What's the difference between non-marking line and national standard line?

The distinction between national standard lines and non-standard lines of wires and cables is as follows:

1, depends. See if there is a quality system certificate; See if the certificate is standardized; See if there is a factory name, address, inspection stamp and production date; See if there are any trademarks, specifications, voltages, etc. Printed on the wire. It also depends on the cross section of the copper core of the wire. Superior copper is bright and soft, otherwise it is inferior.

2. Give it a try. It is recommended to bend the end of the wire repeatedly by hand. All products with soft hand feel, good fatigue strength, elasticity in plastic or rubber, and no crack on conductor insulator are excellent products.

Step 3 weigh. High quality welding wire is usually within the specified weight range. For example, the common plastic insulated single-stranded copper conductor with a cross section of 1.5mm2, per 100m weight1.8 ~1.9kg; 2.5mm2 plastic insulated single-stranded copper core wire, with a weight of 3-3.1kg per 100m; The weight of 4.0mm2 plastic insulated single copper core wire is 4.4 ~ 4.6kg1300m. The wires with poor quality have insufficient weight or length, or the copper core of the wires has too many impurities.

4. Compare prices. Because of the low production cost of fake and shoddy wires, vendors often sell them at low prices under the guise of good quality and low price, which makes people fall for it.

5. Look at copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch. False copper core wire is purple-black, yellow or white, with many impurities and poor mechanical strength and toughness. It will break with a little force, often breaking wires. When checking, just peel off one end of the wire by 2cm, and then gently rub it on the copper core with a piece of white paper. If there is a black substance on the white paper, it means that there are many impurities in the copper core.

Extended data:

yard measure

1, appearance standard, wire must have certification mark, manufacturer, wire diameter, etc. , ground wire with yellow-green insulation layer.

2. Mechanical strength

3. Sheath insulation (generally greater than 100 mω) and compressive strength (below 500V, 1500V)

4, line resistance (a certain wire diameter, conductivity, length is not greater than a certain resistance)

5. Under the high temperature impact of 150 degrees, the wire should not crack at the low temperature of -30 degrees.

The national standard line is 100 0.5m/ volume.

Some are only 60-75 meters/roll without marking.

1, it depends

See if there is a quality system certificate; See if the certificate is standardized; See if there is a factory name, address, inspection stamp and production date; See if there are any trademarks, specifications, voltages, etc. Printed on the wire. It also depends on the cross section of the copper core of the wire. Superior copper is bright and soft, otherwise it is inferior.

2. Try it

It is recommended to bend the end of the wire repeatedly by hand. All products with soft hand feel, good fatigue strength, elasticity in plastic or rubber, and no crack on conductor insulator are excellent products.

Step 3 consider

High quality welding wire is usually within the specified weight range. For example, the common plastic insulated single-stranded copper conductor with a cross-sectional area of 1.5mm2, per 100 m weight1.8 ~1.9kg; 2.5mm2 plastic insulated single-stranded copper core wire, with a weight of 3 ~ 3 100 m1kg; The weight of 4.0mm2 plastic insulated single copper core wire is 4.4 ~ 4.6kg per100mm, and the poor quality wire has insufficient weight or length, or there are too many impurities in the copper core of the wire.

Step 4 look at copper

Qualified copper core wire copper core should be purple, shiny and soft to the touch. False copper core wire is purple-black, yellow or white, with many impurities and poor mechanical strength and toughness. It will break with a little force, often breaking wires.

When checking, just peel off one end of the wire by 2 cm, and then gently rub it on the copper core with a piece of white paper. If there is a black substance on the white paper, it means that there are many impurities in the copper core. In addition, the insulation of fake and inferior wires seems to be very thick. In fact, most of them are made of recycled plastics. Over time, the insulation layer will age and leak electricity.

Step 5 look at the price

Because of the low production cost of fake and shoddy wires, vendors often sell them at low prices under the guise of good quality and low price, which makes people fall for it.

Wire refers to the wire that transmits electric energy. There are bare wires, electromagnetic wires and insulated wires. Bare wires have no insulation, including copper-aluminum flat wires, overhead stranded wires and various profiles (such as special-shaped wires, buses, copper bars, aluminum bars, etc.). ). Mainly used for outdoor overhead and indoor buses and switch boxes.

