Electrician Red Seal · Question
According to CEC Rule 12-904(3), what percentage of a rigid conduit's cross-sectional area can be occupied by conductors if there are more than two conductors (excluding bonding and neutral for a multi-wire circuit)?
CEC Rule 12-904(3) references Appendix B Table B4, which states that for three or more conductors in a conduit, the maximum fill is 40% of the conduit's cross-s
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Question: According to CEC Rule 12-904(3), what percentage of a rigid conduit's cross-sectional area can be occupied by conductors if there are more than two conductors (excluding bonding and neutral for a multi-wire circuit)?
Answer options:
- 30% ✅ 40%
- 50%
- 60%
Correct answer: 40%
Explanation: CEC Rule 12-904(3) references Appendix B Table B4, which states that for three or more conductors in a conduit, the maximum fill is 40% of the conduit's cross-sectional area. For two conductors, it's 31%, and for one, it's 53%.
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