ABYC Marine Electrical Practice Exam

If AC and DC run together, how must AC be arranged?

1. Bundled

2. Loosely arranged

3. Sheathed, bundled, or otherwise separated

4. In the same conduit

The correct answer is: Sheathed, bundled, or otherwise separated

When AC and DC conductors need to run together, the AC should be arranged in a manner that minimizes the risk of interference and electrical hazards. The most effective way to achieve this is by ensuring that the AC conductors are sheathed, bundled, or otherwise separated from the DC conductors. This approach mitigates issues related to electromagnetic interference and prevents potential faults that could arise from exposed or improperly arranged conductors. Utilizing sheathing or bundling ensures that the conductors maintain appropriate distances from each other, reducing the likelihood of inductive coupling and cross-talk between the two types of electricity. Additionally, providing physical separation helps in adhering to safety standards and regulations, which are critical in marine electrical systems to prevent accidents or electrical failures. In contrast, the other options—such as loosely arranging the conductors or placing them in the same conduit—do not provide the necessary protections and safety measures. Loose arrangements can lead to increased risk of accidental shorts and exposure, while placing AC and DC in the same conduit could create significant safety hazards due to potential interference and overheating. Thus, the most reliable and safe practice is to ensure proper separation through sheathing, bundling, or other methods.