Selection Method Of Low-voltage Cable And High-voltage Cable Cross-section

Low-voltage cables have a variety of core numbers such as single core, double core, three core, and four core. Single-core cables can be used in single-phase lines or three-phase lines as required. Two-core cables are used for single-phase lines, while three-core and four-core cables are used for three-phase three-wire lines and three-phase four-wire lines respectively. Commonly used low-voltage cable core cross-sectional areas include 10 square meters, 16 square meters, 25 square meters, 35 square meters, 50 square meters, 70 square meters, 95 square meters, 120 square meters, 150 square meters, 185 square meters, 240 square meters, etc.
High-voltage cables must consider their thermal stability during short circuits. Generally, the cross-section of high-voltage cables is selected according to the economic current density, and the allowable current, allowable voltage loss and thermal stability conditions during short circuit are verified.