What is the national standard power cord?

　　People in the wire and cable industry know more or less that there are national standard lines and non-standard lines in the wire and cable industry. However, many people do not know what the national standard power cord standard is. As a result, the purchase of non-national standard cables may eventually lead to fire disasters. Non-standard cables are not only a problem in the wire and cable industry, but are closely related to people’s lives and property. Fighting against and resisting non-standard lines is the obligation of each of us.

　　1. National standard wire and cable:

　　It is the wire produced in full accordance with the national standard. General household and common wires have standard specifications and performance, and the national standard specifies 5 common specifications and performance.

　　2. Main measurement standards:

　　1. Appearance standard, there must be certification mark, manufacturer, wire diameter, etc. on the wire, and the ground wire uses a yellow-green insulation layer

　　2. Mechanical strength

　　3. Insulation (generally greater than 100MΩ) and compressive strength (1500V below 500V) of the sheath

　　4. Wire resistance (no more than a certain resistance under a certain wire diameter, conductivity, and length)

　　5. Under the high temperature impact of 150 degrees, the wires must not be cracked under the low temperature of -30 degrees.

　　3. The distinction between national standard and non-national standard:

　　The national standard line premium product is 100±0.5 meters/roll, some of the non-marked lines are only over 80-95 meters/roll, generally 95 meters are mostly, the 95 line refers to this kind of 95 meters but marked with 100 meters of non-marking lines.

　　1 It depends on whether there is a quality system certification; whether the certificate is standardized; whether there is a factory name, site, inspection stamp, and production date; whether there are trademarks, specifications, voltages, etc. printed on the wires. It also depends on the cross-section of the copper core of the wire. The high-quality copper is bright in color and soft in color, otherwise it is inferior.

　　2 to try. It is recommended to bend a wire head repeatedly by hand. Anything with soft hand feel, good fatigue resistance, plastic or rubber hand feel elastic and no cracks on the wire insulator is the best product.

　　3 Weigh the weight. Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of 1.5 mm2 has a weight of 1.8 ~ 1.9 kg per 100 m; a 2.5 mm2 plastic insulated single-strand copper core wire has a weight of 3 ~ 3.1 kg per 100 m; 4.0 mm2 The plastic insulated single-strand copper core wire weighs 4.4 to 4.6 kg per 100 m. Poor quality wires have insufficient weight, either the length is insufficient, or the copper core of the wire is too impurity.

　　4 Look at the copper. The copper core of the qualified copper core wire should be purple-red, shiny, and soft to the touch. The fake and inferior copper core wires are purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and will break with a little force, and there are often broken wires in the wires. When checking, you only need to peel off the wire 2 cm at one end, and then rub it on the copper core with a piece of white paper. If there is black substance on the white paper, it means that there are more impurities in the copper core. In addition, the insulating layer of fake wires seems to be very thick, but in fact, most of them are made of recycled plastics. Over time, the insulating layer will age and cause leakage.

　　5 Look at the price. Due to the low production cost of counterfeit and shoddy wires, vendors often sell them at low prices under the guise of low prices and good quality when selling.

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