| 摘要 |
An entrance board comprises a body, inside of which current transformers, safety devices, overvoltage protection units, supply devices, switching and protection apparatus are arranged. The board is also equipped with an individual light indication for blowing of a fuse. A ground system is realized by way of two buses, one of which being insulated from the board’s body, another is connected with board’s body. Load circuits are connected to the first bus, apparatus bodies –to another bus. Every overvoltage protection unit is placed in individual body. Load is connected to terminals of overvoltage protection units. |
