Electrician Red Seal · Question
When calculating raceway fill, a single-conductor mineral-insulated (MI) cable is treated as having what overall cross-sectional area?
CEC Rule 12-910(5) specifies that for raceway fill calculations, single-conductor cables (such as MI cable) are treated as having a cross-sectional area of a ci
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Question: When calculating raceway fill, a single-conductor mineral-insulated (MI) cable is treated as having what overall cross-sectional area?
Answer options:
- The area of its outer diameter
- The area of its copper conductor only ✅ The calculated area of a circle with a diameter equal to the outside dimension of the cable
- The area of a circle with a diameter equal to the cable's nominal trade size
Correct answer: The calculated area of a circle with a diameter equal to the outside dimension of the cable
Explanation: CEC Rule 12-910(5) specifies that for raceway fill calculations, single-conductor cables (such as MI cable) are treated as having a cross-sectional area of a circle with a diameter equal to the cable's actual outside dimension, as listed in CEC Table 10A.
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