Electrician Red Seal · Question
In a residential occupancy, NMD-90 (non-metallic sheathed cable) is run through bored holes in wooden joists. What is the minimum distance the edge of the hole must be from the nearest edge of the joist?
CEC Rule 12-516(1) requires that where cables are run through bored holes in wooden members, the hole shall be bored so that the edge of the hole is not less th
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Question: In a residential occupancy, NMD-90 (non-metallic sheathed cable) is run through bored holes in wooden joists. What is the minimum distance the edge of the hole must be from the nearest edge of the joist?
Answer options:
- 19 mm
- 25 mm ✅ 32 mm
- 38 mm
Correct answer: 32 mm
Explanation: CEC Rule 12-516(1) requires that where cables are run through bored holes in wooden members, the hole shall be bored so that the edge of the hole is not less than 32 mm from the nearest edge. If this clearance cannot be maintained, a steel plate of at least 1.3 mm thick is required for protection.
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