Building type transformer panels are the main distribution of electrical energy to the consumers' premises. The low voltage output of the transformer comes to the main distribution panel and from there, energy is distributed to the secondary panels. The electricity supplied by the main distribution panel can be controlled from a single place and is used together with the compensation panel in large plants. It is divided into two internally and externally according to the place of use. If installation will be made outside the facility, it must be of an external type. Included in the facility is; assembly should be done as natural ventilation.