First, the meaning of BV, BLV and other symbols in wire and cable

Insulated wire (cloth wire) refers to the wire covered with insulation layer, including various connecting wires and installation wires.

L is the code for the aluminum core

R is the meaning of (soft), to be soft, is to add the number of conductors

BLV aluminum core PVC insulated wire

The above wire structure: conductor + insulation

The BV is available in 1 diameter 1.78mm and 7 diameter 0.68

The BVR is 19 pieces with a diameter of 0.41mm

It is softer than the BVR, still 2.5 and 49 0.25mm copper wires

That's one more plastic sheathing than the RV

BVVB copper core PVC insulated PVC sheathed flat cable, that is, 2 BV wires, in + a layer of white sheathed.

Second, what is the sheath line

Sheathed wire refers to a single core or multi-core wire with a sheathed layer, which is safer with sheathed. To put it bluntly, our most commonly used "sheath line" is a layer of white PVC sheath, which is covered with several BV lines. This kind of wire is generally a copper core wire, in addition to a layer of insulation outside the wire, there is a maintenance layer outside the wire. Commonly used sheath lines are RVV, BVV, RVVB, bvvb these types. Sheath line can be divided into hard sheath line and soft sheath line two kinds. According to the use of the environment and shape is divided into round sheath line and flat sheath line, round sheath line is generally multi-core, flat is generally single core.

Y---- polyethylene J---- crosslinked V---- polyvinyl chloride sheath

[Specification] ranging from 1.5 square to 240 square

[Copper] National standard oxygen-free copper (copper)

[Specification] This product is produced according to GB12706 "Additional voltage 35KV copper core, aluminum core plastic insulated power cable" specification, and can also be customized according to user needs.

[General extra voltage] (U0/U)0.6/1-- 26/35kv

1. The maximum additional temperature of the cable conductor shall be 90°C, and the maximum temperature of the cable conductor shall not exceed 250°C in case of short circuit (maximum duration shall not exceed 5S).

3. When laying, the zigzagging radius is allowed: the single-core cable is not less than 15 times the outer diameter of the cable; Multi-core cable not less than 10 times the outer diameter of the cable.

Third, what is YJV cable (YJV cable meaning)

[Full name] Cross-linked polyethylene insulated polyvinyl chloride sheathed power cable

Y---- polyethylene J---- crosslinked V---- polyvinyl chloride sheath

[core number] Single core, 2 core, 3 core, 4 core, 5 core, 3+1, 3+2, 4+1, etc

[Specification] ranging from 1.5 square to 240 square

[Color] Black

[Copper] National standard oxygen-free copper (copper)

【 Sheath 】 Polyvinyl chloride PVC

[Specification] This product is produced according to GB12706 "Additional voltage 35KV copper core, aluminum core plastic insulated power cable" specification, and can also be customized according to user needs.

[Usage] Suitable for indoor, cable trench, pipeline, tunnel, etc., can also be buried in loose soil, can not withstand external force, generally for the circuit transmission of the main road, extra voltage for power line transmission and distribution.

[General extra voltage] (U0/U)0.6/1-- 26/35kv

【 Usage characteristics 】

1. The maximum additional temperature of the cable conductor shall be 90°C, and the maximum temperature of the cable conductor shall not exceed 250°C in case of short circuit (maximum duration shall not exceed 5S).

2. The ambient temperature during cable laying should not be lower than 0°C

3. The allowable bending radius when laying: the single-core cable is not less than 15 times the outer diameter of the cable; Multi-core cable not less than 10 times the outer diameter of the cable.

Four, What is YC cable

YC rubber sheathed cable full name heavy general rubber sheathed flexible cable, is a kind of rubber sheathed cable. YC cable is suitable for communicating household appliances, power tools and various mobile electrical equipment or light mobile electrical equipment with an extra voltage below 450/750V, or for temporary construction on the site, and can accept large mechanical external forces. The long-term allowable working temperature of the core should not exceed 60℃. Y stands for rubber insulation and C stands for heavy-duty cable. The inner sheath is also rubber insulated, and the conductor is copper wire. Rubber cable is divided into heavy cable (yc cable), medium cable (yz cable) and light cable (YQ cable). The insulation layer of good YC cable is made of pure natural rubber, and the conductor is the excellent oxygen-free copper rod with excellent conductive function. At present, most products on the market are more or less unable to achieve this quality.

YC cable is mainly multi-core cable, commonly used 2 core, 3 core, 4 core, 5 core, copper core area of 0.75 to dozens of square.

Five, BV wire and cable knowledge

BV cable: copper core polyvinyl chloride insulated wire and cable, referred to as plastic copper wire, is the most commonly used wire and cable, but also our daily life in the most contact with a line.

Conductor data: oxygen free copper

Color: Black, yellow, blue, red, brown, white, etc

Extra voltage: 450/750V

Cable bend radius:

The outer diameter (D) of the cable is 25mm and above should not be less than 6D.

