The system includes a main distribution box, sub-distribution boxes, and switch boxes connected to electrical equipment, forming a three-tiered distribution. "Two level protection" mainly refers to the use of leakage protection measures. These boxes feature bottom entry and exit cables, front-opening doors, and main busbars connected with copper strips for optimal contact. From the transformer's low-voltage side (0. We'll chat about what each one does, where it shines, and then dive into how to choose the perfect box for your needs.