Factory TN-S system distribution room power introduction method
Thread Content
10/0.4 Power distribution room, TN-S system, dual-circuit power supply. Now it is necessary to supply power to the downstream power distribution room. A fiberglass bridge frame is used, with a 40 * 4 galvanized flat iron, both ends of the flat iron are in good contact with the ground in the distribution room, and are connected to the steel structure at a variable distance in the middle. 1. In this case, can a four-core cable be used for the cable, or must a five-core cable be used. 2. If five-core cables are used, is it still necessary to lay tinned flat iron? 3. Is it necessary to lay a 40-meter cable in all fiberglass bridges? * 4 galvanized flat iron? Friends, please express your opinion. Are there any relevant regulatory requirements?
1. If your output to the lower level is 10KV, you don’t need 4.5 cores. Pull the high voltage directly to the lower level distribution room, and then the lower level distribution room transformer comes out to level N PE. If the output to the lower level is 0.4KV, then I think it must be 5 cores, so as to ensure that the potentials are equal and connected from one point. 2. The main purpose of your FRP bridge is to lay galvanized flat iron because you are afraid of leakage and cannot conduct the electricity inside. The above personal opinion