4 Awg Solid Bare Copper Wire

Bare copper wires refer to copper wires of various specifications drawn from pure copper rods. The surface is not coated with any conductive or insulating materials such as coatings and varnishes. It is commonly known as bare copper wires. Bright and clean, the surface color is copper. In terms of physical properties, the bare copper wire is soft and has excellent electrical conductivity.

Bare copper wires can also be processed into various shapes according to needs, such as flat wires, round wires and various types of wires, etc., and can also be combined into various stranded wires and multi-stranded wires by combining multiple bare copper wires.

Bare copper wire has good electrical conductivity and physical and mechanical properties.

1. The conductivity of copper One of the most important characteristics of copper is its excellent conductivity, and its conductivity is 58m/(Ω.mm squared). This characteristic has led to copper being widely used in the electronics, electrical, telecommunications and electronics industries. This high conductivity of copper is related to the atomic structure: when multiple individual copper atoms are combined into a copper block, their valence electrons will no longer be confined to the copper atoms, so they can move freely in all solid copper , its conductivity is second only to silver. The international standard for the conductivity of copper is: the conductivity of a piece of copper with a length of 1m and a weight of 1g at 20°C is 100%. The current copper smelting technology can already produce the same grade of copper with a conductivity 4%~5% higher than this international standard.

2. Thermal conductivity of copper Another important effect of free electrons in solid copper is that it has extremely high thermal conductivity, with a thermal conductivity of 386W/(m.k), second only to silver. Therefore, it is made into various products such as wires and cables, connector terminals, busbars, lead frames, etc., and is widely used in electronic, electrical, telecommunications and electronic industries.

Copper also has key information on various heat exchange equipment such as heat exchangers, condensers, and radiators, and is widely used in power station auxiliary machines, air conditioners, refrigeration, automobile water tanks, solar collector grids, seawater desalination, and medicine, chemical industry , metallurgy and other heat exchange occasions.

1. Power system The wire and cable products used in the power system mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper cables (basically replaced by plastic power cables), rubber sheathed cables, and overhead insulated cables. ), branch cables (replacing some busbars), electromagnetic wires, and electrical equipment wires and cables for power equipment, etc.

2. Information transmission system The wires and cables used in the information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic wires, power communication or other composite cables, etc.

3. Mechanical equipment, instrumentation system This part is applicable to almost all products except overhead bare wires, but mainly power cables, electromagnetic wires, data cables, instrumentation cables, etc.

In terms of physical properties, the bare copper wire is soft, has excellent electrical conductivity and strong heat transfer capability.

The copper conductor has good ductility and good electrical conductivity. The metallic color of pure copper is purple-red. The melting point is about 1083.4°C, the boiling point is 2567°C, and the density is 8.92g/cm3. It has good ductility. 1g of pure copper can be drawn into 3000m thin copper wire or rolled into almost transparent copper foil with an area of ​​10m2.

The conductivity of pure copper is second only to silver, but it is much cheaper than silver, so more than half of the world's copper is used in the electric power and telecommunications industries.

Bare copper wires must be produced and inspected according to the standards of GB/T 3953 "Electrical Round Copper Wire" and GB/T 4909 "Test Methods for Bare Wires".

After the bare copper wire is produced, it must be packaged, stored, handled and transported in strict accordance with customer and industry standards to ensure that the product is free from moisture and damage.

Leoni, Hitachi, Sumitomo, Belden, Nexans, Hengtong Group, etc.

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