What testing procedure is recommended for determining the galvanic current blocking capability of an isolator?

To determine the galvanic current blocking capability of an isolator, the recommended testing procedure is outlined in Appendix II of the A-28 standard. This appendix provides specific methodologies for evaluating the performance of isolators in blocking unwanted galvanic currents, which is critical for the protection of marine electrical systems from corrosion and other issues caused by stray currents.

The procedures laid out in this appendix focus on the electrical characteristics and operational integrity of the isolator under conditions that simulate real-world applications. This thorough approach ensures that the isolator can effectively prevent unwanted currents that can lead to galvanic corrosion, thereby preserving the longevity and safety of marine vessels.

Appendix I, while related, does not specifically address the testing for galvanic current blocking capabilities. ISO Certification and IEC Standards may provide broader guidelines or frameworks for electrical installations but do not focus on the specific isolation testing outlined in the A-28 standard. Hence, referring specifically to Appendix II provides the precise information and methodology needed for accurately testing the isolator's performance in this area.