You can not take the ground or zero device 1) in wood, asphalt and other non-conductive surface drying room, AC 380V and below and DC 400V and below the electrical equipment enclosure (when Maintenance may also touch electrical equipment enclosure and grounded Other means should still be grounded). 2) Generally dry place, AC rated voltage 127V and below, DC rated voltage 110V and below the electrical equipment enclosure (explosion spaces excluded). Installed in the power distribution panel, control box and distributors of electrical measuring instruments, relays and other low-voltage electrical insulation shell and when damage occurs, the support does not cause dangerous voltage insulator metal base and so on. 3) is mounted on a grounded metal frame, and the frame good contact devices such as casing (except explosion hazard). 4) mounted on the height of the electrical equipment. Staff must boarded wooden ladder to access and work, because the body accidentally touched live less dangerous Henan distribution room cost, and the possibility of the body at the same time touching live parts and equipment housing is large. 1) switch normal power supply and emergency backup generator power can disconnect between the need to use a four-pole neutral switch, and the two can not be connected in parallel. 2) there is danger of a gas explosion in an area and the risk of dust explosion 10 area outlets, swimming pools, baths and other humid places Henan distribution room construction, will be neutral and should be installed together with the line disconnected electrical isolation. 3) In order to maintain the maintenance, to protect the personal safety of Henan distribution room, to be fitted with electrical isolation to endanger the safety of neutral potential isolation. In summary, we have a variety of problems in the design of substation, to be improved in the future. My simple analysis and spotting views for reference only. Inappropriate, please correct me. Henan distribution room | distribution room | Teflon electricity is supplied by Nanyang Fu Long Electric Power Engineering Company Limited. Nanyang Fu Long Electric Power Engineering Co., Ltd. (www.nyfulong.com) strong, credible, Nanyang in Henan transmission equipment and materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Teflon electricity into the brilliant and you work for a better future!