What is the acceptable voltage drop percentage for electrical circuits on a boat?

The acceptable voltage drop percentage is crucial in ensuring the efficiency and safety of electrical systems on a boat. For branch circuits, a maximum voltage drop of 3% is recommended because this limit helps maintain proper functioning of devices and prevents issues such as inadequate power delivery and overheating. Additionally, for feeders, a maximum voltage drop of 10% is acceptable. This reflects a balance between efficiency in power transmission and allowing for longer runs in the electrical system without significant loss of voltage.

By adhering to these percentages, you help ensure that electrical equipment operates effectively under various load conditions. Maintaining voltage within these limits contributes to the overall safety and reliability of the vessel’s electrical system, which is especially important in a marine environment where fluctuations in power can lead to equipment failure or safety hazards.