When selecting low-voltage and high-voltage cable models, you need to consider several factors, including application, voltage level, insulation material, and conductor material.
Selecting Low-Voltage Cable Models
Low-voltage cables are typically used in low-voltage power distribution systems, such as homes and commercial buildings, with voltage levels generally ranging from 0.6/1kV and below. Common low-voltage cable models include:
BV: Suitable for fixed wiring, such as home lighting and socket wiring.
BVR: Due to its high flexibility, it is often used in applications such as mobile and household appliances.
VV and YJV: Suitable for power transmission in large facilities such as industrial plants. Specifications are selected based on actual power calculations.
Selecting High-Voltage Cable Models
High-voltage cables are primarily used in high-voltage applications, such as power systems and industrial facilities, with voltage levels generally ranging from 35kV and above. Common models include:
YJV and YJLV: Suitable for power transmission and distribution lines ranging from 0.6/1kV to 26/35kV.
ZC-YJV: Suitable for AC power transmission and distribution lines of 1kV and below.
NH-YJV: Suitable for public places, high-rise buildings, and other locations requiring high fire protection.
WDZ-YJY: Suitable for lighting and power applications in flammable and explosive environments such as coal mines.
ZR-YJV: Suitable for public places, subways, ships, and other locations requiring high fire protection.
Specific Steps and Considerations for Selecting Cable Models
Determine the Application: Select the appropriate model based on whether the cable will be used for power transmission, signal transmission, or computer network transmission. For example, home lighting and socket wiring typically use BV or BVR, while industrial plants may require VV or YJV.
Calculate Load Current: Calculate the current based on the power, voltage, and power factor of the equipment. Ensure that the selected cable's current carrying capacity exceeds the calculated load current to ensure safety.
Consider the Installation Method: Cable selection differs for exposed and concealed installations. For exposed installation, which offers good heat dissipation, standard specifications can be selected. For concealed installation, the capacity must be reduced, and larger cable specifications must be selected.
Insulation and Conductor Materials: Polyvinyl chloride (PVC) insulation is commonly used for low-voltage cables, while cross-linked polyethylene (XLPE) insulation is used for medium- and high-voltage cables. Copper conductors are widely used due to their high conductivity, high current carrying capacity, and excellent mechanical properties.
