Power cables are generally divided into single-core, two-core and three-core cables. The single-core cable refers to only one conductor in an insulating layer, and the double-core cable refers to two conductors in an insulating layer. In fact, these two have advantages and disadvantages, for example, when the single-core cable line is long, the control loop with a large current flow in the work or the water is laid, in order to prevent or reduce the middle connection head, or when the single-core cable has a good comprehensive safety engineering than the multi-core cable, the single-core cable can be used.

Is it better to have multiple cable cores or single cable cores

1. From the current point of view, the multi-core current of the same cross-sectional area cable is relatively larger than that of the single core, and the load is large.

2, from the point of view of power loss, the single-core cable is directly grounded at both ends, the metal shielding layer of the cable may also produce circulation up to the cable's carrying capacity, and waste electrical energy to form a loss, multi-core wire is generally a three-core line, because in the cable operation, the sum of the current flowing through the three cores is zero, there is basically no induction voltage at both ends of the cable metal shielding layer.

3, from the cost point of view, in the same cross-sectional area of the wire, the cost of the single-core cable is cheaper than the multi-core, and the multi-core is slightly more expensive.

4, from the installation point of view, the single core wire appears hard when the pipe is worn, and the multi-core is softer and easier to wire.

Qingdao cable manufacturer: What is the national standard cable?

The difference between single-core cable and multi-core cable

2-core cable: When 1kv and the following switching power supply neutral line is immediately grounded device, the number of cable cores in the single-phase electric control loop, when the maintenance line and the neutral point share the same electrical conductor, the 2-core cable should be selected. Direct current power supply system control loop, should choose 2-core cable.

3-core cable: When 1kv and the following switching power supply neutral line is immediately grounded, the number of cable cores in the single-phase electric control loop is: When the maintenance line and the neutral point are separate, the 3-core cable should be selected.

4-core cable: 1kv and the following 4-core cable (3+1 cable), in which the fourth core in addition to grounding protection, but also to transport the power supply system is not balanced current flow and short circuit capacity. Its size is defined by the unbalanced current flow and short circuit capacity, but generally not less than 1/2 of the phase line.

5 core cable: 1kv and the following three-phase four-wire distribution room system software, some of the electrical device distribution equipment routes with higher safety factors, and some of the communication management and automation machinery that not only ensure the safety of electricity, but also the anti-interference grounding device, should choose the TN-C distribution room system software with 5 copper core cables. The maintenance line (PE line) and the neutral point (PN line) are separate, and the section of the cable core is generally 3 large, 2 small or 4 large, 1 small or 5 large.

The difference between 4 core cable and 3+1 core cable: 1kv and the following three-phase four-wire distribution room system software, when the maintenance line and the neutral point share the same electrical conductor, should choose the 4-core cable, and can not choose the 3-core cable plus single-core cable to form a primary circuit, and even immediately use the 3-core cable metal sheath or armored cable layer as the neutral point method. Otherwise, when the 3-phase current is unbalanced, it is equivalent to the operation of the single-core cable line, which is very easy to cause DC effects.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098