National Standard And Non-standard Of Cable

When selecting cables, you should select cables according to your own site use, and don't be greedy for cheapness. In order to enable the majority of users to more clearly understand the quality standard of cables and wires and self judge the difference between national standard and non-standard. Let's give you a brief understanding of the actual situation often encountered by engineering users and the cable industry.

Cables and wires are generally used in engineering users and construction projects. These three kinds of cables mainly appear:

1. National standard cable: the cable produced according to the technology of relevant cable standards issued by the state is referred to as international cable for short.

2. Line standard cable: according to industry standards, there are less Jerry built cables, but it does not affect the performance of large cables.

3. Non standard cable: a product born to meet the needs of the city. Nowadays, the application of wires and cables is more and more extensive. With this, there are more and more kinds of wires and cables sold in the market.

So, how to distinguish between "national standard" and "non-standard" of wires and cables?

It is recommended that you have a look, two tests, three weighing, four price comparisons, five copper, six quality tests and six moves.

First look: it depends on whether the wire and cable products have quality system certification, whether the certificate is standardized, whether there is factory name, address, inspection seal and production date, and whether the wire is printed with trademark, specification, voltage, etc. It also depends on the cross section of the copper core of the wire. The superior red copper has bright color and soft color, otherwise it will be defective.

Second test: a wire head can be bent repeatedly by hand. Those with soft hand feeling, good fatigue resistance, large hand elasticity of plastic or rubber and no cracks on the wire insulator are excellent products.

Three weights: for high-quality wires and cables, the weight per 100m is 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 1.8-1.9kg per 100m; 2.5mm2 plastic insulated single strand copper core wire, with a weight of 3-3.1kg per 100m; 4.0mm2 plastic insulated single strand copper core wire, with a weight of 4.4-4.6kg per 100m, etc. The wire with poor quality has insufficient weight, or insufficient length, or too many impurities in the copper core of the wire. If it is a cable, especially a large-size cable, the method of weighing is * * * a simple method that can reflect whether the copper content of the cable meets the standard and whether the conductor section is up to the standard. Generally, there are cables with small cross-section by stealing copper. If the copper content of the cable cannot reach the weight range of the allowable error specified by the state after weighing, it can be basically recognized as non-standard.

Four price comparison: because the production cost of fake and shoddy wires is low, vendors often sell at low prices under the guise of low price and good quality. Therefore, when buying, be careful not to be confused by the "high quality and low price" advertised by the merchant, and * * * will eventually be deceived. Five, look at copper. The copper core of qualified copper core wire shall be purplish red, shiny and soft.

Fifth, look at the copper material: fake and shoddy copper core wire. The copper core is purplish black, yellowish or white, with many impurities, poor mechanical strength and poor toughness. It will break with a little force, and there are often wire breaks in the wire. During the inspection, you just peel off one end of the wire, and then rub it on the copper core with a piece of white paper. If there are black substances on the white paper, it indicates that there are many impurities in the copper core, which can be identified as "non-standard" wires and cables.

Vi. quality inspection: in case of differences in cable quality, it can be sent to a third-party inspection organization for inspection. Based on whether the authoritative test report is qualified.