This paper introduces the standard and identification method of national standard cable. So, what kind of cable is produced in accordance with national standards? How to identify and distinguish different qualities of cable? What quality level does "enterprise standard/non-standard", "market national standard" and "resistance national standard" represent? Whether you are a wire and cable sales staff, or purchasing staff, I believe this article will help you.

So, what is the national standard cable?

The national standard cable, literally understood, is a wire and cable produced in accordance with national standards. China has clear regulations on the appearance, mechanical strength, insulation of the sheath, compressive strength and wire resistance of the cable. Different categories of cables have different national standards, mainly including the following:

Irradiation crosslinked power cable (0.6/1KV) Implementation standard: GB/T12706.1-2008

Medium voltage crosslinked cable (6/6KV-26/35KV) Implementation standard: GB/T12706.2-2008

High voltage crosslinked cable (64/110KV) implementation standard: GB/T 11017-[/B]2002

Control cable (450/750V) Implementation standard: GB9330-88

Aluminum strand and steel core aluminum strand (0.6/1KV) Implementation standard: GB/T 1179-1999

How to identify national standard cable?

1. Observe

First of all, to see whether there is a quality system certification; See whether the certificate is standard; See if there is a factory name, factory address, inspection seal, production date; See if the wire is printed with trademarks, specifications, voltage, etc. In addition, but also observe the cross section of the wire copper core, excellent copper color bright, soft color, otherwise it is defective.

2. Test

You can take a wire head and bend it repeatedly by hand, and anything with soft feel, good fatigue strength, large plastic or rubber feel elasticity and no cracks on the wire insulator is an excellent product.

3. 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 1.5mm² weighs 1.8 ~ 1.9 kg per 100 meters; 2.5mm² plastic insulated single strand copper core wire, weighing 3 ~ 3.1kg per 100 meters. Poor quality wire weight is insufficient, either the length is not enough, or the wire copper core impurities are too much.

4. Check the copper

Qualified copper wire copper core should be purple, shiny, soft. The shoddy copper core wire is purplish black, yellow or white, many impurities, poor mechanical strength, poor toughness, a little force will break, and the wire is often broken.

When checking, just peel off one end of the wire 2cm, and then rub a piece of white paper on the copper core slightly, if there is black material on the white paper, it means that there are more impurities in the copper core. In addition, the insulation layer of shoddy wire seems to be very thick, in fact, most of them are made of recycled plastic, and over time, the insulation layer will age and leak electricity.

5. Pay attention to price

Because of the low production cost of fake and shoddy wires, vendors often sell at low prices under the guise of cheap and good quality, so that people are fooled.

"Non-standard/enterprise/market national standard" and "resistance national standard"?

When many sales companies are asked whether it is a national standard cable, they often hear the words "market national standard" and "resistance national standard", and many people have little understanding of these issues. So what do these vague words really mean?

Resistance national standard: Wire and cable is used to power, and the resistance value of the conductor directly affects the conductive performance. If the conductor resistance is too large, the conductive performance is poor, and a large amount of heat will be generated when a large current passes through, which will cause a fire. At the same time, due to the large resistance will also generate heat and do nothing to consume electrical energy.

Resistance protection cable is to ensure that the resistance value of the cable is in line with national standards, but it does not guarantee that the composition of the cable is produced in full accordance with national standards, such as the square number of conductors, insulation, sheathing and so on. To put it bluntly, that is, manufacturers through a variety of technological innovation (or means) in the premise of reducing the cost of materials, so that the cable to achieve safe use conditions.

In recent years, there have been more and more fire accidents caused by unqualified wire and cable, and many of them are purchased unqualified products because of the lack of knowledge about cables.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.