Electrician Red Seal · Question
An electrician is installing a new service mast on the exterior of a residential building. The service conductors are 3/0 AWG aluminum. What is the minimum standard trade size of rigid metal conduit (RMC) that should be used for this service mast, according to CEC Table 9D?
According to CEC Table 9D (allowing for three conductors per conduit), for 3/0 AWG aluminum conductors, a 41 mm (1 1/2 in.) RMC conduit is the minimum required
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Question: An electrician is installing a new service mast on the exterior of a residential building. The service conductors are 3/0 AWG aluminum. What is the minimum standard trade size of rigid metal conduit (RMC) that should be used for this service mast, according to CEC Table 9D?
Answer options:
- 35 mm (1 1/4 in.) ✅ 41 mm (1 1/2 in.)
- 53 mm (2 in.)
- 63 mm (2 1/2 in.)
Correct answer: 41 mm (1 1/2 in.)
Explanation: According to CEC Table 9D (allowing for three conductors per conduit), for 3/0 AWG aluminum conductors, a 41 mm (1 1/2 in.) RMC conduit is the minimum required size. Smaller sizes would not provide adequate fill area.
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