In today’s wire and cable market, product quality levels are uneven, and production companies are mixed. Many Party A simply uses price as the procurement standard, which breeds a market for substandard products. So that when users are faced with different prices of “national standard cables”, they will be at a loss, not knowing how to identify and buy national standard cables. Today’s article mainly introduces the standards and identification of national standard cables. What kind of cables are produced in accordance with national standards? How to distinguish and distinguish cables of different qualities? What kind of quality is “enterprise standard/non-standard”, “market national standard” and “protected resistance national standard”? No matter you are selling cables , Or purchasing, I believe it will be helpful to you.
The national standard cable, literally understood, is the wire and cable produced in strict accordance with the national standard. my country has clear regulations on the appearance, mechanical strength, insulation of the sheath, pressure resistance, wire resistance and other aspects of the cable. Different types of cables have different national standards, mainly as follows:
Irradiation cross-linked power cable (0.6/1KV) executive standard: GB/T12706.1-2008
Medium voltage cross-linked cable (6/6KV-26/35KV) executive standard: GB/T12706.2-2008
High voltage cross-linked cable (64/110KV) executive standard: GB/T 11017-[/B]2002
Control cable (450/750V) executive standard: GB9330-88
Aluminum stranded wire and steel core aluminum stranded wire (0.6/1KV) executive standard: GB/T 1179-1999
How to identify the (ABC) SANS 1418 Standard
- It depends on
See if there is a quality system certification; see if the certificate is standardized; see if there is a factory name, site, inspection stamp, and date of production; see if there are trademarks, specifications, voltages, etc. printed on the wires. It also depends on the cross-section of the copper core of the wire. The high-quality copper is bright in color and soft in color, otherwise it is inferior.
It is recommended to bend a wire head repeatedly by hand. Anything with soft hand feeling, good fatigue resistance, elastic plastic or rubber hand feeling and no cracks on the wire insulator is the best product.
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 has a weight of 1.8~1.9 kg per 100 meters; a 2.5mm² plastic insulated single-strand copper core wire has a weight of 3~3.1 kg per 100 meters; poor quality The weight of the wire is insufficient, or the length is not enough, or the copper core of the wire is too much impurity
- Look at copper
The copper core of the qualified copper core wire should be purple-red, shiny, and soft to the touch.
The fake and inferior copper core wires are purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and will break with a little force, and there are often broken wires in the wires.
When checking, you only need to peel off the wire 2cm, and rub a piece of white paper on the copper core. If there are black substances on the white paper, it means that there are more impurities in the copper core. In addition, the insulating layer of fake wires seems to be very thick, but in fact, most of them are made of recycled plastics. Over time, the insulating layer will age and cause leakage.
- Look at the price.
Due to the low production cost of counterfeit and shoddy wires, vendors often sell them at low prices under the guise of low prices and good quality when selling.
“Non-standard/enterprise standard/market national standard” and “protected resistance national standard”?
When many sales companies are asked whether they are national standard cables, they often hear words like “market national standard” and “resistance protection national standard”. Many people have a little understanding. What do these vague words mean?
National standard for resistance protection: The cable is used to energize, and the resistance value of the conductor directly affects the conductivity. If the conductor resistance is too large, the conductivity will be poor, and a large amount of heat will be generated when a large current passes, which will cause a fire. At the same time, due to the large resistance, heat will be generated and the power will be consumed inaction.
The resistance-protected cable is to ensure that the resistance value of the cable is in compliance with the national standard, but it does not guarantee that the component materials of the cable are produced in full accordance with the national standard, such as the number of conductor squares, insulation, and sheath. To put it bluntly, it means that the manufacturer can achieve safe use of cables under the premise of reducing material costs through various technological innovations (or means).
Note that two words are used here: innovation and means. Innovation refers to reducing costs through technological innovation, such as current aluminum alloy conductors, special-shaped conductors, etc., such cables reduce the price on the premise of ensuring safe use. Some manufacturers use some illegal means to reduce costs, such as using second-generation materials, reducing conductor purity, etc. Even if the resistance value of such a cable is within the standard range, its use is extremely unsafe. The cable must be checked again and again.