I am a new electrician, a property electrician!

Self-maintenance-low voltage part, excluding transformer, etc. , is the maintenance of the property itself, and the electric power bureau is generally the part below the metering watt-hour meter.

Bureau dimension-is the competent part of the electric power bureau, the high-voltage part, including the transformer.

Fan room-refers to all electrical equipment that controls the fan.

Weak current room-refers to the telephone part, cable, network and fire-fighting part. Difference and strong electricity.