(1) The load varies greatly with the seasons, and large and medium-sized factories should be equipped with two transformers to supply power to adapt to the drastic changes in the load.(2) The nature of electricity is m-grade load, generally powered by a single power supply, power lines and electrical appliances should be moisture-proof.(3) The plant's internal power supply should be close to where the load is highly concentrated.4 Power distribution facilities must have a certain space for development