How to identify the quality of wire and cable?

As the carrier of power transmission, the quality of wire and cable has become an influencing factor for the frequency of fires. Therefore, to avoid the occurrence of family fires or engineering fires, so as not to worry about yourself, you need to choose high-quality wires and cables to create awareness of safe electricity use and create a safe and healthy life. So, how to judge the pros and cons of wire and cable?

Judging by brand

The layman’s best way of judging, of course, is by brand identity. Big brands, good reputation, and more reliable quality. So when purchasing, it is best to choose brand products with a good reputation. Compared with small brands, big brands cherish their brand image and brand value more, and pay more attention to quality and service.

Judging by product packaging

When purchasing, you need to check to see if there is a quality system certification, to see if the certificate is standardized, to see if there is a factory name, factory address, inspection stamp, production date, and to see if there are trademarks, specifications, voltages, etc. printed on the wires. Fake and shoddy wires are often “three no products”, but there are also ambiguous signs of origin on them.


Judging by product quality

  1. Weighing: Good 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 1.5 mm² weighs 1.8~1.9 kg per 100m; the plastic insulated single-strand copper core wire of 2.5 mm² weighs 2.8~3.0kg per 100 m; Plastic insulated single-strand copper core wire, the weight per 100 m is 4.1~4.2kg, etc. Poor quality wires are not enough in weight, or the length is not enough, or there are too many impurities in the copper core of the wire.
  2. Burn it with fire, and the one that goes out within 5s after leaving, and the one with certain flame retardant function is the national standard line.
  3. Look at the insulating rubber: the insulating layer of fake and inferior wires seems to be very thick, but in fact most of them are made of recycled plastics. As long as you squeeze it a little harder, the squeezed part will turn white and powder will fall off. , the insulating layer will age and leak electricity.

Conductor material

Qualified copper core wire copper core should be fuchsia, shiny, and soft to the touch. The copper core of fake and inferior copper core wires is purple-black, yellowish or white, with many impurities, poor mechanical strength, and poor toughness. It will break with a little force, and there are often disconnections in the wire. When checking, you only need to peel off the wire 50px at one end, and then use a piece of white paper to rub it on the copper core. If there is black substance on the white paper, it means that there are more impurities in the copper core.


Measuring strength

It is advisable to bend a wire head repeatedly by hand. Those with soft hand feeling, good fatigue resistance, high elasticity of plastic or rubber and no cracks on the wire insulator are superior products. Such as: Sichuan tower brand cable; can refer to;

Measuring thickness

National standard wires of 1.5 to 6 square meters require a skin thickness of 0.7mm. If it is too thick, it may be non-national standard, and its inner core may not be enough.


Measuring eccentricity

Cut off a section of insulating layer to see if its core is in the middle of the insulating layer. What is not in the center is the eccentric phenomenon caused by the low-tech process. If the power is low during use, it can be safe. Once the power consumption is large, the thinner side is likely to be broken down by the current

Measuring length

The relevant standards stipulate that the error of the length of the wire cannot exceed 5%, the national standard line is 100 meters, and the error is within ±0.5 meters.