Those who have contacted the wire and cable industry know more or less that there is a difference between national and non-standard lines in the wire and cable industry. The existence of non-standard lines has seriously threatened the safety of people's lives and property, and many of the tragic fires caused by non-standard markings are constantly alerting us. Non-standard markings are not only problems in the wire and cable industry, but also the lives and property of people. Relevant issues that are closely related to combating and resisting non-standard markings are obligations that each of us should fulfill.
A national standard wire and cable:
It is a wire that is produced exactly in accordance with the national standard. General domestic and common wires are standard specifications. The national standard specifies the common five specifications.
The two main criteria are:
1. The appearance of the standard, the wire must have certification marks, manufacturers, wire diameter, etc., ground with a yellow-green insulation layer 2. Mechanical strength 3. Sheath insulation (generally greater than 100MΩ) and compressive strength (1500V below 500V)
4. Wire resistance (a certain wire diameter, conductivity, and length are not greater than a certain resistance)
5. Under high temperature impact of 150 degrees, the wire may not crack at a temperature of -30 degrees.
The distinction between the three national standards and non-national standards:
The excellent grade of the national standard line is 100±0.5 meters/volume, and some non-standard marking lines are only 80-95 meters/volume, which is generally 95 meters. The 95 line says that this 95 meters is marked with a non-standard line of 100 meters.
1 depends on. See if there is a quality system certification; see whether the certificate is standardized; see if there is a factory name, site, inspection seal, and production date; see if the trademark is printed on the wire, specifications, voltage, etc. Also look at the cross section of the wire copper core, superior product copper color bright, soft color, otherwise it is defective.
2 to try. It is advisable that a wire head be repeatedly bent by hand, and that any product that has soft hand feeling, good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation body is superior.
3 weigh. Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-stranded copper 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 to 3.1 kg per 100 m; 4.0 mm2 The plastic insulated single-stranded copper cores have a weight of 4.4 to 4.6 kg per 100 m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core.
4 see the copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch. The shoddy copper core copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break when it is hardened, and the wire is often broken. When checking, you just strip the wire 2 cm, and then use a piece of white paper to slightly squat on the copper core. If there is black material on the white paper, the copper core contains more impurities. In addition, the counterfeit wire insulation seems to be very thick, in fact, most of them are made of recycled plastic. Over time, the insulation layer will age and leak.
5 look at the price. Because of the low cost of making fake and shoddy wires, when selling, traders often sell at a low price for good value, which makes people fooled.
A national standard wire and cable:
It is a wire that is produced exactly in accordance with the national standard. General domestic and common wires are standard specifications. The national standard specifies the common five specifications.
The two main criteria are:
1. The appearance of the standard, the wire must have certification marks, manufacturers, wire diameter, etc., ground with a yellow-green insulation layer 2. Mechanical strength 3. Sheath insulation (generally greater than 100MΩ) and compressive strength (1500V below 500V)
4. Wire resistance (a certain wire diameter, conductivity, and length are not greater than a certain resistance)
5. Under high temperature impact of 150 degrees, the wire may not crack at a temperature of -30 degrees.
The distinction between the three national standards and non-national standards:
The excellent grade of the national standard line is 100±0.5 meters/volume, and some non-standard marking lines are only 80-95 meters/volume, which is generally 95 meters. The 95 line says that this 95 meters is marked with a non-standard line of 100 meters.
1 depends on. See if there is a quality system certification; see whether the certificate is standardized; see if there is a factory name, site, inspection seal, and production date; see if the trademark is printed on the wire, specifications, voltage, etc. Also look at the cross section of the wire copper core, superior product copper color bright, soft color, otherwise it is defective.
2 to try. It is advisable that a wire head be repeatedly bent by hand, and that any product that has soft hand feeling, good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation body is superior.
3 weigh. Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-stranded copper 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 to 3.1 kg per 100 m; 4.0 mm2 The plastic insulated single-stranded copper cores have a weight of 4.4 to 4.6 kg per 100 m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core.
4 see the copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch. The shoddy copper core copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break when it is hardened, and the wire is often broken. When checking, you just strip the wire 2 cm, and then use a piece of white paper to slightly squat on the copper core. If there is black material on the white paper, the copper core contains more impurities. In addition, the counterfeit wire insulation seems to be very thick, in fact, most of them are made of recycled plastic. Over time, the insulation layer will age and leak.
5 look at the price. Because of the low cost of making fake and shoddy wires, when selling, traders often sell at a low price for good value, which makes people fooled.
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