Video: How to locate catalog number, series number, and date code on QO and Homeline load centers. On the outside Carton Label of the box, which is located at one of the ends of the carton. (See attached pdf Sample Carton Label)This standard describes requirements for numbering and labeling of real property electrical distribution equipment, circuits, and site lighting at Lawrence Livermore National Laboratory. This is an internal LLNL standard meant to guide the design of new facilities, facility modifications, and. How often should I check or update my labels? Can I use regular paper for labeling breakers? Is it safe to open my distribution box by myself? What do numbers like “20A” or “15A” mean on breaker labels? It is normal to feel unsure about your distribution box. Dividing incoming electrical power from the main supply into subsidiary circuits is the. It is intended to provide easy identification of a component's location, power supply, and load information from the equipment label solely and to make it easy to trace equipment power sources and loads for maintenance purposes. The following guidelines should apply in almost all cases for panels. Types, Uses & How to Choose A distribution box, also known as a power distribution box or electrical distribution box, is used to distribute electrical power safely to multiple circuits.