Insulated wire refers to a type of wire that is wrapped in non-conductive insulating material. Typically, such wires have excellent insulation properties. In China, materials like resins, plastics, PVC, and silicone rubber are commonly used as non-conductive materials for wire insulation. These materials, when used to create the wire's insulating layer, prevent the conductive core from coming into contact with the outside, thereby avoiding issues like wire leakage and short circuits.
Main Applications of Insulating Wires
1. Plastic insulated wire
Its advantages include excellent insulation properties, simple manufacturing process, and lower cost. It can replace rubber insulation both in exposed and conduit installations, thereby saving a substantial amount of rubber and cotton yarn.
2. Chloroprene rubber insulated wire
Excellent oil resistance, resistant to mildew, non-flammable, good climate adaptability, slow photo-aging process, aging time about twice that of standard rubber-insulated wire, thus suitable for outdoor installation. Not recommended for conduit laying due to the lower mechanical strength of the insulation compared to standard rubber.
3. Overhead insulated wire
Its usage is increasingly widespread; it has excellent resistance to light aging and is mainly used in areas with high groundwater levels and to optimize the sites for liquid overflow from chemical corrosion. Particularly suitable for the reconstruction of urban distribution lines where the number of wires required is not many and it is inconvenient to bury them underground in the second factory area.
4. Adhesive Impregnated Low Insulation Power Cables
Permits higher operating temperatures, low medium loss, high voltage strength, long service life; its drawback is poor flexibility of the insulating material, which cannot be laid at low temperatures, otherwise it is prone to damage the insulation.
5. Polyvinyl Chloride (PVC) Insulated and Sheathed Power Cables (commonly referred to as Full-Plastic Wires or Plastic Wires)
Easy to process, no restrictions on laying gradients, lightweight, good bending properties, simple joint fabrication, resistant to oil, acid, and alkali corrosion, non-flammable, with internal armor structure, protecting steel strips or wires from corrosion, and affordable pricing.
6. Rubber Insulated Power Cables
Excellent bending properties, suitable for laying in extreme cold climates, particularly for horizontal and vertical laying conditions. It is not only suitable for fixed laying lines but also for those that are periodically moved.
7. Metal-clad mineral-insulated wire
High-temperature resistant; outer sheath made of copper or aluminum; insulation of magnesium oxide; suitable for steel industry, power plants, oil depots, high-rise buildings, nuclear power plants, oil rigs, cold storage, etc. Designed for AC rated voltage of 500V (DC voltage of 1000V) and below, in high-temperature, high-humidity, flammable, and explosive environments.

Insulation Wire Selection Tips
1. Genuine manufacturer and retailer products. Wires packaged in reels should have a certificate of conformity, and the wire itself should be marked with the manufacturer's name or logo, voltage, and 3C symbol, etc. Counterfeit and shoddy wires from manufacturers are often "three non-products," yet they may still bear ambiguous origin labels such as "Made in China," "Made in some province or city of China," etc., which essentially means the origin is not specified.
2. Copper wire is one of the conductor materials used for cloth wiring. When selecting, first choose the appropriate specification based on the load to be used, such as using 1.5 square millimeters of copper wire for lighting circuits, and 2.5 square millimeters of copper wire for air conditioners, microwaves, ovens, etc. Choosing the correct specification of wire can prevent short circuits and fires caused by insufficient current carrying capacity of smaller gauge wires.
Next, pay attention to the quality of the conductor. Qualified copper-core wires should be made of purple-red, glossy, and soft copper materials. On the other hand, inferior copper-core wires have purple-black cores, tend to be yellow or white, contain more impurities, have poor mechanical strength, and lack tenacity, often breaking with slight force. Moreover, multi-strand copper wires frequently have broken wires, resulting in a short lifespan.
3. The sheath used for cloth-covered wires is made of polyvinyl chloride insulation material. Qualified wire insulation should appear smooth with clear surface printing. Upon inspection from the wire end, the insulation should be even and not off-center. Some counterfeit wires may have a thick-looking insulation, but in reality, they are mostly made with recycled plastic. Over time, the insulation will age and cause leakage.
4. High-quality wires are generally within the specified weight range. In terms of pricing, due to the low production costs of counterfeit and substandard wires, vendors often use the guise of "good quality at a low price" to sell, leading consumers to be deceived.
Insulating wire, also known as cable, features primarily:
1. Space-saving, capable of accommodating multiple circuits in the same underground cable tunnel without interference, making it ideal for powering large factories and urban roads, enhancing both factory and city aesthetics.
2. High corrosion resistance; withstands harsh natural weather conditions (such as lightning, rain, salt fog, dirt, etc.) and surrounding environments, durable.
3. High reliability; cables are buried underground, offering higher safety and reliability in power supply compared to overhead lines.
4. Low maintenance costs for cable lines.

Insulated Wire Categories
1. Insulated wire categories include rubber-insulated conductors, polyvinyl chloride (PVC) insulated conductors, and rubber cables. This is a standard classification, but when detailed structure and application are considered, we typically divide them into fixed installation wires, insulated flexible wires, outdoor PVC insulated wires, copper-core PVC insulated installation wires, and agricultural direct-burial aluminum-core plastic-insulated plastic sheathed wires.
2. Moreover, knowing the type of insulating wire is not enough. In practical applications, we should have a clearer understanding of the AC voltage and working temperature suitable for each type of wire. For example, rubber-insulated wires have a working voltage of 500 volts and are allowed to operate at a long-term temperature below 65°C. Polyvinyl chloride (PVC) insulated wires have a normal working voltage of ≤450/750 volts, with a working temperature that cannot exceed 105°C.
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