In a ladder diagram, when would conductors be shown with the same wire number?

• A. When they are wired together in circuit
• B. When they carry different voltages
• C. When they are part of separate circuits
• D. When they are not connected

Answer: (A)

In ladder diagrams, a wire number labels a single continuous conductor. When two conductor segments share the same wire number, they’re the same wire and are connected together in the circuit, carrying the same electrical potential along that path. That’s why the scenario described—conductors shown with the same wire number—means they are wired together in the circuit. If they carried different voltages, belonged to separate circuits, or weren’t connected, they would have different wire numbers.