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What is the derating factor if there are 25 current-carrying power conductors in a raceway?

1) 90
2) 80
3) 70
4) 60

Answer :

Final answer:

The derating factor for 25 current carrying power conductors in a raceway depends on the specific electrical code; without this reference, it is not possible to determine the derating factor confidently.

Explanation:

The question is about determining the derating factor for current carrying conductors in a raceway. When multiple conductors are bundled in a raceway, the ability of each conductor to dissipate heat is reduced, and thus each conductor must carry less current than if it were in free air, to prevent overheating. This requires applying a derating factor. However, the specific derating factor depends on the electrical code being referred to. For example, the National Electrical Code (NEC) in the United States provides a table that specifies the derating factors for different numbers of conductors. Without referring to a specific code or standard, it is not possible to confidently state what the derating factor for 25 conductors would be.

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