Electrician Red Seal · Question
What is the minimum depth of cover for direct-buried Type NMD90 cable supplying a post light in a residential yard, assuming no additional mechanical protection?
NMD90 (Non-Metallic Dry) cable is only rated for use in dry locations and concealed wiring in buildings of combustible construction, as per CEC Rule 12-504. It
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Question: What is the minimum depth of cover for direct-buried Type NMD90 cable supplying a post light in a residential yard, assuming no additional mechanical protection?
Answer options:
- 300 mm
- 450 mm
- 600 mm ✅ NMD90 is not permitted for direct burial.
Correct answer: NMD90 is not permitted for direct burial.
Explanation: NMD90 (Non-Metallic Dry) cable is only rated for use in dry locations and concealed wiring in buildings of combustible construction, as per CEC Rule 12-504. It is not permitted for direct burial or use in wet locations.
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