single-stranded copper core wire with a cross-sectional area of ​​1.5 mm2 is 1.8-1.9 kg per 100 m; a 2.5 mm2 plastic insulated single-stranded copper wire weight is 3-3.1 kg per 100 m; 4.0 mm2 Plastic insulated single-stranded copper wire, with weight of 4.4 to 4.6 kg per 100 m.

6. Look at the copper. Qualified copper core wire copper core should be purple white, shiny and soft to the touch. Counterfeit copper core copper core is purple black, yellowish or white, impurities, poor machine strength, poor toughness, will be broken when a little hard, often within the wire broken phenomenon. Just strip the wire 2 cm, and then use a piece of white paper on the copper core to make a slight click. The black material on the white paper indicates that the copper core has more impurities.