What is bv cable

BV: Copper core PVC insulated wire is a kind of general purpose single-core hard conductor unshheathed cable, the executive standard is GB/T 5023.3-2008. It is made of copper conductor and PVC. It has the advantages of good conductivity and high melting point. It is the most conductive wire on the market at present.  Rated voltage: ≤ 1.5mm2, 300V/500V; ≥ 1.5m㎡ ; 450V/750V.  Conductor: 1 core, meeting the requirements specified in GB/T 3956-1997: type 1 for solid conductor; Type 2 for stranded conductors.  Insulation: PVC/C type PVC mixture.  Sign color: red, white, blue, green, black, gray, brown.  Sectional area: 0.5-1.0mm2 60227IEC05 BV; 1.5-240mm2 60227IEC01 BV。

Characteristics of bv cable

1. High durability.  In our home decoration, the external force on the cable is tensile force and working pressure, but in terms of compressive strength, a single copper wire is better. In the whole process of drawing and extrusion molding, the copper wire is easy to break, which will reduce the cable current carrying capacity of a very thin copper wire with a diameter of 0.41mm.    2. The cable has large current carrying capacity.  In short circuit, low frequency, low voltage and low current power supply circuits where skin effect is not considered, the cable ampacity of single copper core cable is greater than that of multi-core cable. If skin effect is fully considered, the cable ampacity of multi-core conductor will be greater. In fact, this is also the main reason why no single conductor in the cable exceeds 10mm.

Purpose of bv cable

BV wires are applicable to cables and wires for power devices, household appliances, instruments and telecommunication equipment with AC voltage of 450/750V and below. It has acid and alkali resistance, oil resistance, moisture resistance, mildew resistance and other characteristics. This part of mechanical equipment and instrument system is applied to almost all products except overhead bare wires, but mainly power cables, electromagnetic cables, data cables, instrument cables, etc. The wires and cables used by the information transmission system for the information transmission system mainly include local telephone cables, television cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic cables, power communication cables or other composite cables.  Service temperature: in normal use, the maximum temperature of conductor is 70 ℃.  Reference standards: GB 5023-2008, IEC60227.  Package specification: 100m, 500m, 1000m.

How to buy bv cable?

Buy bv wire mainly from two aspects: conductor and insulating layer. As long as these two parts are OK, it proves that they are good BV wires.  1、 Conductor.  Take out a piece of wire, peel off the insulation layer of the wire, and expose the copper wire inside - this is the conductor. We can judge the advantages and disadvantages of conductors from two perspectives:  1. Color.  Although they are all called "copper", they are not pure copper, which will contain impurities more or less. The more impurities contained, the worse the conductivity of the conductor. The amount of impurities contained in the conductor is generally reflected in the color.  High quality copper is called "red copper" or "red copper" - as the name implies, this kind of copper is red and purple in color, showing purplish red and dark red.  The worse the copper, the lighter the color, the more yellow, called "brass". Some copper is pale yellow - the impurity content of this copper is very high.  However, this is not bad. In the past few years, there was a kind of recycled rough copper, which was black on the whole and could not see red and yellow shadows (relatively rare in recent years). This kind of copper must not pass the national standard test. It belongs to fake and shoddy products and should never be bought.    2. Thickness.  We should look at the color first. We can judge which is better or worse by comparing the thickness of the same color. When the color conflicts with the thickness, we should first choose according to the color (for example, between the thinner red copper and the thicker brass, choose the red copper first).  At the same time, the thicker the wire, the stronger the conductivity - when comparing the thickness, only the conductor should be compared, and the thickness of the insulation layer should not be added.    2、 Insulation.  The rubber outside the wire is the insulation layer of the wire. Its existence can not only prevent external factors from causing damage to the conductor (protecting the conductor), but also protect the conductor from causing damage to the outside world (insulation, flame retardant) after its failure. Generally, the following three methods can be used to judge the insulation layer:  1. Touch.  Touch the surface of the insulation layer with your hand. If the surface is rough, it proves that the production process of the insulation layer is poor, and it is easy to cause leakage and other faults.  Press the insulation layer with a nail. If it can rebound quickly, it proves that the insulation layer has high thickness and good toughness.    2. Kink.  Take a section of wire, bend it back and forth for several times, and then straighten the wire for observation. If there is no trace on the wire surface, it proves that the wire has good toughness. If the wire surface has obvious indentation and serious whitening, it is proved that the wire toughness is poor. Buried underground for a long time, it is easy to age and become brittle, and it is easy to leak electricity in the future.    3. Burn.  Use a lighter to keep burning at the wire until the insulation layer of the wire catches fire. Then turn off the lighter and start timing - if the wire can be automatically extinguished within 5 seconds, it proves that the wire has good flame resistance. Otherwise, it is proved that the flame retardance of the wire is not up to the standard, and the circuit overload or circuit is easy to cause fire.