What alternative marking can indicate ignition protection on the galvanic isolator?

The marking "ABYC C-1500 Ignition Protected" specifically pertains to a standard developed by the American Boat and Yacht Council (ABYC), which provides guidelines for ensuring that electrical equipment used in marine environments is safe from ignition hazards. This standard relates directly to galvanic isolators and their ability to prevent potential ignition caused by electrical faults or failures, thereby enhancing safety on marine vessels.

The designation indicates compliance with safety requirements that help to mitigate the risk of electrical ignition in marine applications. This is crucial because galvanic isolators are crucial for protecting a vessel's electrical system, especially in preventing galvanic corrosion and ensuring that electrical systems remain safe and operational under various conditions.

Other options may not be specific to marine applications or may pertain to different safety certifications, which do not directly relate to the ignition protection standards established for marine electrical systems. Thus, "ABYC C-1500 Ignition Protected" is the appropriate marking that denotes adherence to the recognized safety standards for galvanic isolators in maritime use.