Electrician Red Seal · Question
An electrician is checking an existing service entrance for a dwelling. They notice the service mast extends 0.9 m (3 ft) above the roof surface. What is the minimum size of conduit required for this mast, according to CEC Rule 6-112(3) table?
CEC Rule 6-112(3) table specifies the minimum rigid conduit size for service masts based on the extension above the roof. For an extension of 0.9 m (3 ft), a mi
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Question: An electrician is checking an existing service entrance for a dwelling. They notice the service mast extends 0.9 m (3 ft) above the roof surface. What is the minimum size of conduit required for this mast, according to CEC Rule 6-112(3) table?
Answer options:
- 32 mm (1 ¼ in.)
- 42 mm (1 ½ in.) ✅ 53 mm (2 in.)
- 63 mm (2 ½ in.)
Correct answer: 53 mm (2 in.)
Explanation: CEC Rule 6-112(3) table specifies the minimum rigid conduit size for service masts based on the extension above the roof. For an extension of 0.9 m (3 ft), a minimum conduit size of 53 mm (2 in.) is required. This rule ensures adequate mechanical strength of the mast.
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