Junction boxes should include panel and circuit numbers. Labels such as these will increase safety for shutdowns and allow facility staff to quickly react to outages. Compliance with UL 969-2017: Standard for Marking and Labeling Systems should be specified for adhesive labels. This is an internal LLNL standard meant to guide the design of new facilities, facility modifications, and. A distribution board (also known as panelboard, circuit breaker panel, breaker panel, circuit breaker, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit. Knowing your distribution box helps you see which breaker does what. Good labeling of breakers is very important. Use. Purpose – This Article is about all electrical equipment numbering system, Electrical Panel Numbering System, Electrical Wire Numbering System, Electrical Relay Numbering System, Electrical Drawing Numbering System, Electrical Schematic Numbering System, Electrical Cable Numbering Systems. What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure. 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. Additionally, some devices installed on the top of the panel and connected to devices inside the panel through terminal blocks should also be numbered according to the circuit.