Based on an inspection of the cables on one of your ship's service generators, you've decided that the cables need to be replaced. In accordance with 46 CFR Subchapter J (Electrical Engineering), the current-carrying capacity of the replacement generator cables should be what percentage of the continuous generator rating?
• 46 CFR Subchapter J requirements for generator cables • Relationship between continuous generator rating and conductor ampacity (current-carrying capacity) • Why regulations usually require some margin or derating of cables relative to equipment rating
• Look up the specific section in 46 CFR Subchapter J that discusses generator leads or generator cables and see what percentage of the generator rating is required for their current-carrying capacity. • Think about whether regulations would ever allow a conductor that is undersized compared to the continuous generator output, and by how much they might require you to oversize the cables for safety. • Compare each answer choice with what would make sense for overheating protection of cables connected to a continuously loaded generator.
• Verify the exact percentage requirement in 46 CFR Subchapter J for the current-carrying capacity of generator cables relative to the continuous generator rating. • Check that the chosen percentage is not less than the continuous rating and allows a reasonable safety margin. • Confirm that the option you select matches the CFR language about generator leads, feeders, or output cables.
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