What are Standard Wire and Conduit Sizes?

National standard wires, that is, wires produced in full accordance with national standards. General household and common wires are in compliance with the standard specifications and performance, and the national standard stipulates the performances of five common specifications.

GB wire

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National standard wires, that is, wires produced in full accordance with national standards. General household and common wires are in compliance with the standard specifications and performance, and the national standard stipulates the performances of five common specifications.

Chinese name

GB wire

Foreign name

National standard wire

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

1.Appearance standards, the certification mark, manufacturer, wire diameter, etc. must be on the wire, and the yellow-green insulation layer for the ground wire

2.Mechanical strength

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

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

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

The national standard line superior product is 100 ± 0.5 meters / roll

Non-marking lines are only 60-75 meters / roll

1.It depends

See if there is a quality system certification; see if the certificate of conformity is standardized; see if there is a factory name, site, inspection stamp, production date; see if there are trademarks, specifications, voltages, etc. on the wires It also depends on the cross section of the copper core of the wire. The superior copper is bright and soft, otherwise it is defective.

2.To try

It is advisable to repeatedly bend a wire end by hand. Anything that is soft to the touch, has good fatigue resistance, plastic or rubber has a high elasticity, and has no cracks on the wire insulator is a superior product.

3.Weighing

Good quality wires are generally within the specified weight range. For example, plastic insulated single-stranded copper core wires with a cross-sectional area of 1.5 mm2 weigh 1.8 to 1.9 kg per 100 m; 2.5 mm2 plastics insulated single-strand copper core wires weigh 3 to 3.1 per 100 m kg; 4.0 mm2 plastic insulated single-stranded copper core wire, 4.4-4.6 kg per 100 m. Poor quality wires have insufficient weight, either insufficient length or excessive copper core impurities.

4, look at copper

Qualified copper core wire copper core should be fuchsia, shiny, soft to the touch. The inferior copper core wire is purple black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will be broken with a little force, and the wire is often broken. During the inspection, you just need to peel off one end of the wire by 2 cm, and then rub the copper core with a piece of white paper. If there is black matter on the white paper, it means that there are more impurities in the copper core. In addition, the shoddy wire insulation seems to be very thick. In fact, most of it is made of recycled plastic. Over time, the insulation will age and leak electricity.

5, look at the price

Due to the low cost of making fake and shoddy wires, vendors often sell at low prices under the guise of cheap and good quality when selling, which makes people fooled.