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I am a new insider of the power supply bureau ~ I just graduated from college ~ I don't know what insider work is!

Power supply bureau is divided into internal work and external work. The inside line is the erection of low-voltage 380 and 220v lines in urban areas. And the maintenance of 380 and 220 volt lines, residential internal lines and transformers. The external line is the erection, inspection, overhaul and maintenance of high voltage 35, 10 kV lines. Find an electrician's manual.