This three-tier distribution system structure — with the main distribution board acting as the primary delivery point, secondary distribution boards serving as intermediate power hubs, and tertiary distribution boards directly supplying end-use equipment — ensures effective power. This three-tier distribution system structure — with the main distribution board acting as the primary delivery point, secondary distribution boards serving as intermediate power hubs, and tertiary distribution boards directly supplying end-use equipment — ensures effective power. A primary distribution box refers to the main distribution panel, usually located in the electrical distribution room. It typically features bottom entry and exit wiring, front-opening access, and uses copper busbars for the main connections to ensure good contact. Let's make an example for clarity: A newly constructed residential area introduces a 10kV power line to a substation. From the transformer's low-voltage side (0. 4kV), power is distributed to a main distribution panel. Secondary distribution boxes, also known as sub-distribution boxes, generally serve specific power supply areas. Main Distribution Board Serves as the primary.
