Plug busway is how, how to calculate the amount of work?

Bus refers to the connection of voltage distribution devices at all levels in the substation, as well as transformers and other electrical equipment and the corresponding distribution device connection, most of the use of rectangular or round cross-section of bare wire or stranded wire, which is collectively referred to as the bus. The role of the bus is to collect, distribute and transmit electrical energy. Plug bus is the connection of all levels of voltage distribution devices, as well as transformers and other electrical equipment and the corresponding distribution equipment