People who have been in contact with the wire and cable industry know more or less that there are national and non-standard lines in the wire and cable industry. The existence of non-standard lines has seriously threatened people's lives and property. Many tragic fires caused by non-standard lines are also alerting us all the time. Non-standard lines are not only problems in the wire and cable industry, but also people's lives and property. Interest-related issues, combating and resisting non-marking lines are the obligations of each of us.
A national standard wire and cable:
It is a wire that is produced in full accordance with the national standard. Generally, household and common wires are of standard specifications. The national standard specifies the common five specifications.
Two main metrics:
1. Appearance standard, the certification mark, manufacturer, wire diameter, etc. must be on the wire, and the ground wire is yellow-green insulation layer.
2. Mechanical strength
3. Insulation of the sheath (generally greater than 100MΩ) and compressive strength (1500V below 500V)
4. Line resistance (a certain wire diameter, conductivity, length is not greater than a certain resistance)
5. Under high temperature impact of 150 degrees, the wire shall not crack under low temperature -30 degrees.
The distinction between the three national standards and the non-national standard:
The national standard line is 100±0.5 m/volume, and the non-standard line is only 80-95 m/vol. Generally, it is mostly 95 meters. The 95 line is the 95-meter non-standard line marked with 100 meters.
1 to see. Look at the quality system certification; see if the certificate is standardized; see if there is a factory name, site, inspection chapter, production date; see if the trademark is printed on the wire, specifications, voltage, etc. Also look at the cross section of the copper core of the wire, the superior color of the copper color is bright, the color is soft, otherwise it is a defective product.
2 to try. It is advisable to repeatedly bend a wire head by hand. Any soft touch, good fatigue resistance, strong plastic or rubber feel and no crack on the wire insulation are excellent products.
3 weighs. 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 ​​1.5mm2 is 1.8-1.9kg per 100m; the plastic insulated single-strand copper core wire of 2.5mm2 is 3~3.1kg per 100m; 0mm2 plastic insulated single-strand copper core wire, 4.4~4.6kg per 100m weight. Poor quality wires have insufficient weight, either insufficient length or excessive copper core impurities.
4 look at copper. The copper core of the qualified copper core wire should be purple, shiny and soft to the touch. The copper core of the inferior copper core wire is purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and will break when a little force is applied, and the wire is often broken. When inspecting, you only need to peel off the wire 2cm, and then use a piece of white paper to slightly rub the copper core. If there is black substance on the white paper, it means that there are more impurities in the copper core. In addition, the inferior wire insulation layer seems to be very thick, and in fact it is mostly made of recycled plastic. Over time, the insulation layer will age and leak.
5 look at the price. Due to the low production cost of counterfeit and shoddy wires, traders often sell at low prices with low prices and good prices when selling.
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