The db box is usually installed in a dedicated room or electrical enclosure and is connected to the main power source through an electrical service entrance. Unlike single-phase systems, where power is distributed using. This guide provides step-by-step instructions for connecting a distribution box and highlights key factors to consider during installation. What Is a Distribution Box? A distribution box, also known as an electrical distribution board, is a critical component in electrical systems. more Welcome to our. 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. It takes the incoming power and safely distributes it to different circuits throughout your building.