What information must be marked on the galvanic isolator and its status monitor regarding the AC electrical system rating?

The correct answer emphasizes the need for marking both the voltage and frequency of the AC electrical system on the galvanic isolator and its status monitor. This information is crucial because it helps ensure that the isolator is functioning within the parameters specified for the electrical system of the vessel.

Understanding the voltage rating is essential to prevent damage to electrical components and to ensure they operate safely and efficiently under the given electrical conditions. The frequency rating, typically at 50 or 60 hertz, is also critical since it can influence the performance of motors, generators, and other equipment, which may require specific frequency inputs for optimal operation.

The other options do not comprehensively capture the specific requirements for marking on galvanic isolators. While information about amperage or safety ratings can be significant in certain contexts, they do not address the essential electrical operating parameters—voltage and frequency—that are foundational for safe and effective operation of the AC electrical system.