Primary Distribution Box: Serves as the main distribution box for a construction site or project (usually only one). A distribution box, sometimes referred to as a panel board, distribution board, or breaker panel, is an. Distribution boxes, often called breaker boxes or fuse boxes, are basically the central hub where electricity from your main supply gets divided into different circuits. It houses protective devices such as circuit breakers or fuses, ensuring both equipment protection and user safety. For example, group boxes with 4 to 8 groups. Ensure that. Let's make a hypothesis: a newly built residential area introduces a 10kV incoming line and builds a distribution room. The outgoing line from the low-voltage end of the transformer is 0.