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Practical skills to identify the advantages and disadvantages of power cables

Ordinary insulated wires are widely used in our daily lives, especially for temporary wires and indoor wires for home decoration. Recently, fires and electric shock accidents caused by the use of inferior wires have occurred. The production of shoddy wires is mainly reflected in:
1. The wire insulation layer is not made of high-quality insulating plastic, but made of recycled plastic. The insulation layer can be peeled off with a slight peel, which can easily cause the insulation layer to be broken down by current and leak current, which is harmful to the user. The safety of life and property poses a great threat.
2. The DC resistance of the conductive core is unqualified. The thickness and quality of the wire conductor determine the load of the wire to the current. If the core of the wire is made of inferior materials and the actual cross-section is much smaller than the specified specifications, long-term use will cause heat due to excessive conductor resistance and cause electrical fires. danger.
3. Look at the label. The content of the wire certificate produced by a regular manufacturer should include: 3C certification mark, certification number, model specification, implementation standard, rated voltage, wire length, production date, producer, inspector, factory name, factory address, fixed telephone, anti-counterfeiting label Wait. The labels of counterfeit products are often unclear or incomplete.
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4. Look at the surface. The plastic sheath of the regular wire is soft and smooth, and the color is uniform. On its surface, there should also be several items printed on the product certificate, such as: 3C certification mark, certification number, model, rated voltage, executive standard, factory name, etc. At the same time, the handwriting must be clear and not easy to erase.
5. Try to bend. It is recommended to bend a wire head repeatedly by hand. Anything with soft hand feeling, good fatigue strength, plastic or rubber hand feeling and elasticity and no cracks on the wire insulator is the best product. The insulation layer of fake wires seems to be very thick, but in fact, most of them are made of recycled plastics. As long as you squeeze a little harder, the squeezed part will become white, and the wire will be broken after 4 to 6 times of bending;
6. Tear the insulation. High-quality insulating materials have a certain degree of mechanical strength and flexibility, and cannot be easily torn apart. Inferior wires can be torn off or pinched off by hand;
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7. Look at the burning. According to regulations, the insulation layer of the wire has a certain flame retardancy. Peel off a section of the insulating layer and ignite it with a lighter. It is a poor quality wire that continues to spontaneously burn after leaving the open flame.
8. Check the thickness. Cut a section of the insulating layer to see if there are visible pores in the section of the insulating layer, and whether the core is located in the middle of the insulating layer. What is not in the center is the eccentricity caused by the low craftsmanship. The presence of pores indicates that the insulating material used is unqualified. Severe eccentricity is most likely to leak on the thinner side, and the presence of pores also affects the compressive strength.
According to the above 8 simple verification methods, it can basically identify whether it is a good or bad wire. If you need to use data to speak, please use the corresponding instrument to detect the length, diameter, thickness, resistance, voltage resistance, and strength of the wire.

by huaxingconductor | 2021-07-05 11:56 | Comments(0)

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by huaxingconductor