How many main physical units are the switchboards composed of, located in various parts of the ship?

The correct number of main physical units that make up the switchboards on a ship is 29. This figure is derived from the standard configurations found in maritime electrical engineering practices, where switchboards are designed to efficiently manage and distribute electrical power throughout the vessel. Each physical unit contributes to the overall functionality, including breakers, monitoring equipment, busbars, and connection terminals, which collectively ensure the safety and reliability of the ship's electrical systems. Understanding the composition of these physical units is crucial for anyone involved in the operation or maintenance of a ship's electrical system, as each unit's role can impact the overall performance and safety of ship operations.