Electrician Red Seal · Question
A journeyperson is installing a new service entrance cable (USEB90) for a detached dwelling. The cable will be run in PVC conduit outdoors. The local utility requires the rigid PVC conduit to extend a minimum of 450 mm (18 in.) below grade. What is the minimum depth of burial required for the USEB90 cable inside the PVC conduit, according to the CEC, if buried directly in the earth?
CEC Table 53 mandates a minimum burial depth for cables in non-metallic raceways of 450 mm (18 in.) below grade. Although the utility specifies a depth for the
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Question: A journeyperson is installing a new service entrance cable (USEB90) for a detached dwelling. The cable will be run in PVC conduit outdoors. The local utility requires the rigid PVC conduit to extend a minimum of 450 mm (18 in.) below grade. What is the minimum depth of burial required for the USEB90 cable inside the PVC conduit, according to the CEC, if buried directly in the earth?
Answer options:
- 300 mm (12 in.) ✅ 450 mm (18 in.)
- 600 mm (24 in.)
- 750 mm (30 in.)
Correct answer: 450 mm (18 in.)
Explanation: CEC Table 53 mandates a minimum burial depth for cables in non-metallic raceways of 450 mm (18 in.) below grade. Although the utility specifies a depth for the conduit, the cable itself must meet minimum burial requirements.
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