How to distinguish the wire numbers on the distribution cabinet? In the distribution cabinet, the distinction of wire numbers is mainly achieved through **numbering rules, marking positions, functional grouping**, etc., with the aim of facilitating installation, maintenance, and troubleshooting. Usually, there will be a mark at regular intervals, which makes it convenient to. Knowing your distribution box helps you see which breaker does what. Good labeling of breakers is very important. Use. Distribution boxes, or electrical junction boxes as they are sometimes called, play a vital role in electrical systems. Today, electrical systems are essential for homes and industries.