Which code denotes the normal switch correspondence relay?

• A. Nwk
• B. Nwc
• C. Nlp
• D. Ns

Answer: (B)

Understanding how relay codes map to functions helps you read signaling diagrams accurately. The normal switch correspondence relay is the one that carries the standard mapping between a switch’s normal position and the circuit contacts it controls under normal conditions. This is identified by the code for normal switch correspondence, Nwc. It serves as the reference point so that when the switch is in its normal position, the relay contacts reflect that arrangement, ensuring predictable and correct signaling. Other codes like Nwk, Nlp, and Ns refer to different relay roles or states and do not describe the switch correspondence function, so they do not denote the normal switch correspondence relay.