This document provides specifications for various distribution boxes including dimensions, mounting sizes, and number of ways. Wiring diagram shows both PNP and NPN wiring. Dimensions are shown in mm (in. A distribution box, sometimes referred to as a panel board, distribution board, or breaker panel, is an. Our mission is to meet customer"d5s expectations by providing satisfaction through cost, quality, service, delivery and continuous improvement. It is a vital part and central hub of any electrical system. The hub distributes electrical power from a single input source to various circuits throughout a building. Whether it's a home, office, or factory. ompliant with the safety regulations. You know you according to IEC 332.