Electrician Red Seal · Question
When calculating the ampacity of conductors in a raceway, if you have 8 current-carrying conductors, what derating factor must be applied according to CEC Table 5C?
CEC Table 5C specifies the correction factors for the number of conductors in a raceway. For 7 to 9 conductors, a derating factor of 0.70 (or 70%) must be appli
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Question: When calculating the ampacity of conductors in a raceway, if you have 8 current-carrying conductors, what derating factor must be applied according to CEC Table 5C?
Answer options:
- 0.90
- 0.80 ✅ 0.70
- 0.50
Correct answer: 0.70
Explanation: CEC Table 5C specifies the correction factors for the number of conductors in a raceway. For 7 to 9 conductors, a derating factor of 0.70 (or 70%) must be applied to the conductor's tabulated ampacity.
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