Zhongtian Optical Cable How to choose cables?

　　Cables are products used to transmit electrical (or magnetic) energy, signals, and to facilitate the conversion of electromagnetic energy. They typically consist of a conductor, an insulating layer, and a protective sheath, and include bare conductors, power cables, communication cables and optical fibers, wires and cables for electrical equipment, overhead insulated cables, and special-purpose cables. Each category encompasses numerous types and specifications. So how should we choose among such a wide variety of cable products when making a purchase? The editors at Zhongtian Optical Cable will offer guidance from three perspectives on how to select the right cable!

　　I. Selection Based on Cable Model

　　The editors at Zhongtian Optical Cable recommend that, when selecting cables, you should consider their intended application, installation conditions, safety requirements, and other factors.

　　The editors of Zhongtian Optical Cable recommend selecting power cables, overhead insulated cables, and control cables based on the specific application.

　　The editor of Zhongtian Optical Cable recommends that, depending on the installation conditions, one can generally choose from plastic-insulated cables, steel-armored cables, and corrosion-resistant cables.

　　It is recommended that, in accordance with safety requirements, flame-retardant cables, halogen-free flame-retardant cables, and fire-resistant cables be selected.

　　II. Select According to Specifications

　　1. When determining the service specifications (conductor cross-sectional area) for wires and cables, factors such as heat generation, voltage drop, economic current density, and mechanical strength must be taken into account. Based on experience, since low-voltage power distribution lines typically carry relatively large load currents, the cross-sectional area is generally selected according to the heating requirements, followed by verification of voltage drop and mechanical strength.

　　2. For low-voltage lighting circuits, given the stringent voltage-level requirements, the conductor cross-sectional area may first be selected based on the permissible voltage drop, followed by verification of thermal heating and mechanical strength.

　　3. For high-voltage lines, first select the conductor cross-section based on the economic current density, and then verify its heating conditions and permissible voltage drop.

　　4. For high-voltage overhead lines, mechanical strength shall also be inspected; if the user lacks experience, relevant professional organizations or experts should be consulted.

　　3. Select based on the cable’s operating environment and requirements.

　　1. When electrical wires and cables are connected to high-power equipment—such as machinery subjected to tensile force, compressive pressure, or long-span creep resistance—reinforced wires and cables should be used, and the cables must be armored.

　　2. When moisture and water resistance are required, wire and cable products featuring a radial waterproof layer and longitudinal waterproofing capabilities may be selected, such as wires and cables with an overall polyethylene sheath extruded over aluminum-plastic tape.

　　3. When the ambient operating temperature is high, high-temperature-resistant wires and cables, such as the ZC series, shall be selected.

　　4. If strong electromagnetic interference resistance is required, shielded wires and cables can be selected, such as the RVVP, BPYJVP, and other series featuring a shielding structure.

　　5. When the operating environment is special and requires protection against termites, rodents, and cold, dedicated termite-, rodent-, and cold-resistant wires and cables may be selected.

　　6. When electrical signals and optical fiber signals are transmitted simultaneously, optoelectronic composite cables can be used directly.

　　7. When flexibility is required for wires and cables, rubber-sheathed cables or elastomer-sheathed cables may be selected.

　　It’s important to note that not all grounding wires comply with national standards. Using low-quality cables carelessly can not only cause electric current to leak into the ground but also lead to wire overloading and overheating, potentially triggering secondary accidents. Therefore, when purchasing grounding wires, always opt for products that come with quality assurance and national-standard certification.