ABYC Marine Electrical Practice Exam

Voltage drop in AC is not considered for runs less than ______ feet.

1. 50

2. 75

3. 100

4. 150

The correct answer is: 100

In marine electrical systems, the consideration of voltage drop is essential for ensuring efficient and safe operation. Voltage drop occurs when the electrical current experiences resistance as it travels through conductors, leading to a reduction in voltage by the time it reaches the load. The industry standard suggests that for certain lengths of wire runs, the impact of voltage drop becomes negligible, particularly in alternating current (AC) systems. For wire runs less than 100 feet, the voltage drop is generally not a significant concern because the resistance over such a short distance does not cause a substantial decrease in voltage. This threshold allows for ample margins of safety and efficiency in most installations without the need for complex calculations or adjustments. Additionally, the electrical standards reflect that longer runs would typically exhibit more notable voltage drop, warranting careful consideration and possible corrective measures, such as increasing wire gauge to maintain acceptable voltage levels. In summary, the specific guideline that voltage drop in AC is not considered for runs less than 100 feet is based on practical electrical engineering principles that prioritize safe and effective operations in marine environments, reflecting industry consensus on wire management.