Arrangement order: The circuit breakers should be arranged from left to right, and the reserved position is generally placed on the right side of the distribution box. Connecting a distribution box correctly is essential for the safe and effective management of electrical circuits. This guide provides step-by-step. The six disconnect rule per the 2017 version of NEC stated “The service disconnecting means for each service permitted by 230. Understanding electrical panel box wiring diagrams is. This is the correct order. I've heard them say take the neutral off first. The problem or confusion occurs when you have three phases. What are Distribution Boxes and Their Importance? Distribution boxes, or electrical junction boxes as they are sometimes called, play a vital role in electrical systems.