BVR wire and cable

Special flexible wire for distribution cabinet. BVR wire is a special flexible wire for distribution cabinet, also called secondary wire. B refers to the distribution of wires, which is indicated by the letter B. V refers to PVC and PVC, also known as "plastic", R refers to soft. To be soft, it is necessary to increase the number of conductors. Copper core PVC insulated flexible wires are used. They are used in situations where soft wiring is required. It is deeply loved by electricians and building decoration personnel.

Application scope of BVR wire

This product is applicable to the fixed laying of power devices with AC rated voltage of 450/750V and below. Like home lighting. Fixed wiring can be used for indoor exposed laying, pipe laying and other occasions. In order to facilitate the difference during installation, it can be divided into seven colors: red, yellow, blue, green, black, white and double. Because BVR is a soft structure, its application range is mostly in soft environment.

Differences between BV and BVR

(1) In terms of production technology, BV is single-core and BVR is multi-core. In terms of production, BVR is a little more complex than BV. (2) In terms of price, BVR and BVR are more expensive than BV because they only focus on technology. According to the regulations of the International Electrotechnical Commission, BVR ranges from 2.5 mm to 70 mm. However, according to the actual needs of China, it is the same as BV. (3) In terms of performance, BV and BVR are basically the same, while BVR is slightly heavier in weight; Similarly, BVR wires can also be divided into flame-retardant wires, fire-resistant wires and low-smoke and halogen-free wires according to the selected materials. Users can flexibly master according to the situation of use. Among them, low-smoke and halogen-free (low-halogen) wires produce a very small amount of smoke under the condition of flame combustion. The gas released does not contain halogen (low-halogen) elements and is non-toxic (low-toxic). When a fire occurs, it can greatly reduce the harm to instruments, equipment and human body, so it is widely used in high-rise buildings, hospitals, large libraries, gymnasiums, disaster prevention command and control buildings, stations and civil airports, passenger waiting rooms, key cultural relics protection sites, subways, underground shopping malls or densely populated public places.

Precautions for purchasing BVR wires

1. Appearance: smooth and round, with uniform color, the insulating rubber and copper core are tight and not easy to peel off. The inferior rubber looks thick, but when pressed hard, the extruded part will turn white, which is easy to age and fall off in the future, causing electric leakage; 2. Eccentricity: the thickness of the rubber ring is the same, that is, whether the copper core is in the middle of the wire, the eccentricity is low; 3. Flame retardant: burn the rubber with a lighter. When the lighter leaves the wire, the wire should automatically extinguish and release a small amount of white smoke. If the flame spreads and releases a large amount of white smoke, it indicates that the rubber quality is not good; 4. Signs: whether there is a complete certificate of conformity, "CCC" sign, rated voltage, length, date, name and address of the factory and other complete information; 5. Thickness: the size of inferior copper core is often smaller than that of regular factory, and the thickness of outer insulation skin, the error of wire section diameter should not exceed 0.02%; 6. Length: the length of wire and cable products conforms to the national standard of 100 ± 0.5m (that is, taking 100m as the standard, the allowable error is 0.5m); 7. Weight: for the whole coil of wire (100 meters), 1.5 square meters shall not be less than 1871 grams, 2.5 square meters shall not be less than 2915 grams, 4 square meters shall not be less than 4312 grams, and 6 square millimeters shall not be less than 6107 grams.