1. Mark of certificate of qualification

When purchasing cable, check whether the qualified card has "3C" certification mark, model and specification, rated voltage, length, manufacturing date, certification number, inspection, implementation standard, factory name, factory address and other marks are clear.

Pay attention to the packing

Pay attention to exquisite packaging, printing clear, model specifications, factory name, address, etc. Fake and inferior electric wire cable often is "3 have no product", but above have producing area to wait for fuzzy mark however, if China is made, China some provinces and cities is made, this is equal to to did not indicate producing area actually.

3. The appearance of the view

When buying, pay attention to the appearance should be smooth and round, uniform color, feel good. Such as rubber wire and cable, sheath, insulation materials can be used for cigarette combustion, and the surface is completely without damage.

Check the wire

The conductor must have a certain luster and moderate softness, and the resulting size must meet the requirements of the national standard. Copper core cable cross section, the better copper color is bright and soft, otherwise it is inferior.

Check the length of the

When choose and buy, must not covet price is cheap, when choose and buy only 90 meters or 80 meters, do not have the wire cable of length mark even, length must accord with 100(+/-) the standard requirement of 0.5 meters.

This is 2 try, try to be able to put the wire and cable end repeatedly bent by hand, always feel soft, good fatigue strength, plastic or rubber feel flexibility, crack no wire and cable insulation is a first-class article. The main methods are:

(1) according to weight

Good quality wire and cable, generally in the specified weight range. For example, the commonly used plastic insulated single-core copper wire has a cross-sectional area of 1.5mm2 and a weight of 1.8-1/100 m. 2.5mm2 plastic insulated single copper core wire, weighing 2.8-3.0kg per 100 meters; 4. 0 mm2 plastic insulated single copper core wire, weight 4.1 ~ 4.2 kg per 100 meters, etc. Poor quality wire and cable weight, or length is not enough, or wire and cable copper core impurities too much.

(2) try resilience

Qualified copper wire cable copper core should be purple, bright, soft feel. And the copper core of shoddy copper core for black, yellow or white, more impurities, poor mechanical strength, toughness is not good, a little strength will be broken, and often broken wire and cable phenomenon. During inspection, strip the wire and cable end by 2cm and wipe a piece of white paper on the copper core. If there is black material on the white paper, there are many impurities in the copper core. In addition, fake wire and cable insulation layer looks very thick, in fact, most of them are made of recycled plastic, poor toughness of production materials, poor resistance loss, easy to peel crack, a long time, the insulation layer will age and leak, leading to safety accidents.

(3) talk about the price

Because the production cost of fake wire and cable is low, so when the seller sells, often under the guise of good quality and low price, people fall into the trap.