The transformer can be protected from any accidental contact with live parts. There are basically two types of protection: 1) part: only on the terminal board; 2) metal shell. BBR terminal protection for IP20, two, involving the transformer in the box, according to the box type and different. The structure of the box is related to the weight of the transformer to be installed. In versions with a small transformer installed, the box is equipped with handles for lifting, while in larger versions, there are ring bolts. All boxes include cable sealing sleeves of sufficient size for cable passage.