Fairies buy bags, handsome guys buy shoes; the styles are diverse and dazzling; it is difficult to distinguish the real from the fake; in a blink of an eye, the banknotes are gone.
The article is written here, do you think the editor is going to stray from the topic
How is it possible, the editor who has both civil and military skills, beauty and wisdom beside the point?!! It does not exist!!!
The choice of wires and cables is actually similar to buying bags and shoes.
There are more and more types of wires and cables on the market and more and more applications.
If you are not careful, you will buy bags that are not suitable for you.
Unsuitable wire and cable.
Xiaobian here has a little trick to distinguish between "national standard" and "non-standard", what are you waiting for?
Q1 The difference between "national standard" and "non-standard" wire and cable!
1. Non-standard wires refer to special-purpose cables and wires that do not belong to the specifications and performances specified by national standards. Non-standard wires are made of cheap second-generation sheath materials. The inferior ones generally have pores and trachoma, the color is dark and unclear, and the thickness is not up to standard.
2. The national standard wire, that is, the wire produced in full accordance with the national standard. General household and common wires are in line with standard specifications and performance, and the national standard stipulates five common specifications and performances. The national standard wire is soft to the touch, has good fatigue resistance, plastic or rubber feels elastic and has no cracks on the wire insulator. The national standard line superior product is 100± 0.5 meters/roll.
Q2 How to distinguish between "national standard" and "non-standard" wire and cable?
Take a look
See if there is a quality system certification;
See if the certificate is standardized;
See if there is factory name, factory address, inspection stamp, production date;
Check whether the wire is printed with trademark, specification, voltage, etc.;
It also depends on the cross section of the copper core of the wire.
Generally speaking, the first-class copper is bright in color and soft in color, otherwise it is a defective product.
It is advisable to take a wire end and bend it repeatedly by hand. Those with soft hand feel, good fatigue resistance, plastic or rubber feel elastic and no cracks on the wire insulator are superior products.
The weight and quality of the wire and cable are generally within the specified weight range per 100m.
For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of 15mm2 weighs 1.8-1.9kg per 100m; 2.5mm plastic-insulated single-strand copper core wire has a weight of 3-3.1kg per 100m; The plastic insulated single-strand copper core wire of mm2 has a weight of 4.4-4.6kg per 100m, etc.
The poor quality wire and cable is insufficient in weight, or the length is not enough, or the wire copper core has too much impurities.
The price of four ratios
Due to the low production cost of counterfeit and shoddy wires, traders often sell them at low prices under the guise of low prices and good quality, which makes people fooled.
Therefore, be careful when buying, and don't be fooled by the "good quality and low price" advertised by the merchants.
Five look at copper
Qualified copper core wire copper core should be purple, shiny and soft to the touch.
However, the copper core of the fake and inferior copper core wire is purple-black, yellowish or white, with many impurities, poor mechanical strength and poor toughness.
When inspecting, you only need to peel off one end of the wire and rub it on the copper core with a piece of white paper. If there is black material on the white paper, it means that there are more impurities in the copper core, and it can be identified as "Non-standard" wire and cable.