The mark of the cable (line) shall be performed in accordance with the GB6995 specification, and the mark shall be clear and erasable.

Product specification: GB5023.3-1997 JB8734-98 conforms to the IEC CCC specification, and the national standard bv cable production certificate must be printed with 3C certification mark.

What does WDKR-BYJ mean

BYJ: Copper core XLPE insulated cloth wire 450/750VWDWR-BYJ: copper core flame retardant halogen-free low smoke XLPE insulated cloth wire 450/750V and below building, electrical appliances, switches and other power equipment fixed wiring.

7. Explanation of cable model

R- Flexible cable (wire) for connection, soft construction.

B-flat (flat)

A- Tinned or silvered

P- Weaving shield

P22- Steel tape armouring

ZR - Flame retardant type

WDZ - halogen-free low smoke flame retardant type

2: The meaning of the common letters:

B: Flat, half, woven (woven), pump, cloth,(poly) styrene (vinyl),

The meaning of the cable universal symbol:

[2] Usefulness

P- Signal cable

(3) Insulation layer

Y-polyethylene

(4) Conductor. T- Copper core default indicates that L- aluminum core.

V-polyvinyl chloride

Q- Lead pack

H-rubber

LW- Corrugated aluminum sleeve

N-butyl rubber sheath

Viii. Wire and cable terms and terminology

According to GB/T2900.10-1984, wire and cable are defined as: wire products used to transmit electrical energy, information and complete the conversion of electromagnetic energy. In order to facilitate the selection and improve the applicability of products, China's wire and cable products can be divided into the following five categories according to their use.

2) Winding wire: in the way of winding in the magnetic field to cut the magnetic force line induction current, or through the current generated magnetic field wire, it is also known as electromagnetic wire, including a variety of characteristics of enameled wire, wrapped wire, inorganic insulated wire, etc.

4) Communication cables and communication optical cables: communication cables are cables that transmit telephone, telegraph, television, radio, data and other electrical information; Communication cable is based on optical fiber (fiber) as the light wave transmission medium for information transmission; Radio frequency cable is a cable for transmitting radio frequency signals in radio communications, broadcasting and related electronic equipment.

Wire and cable - wire products used to transmit electricity, information and complete the conversion of electromagnetic energy. Wechat public number: Build hydropower knowledge channel

Flexible cable - a cable that requires softness when used and can meet this requirement in terms of structure and data.

Single-core cable - a cable with only one insulated core.

Flat (multi-core) cable - Multiple insulated wires arranged in parallel to form a flat multi-core cable.

Bare wire - wire without insulation.

Twisted wire - A conductor consisting of a number of round or shaped wires in a spiral twist.

Enamelled wire - wire with a coating insulation (layer), primarily used as winding wire.

Non-dripping cable - Integral impregnated paper insulated cable where the impregnant does not flow at the highest continuous operating temperature.

Oil-filled cable - A self-contained pressure type cable that uses insulating oil as a pressurizing fluid and allows the oil to move freely in the cable.

Communication cables - Cables used to transmit electrical information, including local communication cables, long-distance communication cables, office cables and data communication cables.

Unit cable - A cable in which a number of wires are twisted or concentrically twisted to form a unit, and then a number of units are twisted to form a cable core.

Coaxial cable - Communication cable consisting of coaxial pairs.

Telephone cord - a soft wire used to connect telephone equipment.

Solid conductor (wire) - A conductor (wire) made of a round or shaped wire.

Metal-coated conductor - Each single wire is coated with a thin layer of a different metal or alloy.

Metal-clad conductor - A conductor consisting of an inner part of one metal and a wire coated with another metal as an outer part by metallurgical processing (welding).

Bundle conductor - A conductor composed of multiple single wires, in the same direction, at the same pitch, in a spiral shape.

Sector conductor - A type of conductor with an approximate sector shape.

Compacting conductor - A stranded conductor that reduces the stranded gap by mechanical compacting or stretching, or by choosing the shape and configuration of a single wire appropriately.

Insulation layer - the insulating material in a cable that has a specific function of resisting voltage.

Extruded insulation - generally composed of a layer of thermoplastic or thermosetting material extruded insulation.

Impregnated paper insulation - Wrap insulation made of impregnated insulating paper.

Plastic insulation - a dense layer or wrap of insulation made of plastic.

Shielding layer - The shielding layer that restricts the electromagnetic field within the cable or cable components and maintains the cable from external electric and magnetic fields. The shielding layer covering the cable is generally grounded.

Insulating shield - An electrical shield covering a metal or non-metal material over an insulating layer.

Main line core - the insulated wire core that assumes the primary function in wire and cable.

Symmetrical pair - A group of wires consisting of insulated cores of the same structure symmetrical to the longitudinal axis.

