Wires and cables are special commodities that affect the lives and property of thousands of households and the normal operation of all industries.
They are used in a wide range of applications, especially for temporary use and indoor use in home renovations.
Generally speaking, the identification of cables on the market is based on the labels, logos, and 3C marks on the product or packaging.
However, when users purchase wire and cable, many of them have 3C marks on their products or packaging, even though their quality is questionable.
Therefore, it is difficult to distinguish the authenticity for a moment, and in such cases, you cannot easily trust it.
This is because if you use counterfeit or shoddy wire and cable, it may cause a short circuit or electric shock in light cases, or it may cause a fire in heavy cases, resulting in injury or death.
Today let the ZMS cable editor take you to learn some ways to distinguish between genuine and counterfeit high-quality inferior cables.
Poor Quality Cable Hazards
According to the introduction, inferior quality electric cables have great hazards.
1 Low Safety Performance
There are many wire insulation layer that is not made of regular insulation plastic but made of recycled plastic.
In this case, a light peel will be able to peel the insulation layer, it is easy to cause the insulation layer by the current through the leakage, and the user’s life safety poses a great threat.
2 Conductor Thickness Standard Error
The cable conductor determines the amount of current load on the wire.
The greater the current, the thicker the conductive core is required.
The inspection found that the actual cross-sectional size of many wire cores is much smaller than its stated size.
For example, many wires claim to have a core cross-section of 4 square millimeters, measured down to only 2.5 square millimeters.
Some are even only 1.5 square millimeters.
When consumers use such products, will cause excessive heat resistance, causing the risk of an electrical fire.
Shoddy Wire Characteristics
1 Cable Length is not Enough
The main hand used by the illegal factory is to make a stamp on the length of the wire and cable.
The actual length of the wire and cable is smaller than the standard length, and the billing is performed following the standard length.
The most typical example is cloth and wire packaged in rolls.
The national standard stipulates that for each roll of 100 meters of cloth and wire, the measurement error should be no more than 0.5%.
This means that the length of each roll of wire is 100 ± 0.5 meters.
The actual length is only about 80 m. Many factories are blatantly marked 100 ± 20 m on the qualified card. If the selling price is converted into meters, it is not cheap.
This type of scam is easier to identify
1.1 Look at the conformity card
1.2 Sampling length
Because cloth wires are relatively soft, they are easy to measure.
2 Resistance Value does not Meet the Standard
Wires with excessive resistance values may be too hot at the same current, thereby accelerating the cyclization of the outer insulation layer and leading to short circuits and fires.
In addition, excessive resistance also greatly increases the energy consumption of the power transmission process and increases the cost of electricity.
3 Defective Raw Material Materials
Unscrupulous factories will cheat on copper conductors. This is because copper conductors account for 80% of the cost of electric wires.
3.1 Reducing the Quality of Copper
The use of much less expensive copper impurities, recycled copper, or even the refining of copper by organic methods.
This copper content is highly unstable and leads to a significant increase in the resistance of copper conductors.
3.2 Reducing The Amount of Copper Used
The actual cross-sectional area of the copper core is also reduced.
The direct result of these two practices is that the wire overheats during use, damaging the plastic insulation layer And causing a fire by short-circuiting.
The second tactic is to be careful with the plastic used for the insulation.
With the same degraded quality as copper, there is a price difference of nearly $2,000 per ton between reinsulating material and qualified PVC plastic powder.
However, the high impurity content and low mechanical strength of the reinsulating material reduce the resistance to corrosion and electrical insulation properties.
This practice will directly lead to the wire leakage phenomenon.
Identification of Shoddy Wires
1 Look at the Label
The content of the certificate of conformity of the electric wire produced by the regular factory should include the following
1.13C certification mark
1.2 Certification number, model specifications
1.3 Enforcement standards, rated voltage
1.4 length of the wire, the date of production
In addition to the producer, the inspector, factory name, factory address, landline telephone, and anti-counterfeiting label.
The labels of counterfeit products are often not printed properly or the printed content is incomplete.
2 Look at the Surface
The plastic leather of genuine wires is soft and smooth, with a uniform color.
On its surface, it should also be printed with several items on the product certificate of conformity.
For example 3C certification mark, certification number, model number, rated voltage, enforcement standard, etc.
At the same time, the handwriting must be clear and not easily erased.
3 Test bending
Take a wire and bend it repeatedly by hand.
Any wire that feels soft has good fatigue strength, feels flexible in plastic or rubber, and has no cracks in the insulator is a superior product.
The insulation of counterfeit wires may look thick, but in fact, most of them are made of recycled plastic.
If the cable is squeezed with force, the extrusion will become white and the wire will be broken after bending it four to six times.
4 Tearing the Insulation
High-quality insulation has a certain mechanical strength and flexibility, and cannot be easily torn.
Inferior wire can be torn off or pinched off with your hands.
5 Look for Burning
The insulation of the wire is required to have a certain level of flame resistance.
Peel off a section of insulation and ignite it with a fire extinguisher; a wire that continues to burn itself after leaving a fire is of inferior quality.
6 Checking Thickness
Cut off a section of insulation to see if there are gas holes visible to the naked eye on the cross-section of the insulation and if the core of the wire is located in the middle of the insulation.
If the core is not in the middle, the core is off because of poor workmanship.
If there are air holes, the insulation used is substandard.
If the core is seriously off-center, it is most likely to leak on the thinner side, and the presence of air holes also affects the voltage strength.
7 Look at the Copper Wire
The color of high-quality copper wire is bright red.
Poor quality copper core wire is purple and yellowish, blackish, yellowish, or white.
Hardness is greater, with more impurities, poor mechanical strength, poor toughness, and a little force that will break.
The wire is often broken.
For multi-stranded soft wires, lightly touch the tip of the copper wire with your palm.
The wire should feel flat, not tingly, and relatively soft. Otherwise, the wire is of inferior quality.
8 Look at the Price
The production cost of counterfeit wires is low.
Therefore, vendors often sell them under the guise of good quality at low prices, making me fall for them.
According to the above simple verification method, you can identify whether it is a superior or inferior wire. If you need to speak with data, test the length, diameter, thickness, resistance, voltage resistance, and strength of the wire with the appropriate equipment.
These are the main methods of how identifying poor-quality cables.
Wires and cables are the main carriers of power transmission, and their use is extremely widespread, and they are used in numerous major renovation and new construction projects.
So you must choose the cable to shine your eyes and identify the authenticity.
ZMS cable company has always been concerned about the development of the cable, always adheres to providing high-quality cable, good value for money, considerate service, the product after a strict manual qualification audit, trustworthy.