The primary distribution box refers to the main distribution box, typically located in the distribution room. Let's make an example for clarity: A newly constructed residential area introduces a 10kV power line to a substation. From the transformer's low-voltage side (0. However, when it comes to their meanings and functions, some might be quite unclear. Each. Electrical systems power our homes, offices, and industrial facilities, but behind every reliable electrical setup lies a crucial component that often goes unnoticed: the distribution box. This essential piece of equipment serves as the nerve center of your electrical system, managing power flow. In any electrical system, the distribution box is the heart and brain, a critical component that safely manages and distributes power from the main source to various circuits.