The difference between national standard cable and non-standard cable
When selecting a cable, you should select the cable according to your site's usage. Don't be cheap. I think that the cable is cheap and can be guaranteed to be the national standard. Fudges are not professional and do not understand the users of the industry. In order to enable the majority of users to better understand the quality standards of cable and wire and self-judging the difference between national standard and non-standard. Below we combine the actual situation often encountered in engineering users and cable industry, let everyone make a simple understanding.
Cables and wires are commonly found in engineering users and construction projects. These three types of cables appear:
1. National standard cable: The cable produced according to the technology of the relevant cable standard issued by the state is referred to as the international line.
2. Marking cable: According to industry standards, there are mainly fewer cut corners, but it does not affect the large performance.
3. Non-standard cable: A product that is suitable for the needs of the city. Today, wire and cable applications are becoming more widespread, and as a result, there are more and more types of wire and cable sold on the market.
So, how do you distinguish between "national standard" and "non-standard" of wire and cable?
It is recommended that you have one look, two test, three weighing, four price, five copper, six quality testing, and six strokes.
A look: depends on whether the wire and cable products have a quality system certification, see if the certificate is standardized, see if there is a factory name, site, inspection chapter, production date, and see if the trademark, specifications, voltage, etc. are printed on the wire. Also look at the cross section of the copper core of the wire, the superior product copper color is bright, soft color, otherwise it is a defective product.
Two tests: It is advisable to take a wire head repeatedly and bend it by hand. Any soft touch, good fatigue resistance, strong plastic or rubber feel and no crack on the wire insulation are excellent products.
Three weighing weight: good quality wire and cable, generally within the specified weight range per 100m weight. Such as the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of 1.5mm2, 1.8-1.9kg per 100m weight; 2.5mm2 plastic insulated single-strand copper core wire, 3-3.1kg per 100m weight; 4.0mm2 plastic The insulated single-strand copper core wire has a weight of 4.4-4.6 kg per 100 m. Poor quality wires have insufficient weight, either insufficient length or excessive copper core impurities. If it is a cable, especially a large-size cable, the method of weighing the soil is the easiest way to best reflect whether the cable contains copper and the conductor cross-section. Generally, there is a cable that steals copper and makes a small cross-section. The amount of copper contained in the weight-free range that does not meet the allowable error of the state is basically recognized as non-standard.
Four-price ratio: Due to the low production cost of counterfeit and shoddy wires, when vendors sell, they often sell at low prices with low prices and good quality, which makes them fooled. Therefore, when buying, be careful, don't stun the mind for the "good quality and low price" advertised by the merchants, and eventually be deceived. Five look at copper. The copper core of the qualified copper core wire should be purple, shiny and soft to the touch.
Five look copper material: The copper core of the fake copper wire is purple black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, a little force will break, and there are often broken wires in the wire. When inspecting, you only need to peel off the wire for a while, then use a piece of white paper to slap it on the copper core. If there is black material on the white paper, it means that there are more impurities in the copper core, which can be regarded as "non-standard." "Wire and Cable.
Six quality inspection: In the case of differences in cable quality, it can be sent to a third-party testing agency for testing. Based on the eligibility of the authoritative test report.