Circuit Breaker Wiring Diagrams - Do-it-yourself-help Circuit Breaker Panel Box Wiring Diagram This diagram illustrates some of the most common circuits found in a typical 200 amp circuit breaker service panel box. The breakers are installed in a panel so that contact is made with one of two hot bus bars running down the middle of the box. Residential Electrical Wiring Diagrams Switch Wiring Diagrams A single switch provides switching from one location only. “Single-Pole” may sound simple, but there are different ways to wire a Single-Pole Switch. The power can come from either the switch box or the fixture box and a set of electrical switch wiring diagrams will explain each of these scenarios to you clearly.