Why low-voltage distribution lines (three-phase or single-phase) single-core cable should not be worn alone in the metal tube. Different circuits, different voltage levels of AC and DC wires should not be worn in the same metal tube, the same AC circuit should be worn in the same metal pipe, the tube wire can not have joints. 3 The potential withstand voltage of the wire (cable) used in the explosion hazard shall not be less than 750V and must be worn in a metal pipe. More
Online to sell USB extension line to 20 meters, you can use U disk, camera and other small power equipment, and then long to say, according to the diameter and shielding is better.
If you choose a cable for each layer, then you need 7 cable, each need 3 * 50 + 1 * 25 YJV cable, 2 * 35 cable single laying its carrying capacity is 130A, but multiple cable side by side load Need to consider the use of the coefficient, 3 with the general election 0.7. So need 3 * 50. But you can also choose with the branch cable to reduce the number of cables. Such as 3 * 240 of the two, and then layered branch.
