ABYC Marine Electrical Practice Exam

If voltage at shore power increases under additional loads, what does this indicate?

1. Ground/Neutral connection

2. Loose wiring connection

3. Overloaded circuit

4. Improper grounding

The correct answer is: Ground/Neutral connection

When the voltage at shore power increases under additional loads, it indicates a ground/neutral connection issue. This situation often occurs when there is a poor connection or a fault in the ground or neutral wiring, which can lead to elevated voltage levels being recorded. An ideal electrical system should maintain stable voltage levels regardless of load changes, as proper connections allow for a consistent return path for current. An increased voltage under load suggests that the added load is not being managed effectively due to the compromised ground or neutral connection. In a well-functioning shore power system, any increase in load should not result in a significant voltage change, especially if grounding is properly implemented. Other factors like loose wiring connections or overloaded circuits can also create voltage issues, but they typically manifest in voltage drops rather than increases. Improper grounding can contribute to overall system instabilities but isn't the primary indicator of increasing voltage under load. Recognizing the implications of ground and neutral connections is crucial for maintaining safe and reliable marina power systems.