Control Wire

The control wire is like other wires, made of copper conductor, insulation material, and outer sheath. The conductor is usually single or multi-strand copper. Insulation and outer sheath material are usually PVC. Control electric wire is suitable for industrial, mining enterprises, and the energy transport sector.

Control Wire characteristic

• DC Resistance: 20℃, 0.4mm wire, ≤148Ω/km, 0.5mm wire, ≤95Ω/km.
• Insulation electric strength: 1min 1kv between conductors without breakdown Conductor and shield 1min 3kv without breakdown.
• Insulation resistance: Each core wire is grounded with the other cores, the control wire is greater than 10000MΩ.km, and the HYAT wire is greater than 3000MΩ.km.
• Working capacitance: Average value 52±2nF/km.
• Far-end crosstalk defense: The average power of the specified combination is greater than 69dB/km at 50kHZ.

Many people may feel confused about the power cable and control copper wire, this is the third topic of this article.

Cables are an essential part of any industrial application. Ensuring the cables are properly protected in various industrial environments is also critical, and the first line of defense is the cable jacket. The cable jacket is the outermost layer of a cable that protects the insulation and conductor from external damage. Choosing the appropriate cable jacket material for the environment, especially where chemical cleaning solutions, cutting fluids, and other caustic liquids are present, will increase cable lifespan and increase overall uptime.

Comparing Cable Jacket Materials
Two common types of cable jacket materials used in industrial applications are PVC and PUR. Both of these materials are flexible and durable thermoplastics, materials which melt at extremely high temperatures and become solid again when cooled. Even though they are both plastics, their differing physical properties imbues them with unique abilities. These abilities make PVC cables and PUR cables suited for use in different types of environments.

Polyvinyl chloride, or PVC, is a widely used, general-purpose cable jacket material due to its versatility and low cost. PVC cables can resist heat, oils, moisture, and abrasions, but are especially resistant to common cleaning chemicals. Polyurethane, known as PUR, is also good for oil, moisture, and abrasion resistance, but does not have the same heat resistance qualities as PVC. However, PUR cables are stronger and more flexible.

PVC Cables and When to Use Them
PVC cable jackets are inherently flame- and heat-resistant, owing to their chemical makeup. They can also resist oils, acids, abrasions, sunlight, salt water, ozone, oxidation, and moisture, and a PVC cable with an IP69K rating means it is sealed against the ingress of water even during washdown. This makes them an excellent choice for most chemical washdown applications in the food industry and beverage industry. Because PVC is a blend of materials and can vary from manufacturer to manufacturer, its properties can be adjusted and tailored for specific applications and conditions.

When choosing a cable jacket material, it is also important to consider the concentration of chemicals, temperature of the process, and the duration and frequency of exposure since these factors can impact the suitability of PVC for these applications. For example, though PVC has some resistance to oils, other materials such as PUR offer improved oil resistance, making PVC less suited for automotive and machine tool industries.

In addition to cleaning chemical resistance, PVC cables are typically more rigid than other types of cables. This makes them suitable for use in applications where they will be exposed to high temperature, high pressure washdown. The rigidity of the PVC sheathing protects the cable from damage and extends the life of the cable. However, the rigidity of PVC cables can be a disadvantage in freezer applications, where low temperatures can cause the material to crack if the cables are being flexed.

PUR Cables and When to Use Them
Like PVC, PUR is a thermoplastic material used for cable jackets. However, the chemical composition of polyurethane is noticeably different than that of polyvinyl chloride. Despite not having the natural fire resistance of PVC, PUR does not contain halogens like PVC does and will not emit toxic fumes if exposed to fire. It also creates little smoke. This makes PUR the preferred material in the European Union because EU regulations required "low/no smoke, low/no halogen" properties to be identified on the cable jacket. In case of an incident, fewer halogens will be released into the air.

PUR cables have a high tensile strength and are resistant to UV light, water, tears, and abrasions. They are also resistant to weld slag, cutting fluids, oils, solvents, and other harsh chemicals, making them a good choice for many automotive manufacturing, stamping, and machining applications.

One standout feature of PUR cables is their flexibility and small bend radius. This makes them ideal for applications where connections move or bend frequently, such as robotic applications. Many PUR cables can maintain flexibility even in low temperatures. Besides robotics, PUR cables’ flexibility lends itself to use in paint facilities, medical applications, and other applications with constant movement.

Fire resistant cable refers to a cable that can remain operational for a certain period of time when burned. Can maintain circuit integrity in case of fire. It has copper as a conductor, a seamless copper tube as cover and magnesium oxide inorganic mineral as insulation.

Unlike fireproof cables, there is no criterion of combustion or prolonged non-combustion of the cable itself. Instead, the flame retardant cable quickly aborts its work in case of fire. Its main function is that it is difficult to burn and can be self-extinguishing..

Insulation Resistance of Fire Resistant Cable
The insulation resistance of fire-rated cables is highly dependent on the amount of moisture in the magnesium oxide. under standard conditions, when the moisture content does not exceed the 0,4%. The insulation resistance of pressed magnesium oxide is higher than that of other insulating materials (for example, PVC, PE, XLPE, etc.). It can reach from 10Ψ/m to 1016Ψ/m at 20°C.

Besides, the insulation resistance of a cable is related to the number of cores and the size of the cross section. The greater the number of cores and the cross section, the lower the insulation resistance. At the same time, the insulation resistance also depends on the number of impurities in the magnesium oxide. It is also related to temperature, the higher the temperature, the lower the insulation resistance of the cable.

Electrical Resistance of Fire Resistant Cable
Compared to other insulating materials used in the cable industry, the electrical resistance of cables finished with magnesium oxide insulation is not as high. The electrical resistance of fire resistant cables depends on the density of magnesium oxide. Besides, the thickness of the insulation and the condition of the cable itself affect the electrical resistance.

For example, if a cable suffers a bend, the density of the insulating material in the curve decreases. In severe cases, it can even crack. This leads to a reduction in the electrical resistance of the cable.. Tests have shown that at a temperature of 20°C. at a frequency of 50 Hz, The electrical resistance of an unbent standard-density wire approaches 6,0 MV/m. The resistance of the wire is approx. 3 MV/m when the radius of curvature is 6 times the diameter of the cable.

Heat Resistance of Cables
The heat resistance of fire-resistant cables depends on the permissible working temperature of the core and sheath during operation. Under normal conditions, neither the electrical conductor nor the cover rusts. Due to the low oxygen content in the cable insulation, oxidation is not serious. Nevertheless, the cover of the electrical fire resistant cables can oxidize violently due to exposure to air. The higher the temperature, the more serious the oxidation. When the temperature of the copper sheath of the cable exceeds 250°C, drastic oxidation begins to occur, forming the oxide layer CuO.

The company is now located in Xintaizi Industrial Park, Liaoning Province, covering an area of nearly 150 acres, the factory area more than 50 acres. The company is mainly committed to research & development and production of flexible mineral insulated fireproof cables, mica belt mineral insulated corrugated copper sheathed cables, and new high conductivity 8000 series of anti-pressure and creep-resistant aluminum alloy core interlocking armored power cables, as well as halogen-free low-smoke flame retardant cables and ordinary wire and cable and other full range of full-specification high-quality cable products system research and development, design, manufacturing, marketing and service. Pengcheng products are widely used in smart grid, energy power, green building, smart factory and hospital and other fields. Currently has a number of valid patents.