They consist of a rigid enclosure housing busbars, circuit breakers, fuses, and wiring terminals. The design emphasizes safety, enabling easy access for maintenance while preventing accidental contact with live electrical parts through secure covers and lockable doors. Distribution boards can. The terms primary, secondary, and tertiary distribution boxes are relative. From the transformer's low-voltage side (0. Since there are no feeder interconnections, a fault will interrupt all downstream customers until it is repaired. These components work together to prevent electrical faults, such. A distribution box—often referred to as a distribution panel or board—is a cabinet that houses electrical parts responsible for delivering electricity to various circuits in a system.