Which Sound-Powered Switchboard allows maintenance mechanics to rapidly isolate damaged portions of S/P circuits and quickly repair parallel circuits?

• A. A2
• B. A1
• C. A1 and A2
• D. A1 and A3

Answer: (B)

The important idea is being able to cut out a faulty part of a sound-powered (S/P) circuit without interrupting the rest of the system. A switchboard that lets you do this has a way to sectionalize each S/P path so you can open just the damaged segment while leaving other parallel paths intact. It also supports parallel circuits by keeping those other paths live or quickly reconfigurable so maintenance can proceed on the damaged leg without a full system shutdown.

So, the best choice is the configuration that uses a single switchboard with clear, independent control over the individual SP circuit legs. This setup lets you rapidly isolate the damaged portion and then repair or restore the parallel circuits, minimizing downtime. The other configurations tend to complicate isolation or disrupt parallel paths, making quick repair harder.