What is the maximum allowed voltage drop introduced by the galvanic isolator at its ampacity rating?

The correct maximum allowed voltage drop introduced by the galvanic isolator at its ampacity rating is 2.5 volts. This standard is in place because a galvanic isolator is designed to prevent galvanic corrosion in a marine environment by isolating the AC electrical system from the DC ground. A limit on voltage drop is necessary to ensure efficient system performance while maintaining the protective functions of the galvanic isolator.

When a galvanic isolator is installed, it will inherently introduce some resistance to the circuit, resulting in a voltage drop. Keeping this voltage drop to a maximum of 2.5 volts guarantees that the electrical system functions properly without compromising the safety features provided by the isolator. If the voltage drop is too high, it can lead to reduced performance of the electrical devices fed by that circuit, potential malfunctions, and an increased risk of corrosion.

In this context, each of the other options representing higher voltage drops would potentially compromise the operational integrity of the connected electrical system, making them unsuitable as standards for galvanic isolators. Numerical specifications like these are critical to ensure compatibility and safety in marine electrical systems.