Height structure and outline structure of middle cabinet
The standard central cabinet is of high-low structure, with a front height of 2300mm and a back height of 2000mm；. The height of the contour structure is the same before and after. The bus bars of high and low cabinets are arranged in zigzag, and the instrument room is independently detachable; The busbar of the contour cabinet is arranged vertically in a straight line, and the instrument room and the cabinet body are integrated. The contour structure has more installation space than the high-low structure, and is also convenient for manufacture, operation and maintenance.
Rear and center earthing switch
There are two installation methods for grounding switch of central cabinet: rear installation and central installation. When the grounding switch is placed in the rear position, the cable must enter from the front of the central cabinet during construction or maintenance, which is not convenient for construction. The front door and back door of the central cabinet shall be interlocked with the grounding switch. When the grounding switch is in the middle position, cable construction or maintenance will enter from the lower cabinet door at the rear side. Under normal circumstances, the front and rear sides of the lower part of the cabinet are separated by iron plates, and there is no live conductor on the front side. The back door is interlocked with the grounding switch to achieve "five precautions".