(1) The location of the main control building is convenient for the operation of personnel to communicate with each other, easy to inspect and observe the outside equipment and reduce the length of the cable, avoid the noise impact of the lot, in the layout of the main distribution unit side, the distribution device between the combination of the front facilities for layout. (2) The main control room has a better orientation, hot areas should face the prevailing wind direction in summer, to avoid the sun.