Identification
Main Switch & Main Isolator Main switches shall be identified as follows: Each main switch shall be marked "MAIN SWITCH" and shall be readily distinguishable from
Distribution box switch labeling
Home / Distribution box switch labeling
4 now outlines guidelines for adding necessary descriptions to circuits, circuit modifications, and power sources in a listed manner, with clarity to avoid any existing confusion. This standard describes requirements for numbering and labeling of real property electrical distribution equipment, circuits, and site lighting at Lawrence Livermore National Laboratory. Every home relies on a breaker box (also called a service panel or distribution board) to manage and protect its electrical circuits. If panels and disconnects are mislabelled or not labelled at all, an electrician may be compelled to open disconnect switches.
