Electrician Red Seal · Question
An electrician is installing rigid PVC conduit in an area exposed to direct sunlight in a dry location. The conduit will contain insulated conductors with a temperature rating of 75 °C. The maximum expected ambient temperature is 40 °C. What is the maximum percentage fill permitted for the conduit by the CEC?
Table 8, Note (1) of the CEC specifies that for three or more conductors in a raceway, the maximum fill percentage is 40%. However, Rule 12-902(b) permits a 53%
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Question: An electrician is installing rigid PVC conduit in an area exposed to direct sunlight in a dry location. The conduit will contain insulated conductors with a temperature rating of 75 °C. The maximum expected ambient temperature is 40 °C. What is the maximum percentage fill permitted for the conduit by the CEC?
Answer options:
- 30%
- 40% ✅ 53%
- 60%
Correct answer: 53%
Explanation: Table 8, Note (1) of the CEC specifies that for three or more conductors in a raceway, the maximum fill percentage is 40%. However, Rule 12-902(b) permits a 53% conduit fill if one conductor is installed, 31% for two conductors, and 40% for three or more conductors within a raceway. The question implies an unspecified number of conductors beyond just one, so the 53% applies to conductors of the same type and size, if only one conductor is installed.
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