If it is indeed a non-standard cable (such as a negative square conductor), you can complain to the local Technical Supervision Bureau. The penalty can be several times the amount of the cable, and the cable can even be confiscated. Those who cause accidents may be held criminally responsible. 1. Look carefully. First, check whether the model, cross-section, voltage, production date, etc. on the certificate are complete. Second, check whether the voltage, serial number, and manufacturer name are printed on the copper wire. Third, check the copper quality. High-quality copper is purple-red, bright in color, and soft in luster. Inferior copper is black, yellow or white in color, has poor toughness and will break with a little force.

2. Measurement. Measure the length and wire diameter of 100 meters, the national standard line is 100 meters, the plus or minus error is 0.5 meters, the false line is shorter than 5 meters to 15 meters, and the wire diameter is relatively thin.

3 Weighing: 1.5 square meters weighs about 2.2 kilograms, 2.5 square meters weighs about 3.2 kilograms, 4 square meters weighs about 4.8 kilograms, 6 square meters weighs about 6.5 kilograms. The difference between national standard and non-national standard is 100± 0.5m/roll non-marked wire, some are only 60-75m/roll 1. Check whether there is a quality system certification and whether the certificate is standardized; check whether there is factory name, factory address, inspection seal, production date; check the wire Whether the trademark, specifications, voltage, etc. are printed on it. Also look at the cross-section of the copper core of the wire. High-quality copper is bright and soft in color, otherwise it is a defective product. 2. A piece of wire can be used for the experiment... The difference between national standard and non-national standard wires

The best national standard wire is 100±0.5 meters/roll

Some non-standard wires are only 60-75 meters Meters/roll

Extended information 1. What to look for

Check whether there is a quality system certification and whether the certificate is standardized; check whether there is a factory name, factory address, inspection seal, and production date. ; Check whether the trademark, specification, voltage, etc. are printed on the wire. Also look at the cross-section of the copper core of the wire. High-quality copper is bright and soft in color, otherwise it is a defective product.

2. Experiment

You can take a piece of wire and bend it repeatedly by hand. Any wire that feels soft to the touch, has good fatigue resistance, has high plastic or rubber feel and has no cracks in the wire insulation is suitable. Premium product.

3. Weighing

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 weighs 1.8 to 1.9 kg per 100 m; the plastic insulated single-strand copper core wire with a cross-sectional area of ??2.5 mm2 weighs 3 to 3.1 kg per 100 m. kg; 4.0 mm2 plastic insulated single-strand copper core wire weighs 4.4 to 4.6 kg per 100 m, etc. Poor quality wires have insufficient weight, are either not long enough, or have too many impurities in the copper core of the wire.

4. Look at the copper quality

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

5. Look at the price

Due to the low production cost of fake and inferior wires, vendors often sell them at low prices under the guise of low price and high quality, which deceives people. All