Electromagnetic wire is an insulated wire that generates a magnetic field or induces a current in the magnetic field after being electrified. It is mainly used for windings of related electromagnetic equipment such as motors and transformers. Its conductor is mainly copper wire, with thin insulation layer and good electro-pneumatic mechanical properties, as well as heat resistance, moisture resistance and solvent resistance. Different characteristics can be obtained by selecting different insulating materials.

There are two kinds of electromagnetic wires: enameled wire and wound wire. Enamelled wire is made by coating insulating paint on bare copper wire. The insulating layer is thin and occupies a small volume. Widely used in various electrical appliances and instruments. The performance of enameled wires varies with the nature of insulating materials used. Winding wires mainly include yarn-covered wire, silk-covered wire, glass-covered wire, paper-covered wire and plastic film-covered wire, among which yarn-covered wire and silk-covered wire may be eliminated because of their poor temperature resistance and large occupation volume.

Glass-covered wire is a round copper wire wrapped with glass fiber and impregnated with silicone resin, which can withstand the high temperature of 180℃ and has good insulation performance and mechanical strength. Paper-wrapped wires are mainly used for oil-immersed transformers. Plastic film winding is made by baking and melting polyimide film coated with some adhesive around the conductor. Its insulating layer is tough and elastic, easy to wind, wear-resistant and heat-resistant, and is widely used in space navigation and other equipment.

Insulated wire is generally composed of conductive wire core, insulating layer and protective layer. The wire core can be divided into four configurations according to the use requirements: hard, soft, mobile and extra soft. There are four kinds of wire cores: single core, double core, three core and four core. The insulating layer is usually made of rubber, plastic, etc. This kind of insulated wire is widely used in various instruments, telecommunication equipment, power lines and lighting lines with AC voltage below 500 volts and DC voltage below 1 000 volts.

As the main carrier of power transmission, wires and cables are widely used in electrical equipment, lighting lines, household appliances and other fields, and their quality directly affects the engineering quality and the safety of consumers' lives and property. There are many kinds of wires in the market, so you should use the appropriate wires according to your own power load.

Wire surface marking —— According to national standards, the wire surface should have continuous marking of manufacturer's name, product model and rated voltage. This is conducive to finding the manufacturer in time when there are problems in the use of wires, and consumers must pay attention to this when purchasing wires. At the same time, consumers should pay attention to whether the manufacturer's name, product model and rated voltage indicated on the certificate are consistent with the signs printed on the wire surface to prevent counterfeit products.

Appearance of the wire-consumers should pay attention to the appearance of the wire when purchasing it. The insulation and sheath are not damaged, the logo is clearly printed, and the hand-molded wire has no greasy feeling. Seen from the cross section of the conductor, the thickness of the insulation or sheath should be uniform over the entire circumference of the conductor and not eccentric. Insulation or sheath should have a certain thickness.

Conductor wire diameter-consumers should pay attention to whether the conductor wire diameter is consistent with the cross section indicated on the certificate when purchasing wires. If the cross section of the conductor is too small, it is easy to heat the conductor and cause short circuit. It is suggested that the conductor used for household lighting lines should be 1.5 mm2 or above; High-power household appliances such as air conditioners and microwave ovens should use wires of 2.5 square millimeters or more.

Standardized use-wiring should be standardized, and it is best to use BV single-core wire to penetrate the pipe for fixed lines. Be careful not to damage the wires when wiring and room decoration; Do not join in the middle of the route; Do not touch the wire when it is connected to the electric box (box); In addition, household appliances with large electricity consumption, such as air conditioners, should be powered by separate wires; It is best to keep a certain distance from the wires used for weak current and strong current.

Common faults of cable lines include mechanical damage, insulation damage, insulation moisture, insulation aging and deterioration, overvoltage, cable overheating and so on. When the above-mentioned fault occurs in the line, the power supply of the fault cable should be cut off, the fault point should be found, the fault should be checked and analyzed, and then the fault should be repaired and tested. Power supply can only be restored after troubleshooting.

References:

Baidu encyclopedia-GB wire