Power cords are widely used in our daily life, especially in temporary wires and home decoration indoor wires. Recently, fires and electric shock accidents caused by the use of inferior wires have occurred frequently. How to identify the authenticity of the power cord?
The insulating layer of the wire is not made of high-quality insulating plastic but is made of recycled plastic. The insulating layer can be peeled off with a single peel, which is very likely to cause the insulating layer to be broken down by current and leak electricity, which is harmful to the life and property of the user. Security poses a great threat.
The DC resistance of the conductive core is unqualified. The thickness and pros and cons of the conductor of the wire determine the current load of the wire. If the core of the wire is made of inferior materials and the actual cross-section is much smaller than the specified specification, the long-term use will cause heat due to excessive conductor resistance and cause electrical fires. danger.
According to the actual situation, the method of identifying the power cord is introduced:
1. Look at the label. The content of the wire qualification certificate produced by regular manufacturers should include 3C certification mark, certification number, model specification, implementation standard, rated voltage, wire length, production date, manufacturer, inspector, factory name, factory address, fixed telephone, and anti-counterfeiting signs. Wait. The labels of counterfeit products are often unclear or incomplete.
2. Look at the surface. The plastic sheath of the regular wire is soft and smooth, and the color is uniform. On its surface, several items on the product certificate should also be printed, such as: 3C certification mark, certification number, model, rated voltage, implementation standard, factory name, etc. At the same time, the handwriting must be clear and not easy to erase.
3. Try bending. It is advisable to take a wire end and bend it repeatedly by hand. Those with soft hand feel, good fatigue resistance, plastic or rubber feel elastic and no cracks on the wire insulator are superior products. The insulation layer of fake and inferior wires seems to be very thick, but in fact, most of them are made of recycled plastic. As long as you squeeze a little harder, the squeezed place will become white, and the wire will break after 4 to 6 times of bending;
4. Tear off the insulation. High-quality insulating materials have certain mechanical strength and flexibility, and they cannot be easily torn apart. The inferior wire can be torn off or pinched off by hand;
5. Watch the burn. According to the regulations, the insulation layer of the wire has a certain flame retardancy. Peel off a section of the insulation layer and ignite it with a lighter. It is the inferior wire that can continue to spontaneously ignite after leaving the open flame.
6. Check the thickness. Cut a section of the insulating layer to see if there are visible pores on the section of the insulating layer and whether the core is located in the middle of the insulating layer. What is not centered is the eccentric phenomenon caused by the low craftsmanship, and the presence of pores indicates that the insulating material used is unqualified. Serious eccentricity is most likely to leak electricity on the thinner side, and the presence of pores also affects the compressive strength.
7. Look at the copper wire. The color of high-quality copper wire is bright and reddish, while the inferior copper core wire is purple-black, black, yellow, or white, and has a high hardness. For multi-strand flexible wires, touch the top of the copper wire with the palm of your hand, it should feel flat, without tingling, and feel soft. Otherwise, it is poor-quality wire.
8. Weigh. High-quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of BV 2.5 mm2 is 3.0 to 3.2 kg according to the weight of 100 m. The poor-quality wire is underweight.
