Outgoing terminals connect internal wiring to external load circuits. Internal wiring connects all components inside the distribution box. This article discusses the construction of the distribution box, its functional divisions. A distribution box is a key part of electrical systems in buildings. These Distribution Cabinets are to be outdoor type nd to be fabricated out of 2 mm GI sheet steel. Ga Porcelain Cutouts in 160 KVA / 315 KVA box to protect outgoing circuits. The Distribution box system diagram mainly includes the following parts: Incoming line part: Displays the incoming line source of the distribution box, which may be a single-line incoming line or multiple-line incoming lines (such as normal power supply and backup power supply), and marks the.