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Identify the pros and cons of buying wires

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Identify the pros and cons of buying wires

作者: Release Date: 2018-07-02 Author: Click:

Identify the pros and cons of buying wires

1. Color from appearance: For copper-core wires, the color of pure copper is reddish according to the physical properties of copper, so if the color of the copper core is reddish yellow, it indicates that the quality of the copper material is better; A white in the core yellow indicates a lower copper quality. For the aluminum core wire, the regular pure aluminum core should emit silver and white light, while the darker and less bright core is inferior aluminum and the quality is not good.

2. Manually measure the toughness of wires: You can bend the wires by hand to test its flexibility. Wires with reliable quality have good toughness and are easy to fold. Insufficient quality wires will break or even peel off the insulation layer after repeated bending.

3. Measure the length and cross-section of the wire: According to relevant regulations, the error of the length of the wire must not exceed 5%, and the diameter of the cross-sectional area must not exceed 0.02%. Most wires on the market are short of two kilograms in length and falsified in cross-section. problem.

4. Observe the degree of eccentricity of the core: Take a certain length of wire and observe whether the core is located in the middle of the insulation layer from the cross section; the misalignment of the core of the wire and cable manufacturer due to the production process is a certain degree of eccentricity. Eccentricity will cause the electric wire to be punctured by electricity when the amount of electricity and power is large.

5. Whether the wire mark is complete: According to the national standard requirements, the national standard wire will be marked with the manufacturer's name, model, specification, cross-sectional area, length, rated voltage, date of manufacture, certification number or certification mark every 20-50 cm. If the electric wires are not present or incomplete, it is recommended not to buy them to prevent property and personal injury during use.

电线电缆厂家

According to the national standard requirements, according to the different volumes of non-metal materials contained in each meter of the bundled cable, it is divided into three types of flame retardant grades A, B, and C.

At present, there are no detailed provisions in China that require the use of flame retardant grades for engineering cables. However, from a practical point of view, choosing a higher flame retardant grade is more advantageous in reducing the risk of fire and reducing failure losses. For the same type of cable, the higher the flame retardant level, the higher the price. The price difference between Class A and C flame retardant cables is about 15% -20%. Therefore, the selection of the cable flame retardant level in the project needs to consider comprehensively the cable quantity, laying density, fire probability, and safety requirements in the project.

For the selection of smoke density when the cable is burned: The national standard stipulates that the light transmittance in the cable burning experiment is more than 60%, which can be called low smoke; when the halogen acid content of the emitted gas is less than 5mg / g, it can be called halogen-free; the halogen acid content At 5-100 mg / g, it is low halogen.

However, it should be noted that in the cable burning experiment, only when the content of the halogen acid in the emitted gas is less than 5mg / g, the light transmittance of the low smoke product can reach 60%, and the light transmittance of the low halogen product is 30% -50 % Cannot meet the requirements of low smoke, so the statement of low-smoke and low-halogen flame-retardant cables is not standard. The exact statement should be low-smoke and halogen-free flame-retardant cables or low-halogen flame-retardant cables.

The outer sheath used for cross-linked polyethylene insulated flame-retardant cables is generally environmentally friendly materials such as halogen-free polyolefins or low-halogen polyvinyl chloride, which prevents the halogen acid gas released when the cable burns from causing harm to people.

For low-smoke halogen-free flame-retardant cables, the PH value, electrical conductivity, and light transmittance of the gas released when the outer sheath is burned are strictly required; for low-halogen flame-retardant cables, the acid gas content and Transmittance. For rail transit power supply systems such as urban viaducts, outer sheaths of low-halogen materials should be selected.


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Keywords: wire and cable manufacturers , Zhengzhou wire and cable , Henan wire and cable

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