Electrician Red Seal · Question
You need to install twelve #12 AWG RW90 copper conductors in a single EMT conduit. What is the minimum trade size of EMT required?
Using CEC Table 10A for the area of a #12 AWG RW90 conductor (13.79 mm²) and multiplying by 12 gives a total area of 165.48 mm². Using Table 9D for EMT and appl
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Question: You need to install twelve #12 AWG RW90 copper conductors in a single EMT conduit. What is the minimum trade size of EMT required?
Answer options:
- 1/2 inch
- 3/4 inch ✅ 1 inch
- 1 1/4 inch
Correct answer: 1 inch
Explanation: Using CEC Table 10A for the area of a #12 AWG RW90 conductor (13.79 mm²) and multiplying by 12 gives a total area of 165.48 mm². Using Table 9D for EMT and applying the 40% fill rule (for more than 2 conductors), a 3/4" EMT (max fill 137 mm²) is too small. A 1" EMT (max fill 225 mm²) is the correct minimum size.
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