Electrician Red Seal · Question
A journeyman is supervising an apprentice installing a 14 AWG NMD90 cable in a wall cavity that contains thermal insulation. What is the maximum continuous operating temperature rating of the conductor insulation for this type of cable in this application?
While NMD90 cable has conductors rated for 90°C, Rule 4-006(6) of the CEC states that the maximum continuous operating temperature of the conductor insulation f
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Question: A journeyman is supervising an apprentice installing a 14 AWG NMD90 cable in a wall cavity that contains thermal insulation. What is the maximum continuous operating temperature rating of the conductor insulation for this type of cable in this application?
Answer options:
- 60°C
- 75°C ✅ 90°C
- 105°C
Correct answer: 90°C
Explanation: While NMD90 cable has conductors rated for 90°C, Rule 4-006(6) of the CEC states that the maximum continuous operating temperature of the conductor insulation for conductors used in thermal insulation is generally limited to 90°C, and the ampacity must be calculated based on the 90°C column of Table 2.
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