Filler - Material used in a multi-core cable to fill the gaps between individual insulated cores.

Barrier layer - A thin barrier layer used to prevent the harmful interaction between different components of the cable (such as conductor and insulation or insulation and sheath).

Metal sheathing - sheathing made of metal.

Non-metal sheathing - sheathing made of polymer material.

Outer sheath - The non-metal sheath that serves as the outermost sheath of a cable wrapped around a metal sheath.

Outer coating layer - a layer or layers of non-extruded cover on the outside of the cable.

Percentage conductivity - The ratio of the international code soft gauge resistivity (IACS) at 20 ° C to the resistivity of the data at the same temperature, expressed as a percentage and can be calculated by component or volume.

Conductor cross-section - The sum of the cross sections of the individual lines that make up a conductor perpendicular to the conductor axis.

Pitch diameter ratio - the ratio of the lay of the stranded element to its helix diameter.

Stranding constant - the ratio of the length of the component before stranding to the length of the finished part after stranding.

Weaving cover rate (weaving density) - the percentage of the surface area covered by the weaving material to the total surface area of the weaving layer.

Annealing - The continuous or non-continuous heat treatment of metal wire after cold working to reduce or eliminate the process of cold working hardening.

Bunching - The process of making bunching conductors.

Wrapping - The process of winding concentric cladding with strip.

Gap wrapping - When ribbon data is wrapping, the band edge is not connected with the adjacent band edge and a certain gap is left.

Cabling - The process of stranding (or wrapping) a cable core from a number of insulated wire cores (or metal sheathed wire cores) or unit wire groups and other components.

Cross-linking - The process of transforming a plastic from a linear structure to a spatial network structure by physical or chemical means.

Weaving - The process of weaving wire or nonmetallic fibers onto components such as conductors or insulators to create a network pattern.

Armouring - The process of covering an armouring layer over a cable.

Nine, YJV cable and VV cable three different

YJV cable and VV cable are fundamentally the same in function, but their differences are also obvious, and there are three main:

1. The name of the product is different, and the meaning is different: YJV cable insulation is crosslinked polyethylene, VV cable insulation is polyvinyl chloride.

2. There are also differences between the two kinds of lines in production equipment and process manufacturing:

VV is a plastic force cable, YJV is a cross-linked cable, and its insulation layer is better than the plastic force cable.

YJV only cross-linked the insulation material to improve the heat resistance temperature, while VV did not.

YJV cable operating temperature of 90 degrees, and VV only 70 degrees, the same cross-sectional YJV cable carrying capacity.

The maximum rated operating temperature of the VV cable conductor is 70 degrees Celsius, and the maximum temperature of the short circuit (duration less than 5 seconds) does not exceed 160 degrees Celsius.

YJV cable conductor working maximum rated temperature of 90 degrees Celsius, short circuit (duration less than 5 seconds) maximum temperature does not exceed 250 degrees Celsius.

YJV is better than VV in the long run (long service life, etc.), but more expensive than VV. From the maximum height allowed by the short circuit: YJV is 250 degrees, VV is 160, 140.

YJV application environment is worse than VV in waterproof, if it is buried laying, VV cable should be selected, it is necessary to ensure that the cable is waterless when selecting YJV, that is, to ensure that the cable trench (well) drainage is outstanding. If the cable bridge is laid, YJV is selected.

From the technical and economic indicators, the parameters of the three-core YJV are higher than those of the VV cable. It is recommended to use YJV in civil buildings, its carrying capacity is larger than that of VV, and more importantly, in electrical fires, because its insulation material does not contain chlorine, and will not produce toxic gases when burned. So that means that the environmental protection function of VV is worse. In the civil, nuclear power and other fields, VV has been fundamentally replaced by YJV, but in many industrial enterprises, VV is still widely used because of its cheap price.

Because YJV cable is better than VV cable in terms of cost performance, YJV cable has a trend of replacing VV cable.

10. What is BVV wire

BV wire full name copper core PVC insulated PVC sheathed round sheathed wire, also known as light PVC sheathed cable, commonly known as hard sheathed wire. Copper core (hard) cloth wire, single core is round, double core is flat. Often used for open wiring.

Letter B indicates wire, letter V indicates PVC molded correctly. There are also copper core symbols, hard wire (common single-core conductor) symbols omitted not indicated.

The difference between BVV and BV wire is that BVV has one more sheath than BV. Suitable for communication voltage 450/750V and below power equipment, household appliances, appearance and telecommunications equipment for cable and wire. The core allows the working temperature to not exceed +65 degrees for a long time. Its nominal section is 0.75 from 0.75 to 10 square; 1.0; 1.5; 2.5; 4; 6; 10; Seven norms. Suitable for communication voltage 450/750V and below power equipment, household appliances, appearance and telecommunications equipment for cable and wire.