If you detect a harmful 250mA DC galvanic current from the boat's ground to the dock ground, what is true regarding galvanic isolators and shore-power polarization transformers?

When dealing with a harmful 250mA DC galvanic current from the boat's ground to the dock ground, it is important to understand the roles of galvanic isolators and shore-power polarization transformers.

A galvanic isolator is designed to block unwanted DC currents from entering the boat from the shore power system. It allows AC currents to pass through while effectively preventing DC currents, such as those caused by galvanic corrosion, from flowing between the boat and the dock. This means if there's harmful galvanic current detected, a functioning galvanic isolator would prevent it from affecting the vessel, thus helping to protect the boat's metal components and reduce the risk of corrosion.

On the other hand, a shore-power polarization transformer serves a different purpose. It provides an isolation feature that helps avoid ground loops and mitigates the risk associated with different electrical potentials between the boat and the dock. While it can help with issues related to AC power supplies and can improve safety, it does not specifically block DC galvanic currents like a galvanic isolator.

Given this understanding, Statement A is true because it acknowledges the protective aspect of galvanic isolators against harmful galvanic currents. Meanwhile, Statement B is false as it may incorrectly imply that polarization transformers also prevent DC