Electrician Red Seal · Question
An electrician is installing a single non-metallic sheathed cable (NMD90) containing three 14 AWG copper conductors for a 15 A lighting circuit in a wall cavity. The ambient temperature is 25°C. What is the MAXIMUM allowable continuous current for this cable?
Rule 14-104(1) of the CEC specifies that the rating of the overcurrent device for circuits supplying outlets for lighting and general use shall not exceed 15 A
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Question: An electrician is installing a single non-metallic sheathed cable (NMD90) containing three 14 AWG copper conductors for a 15 A lighting circuit in a wall cavity. The ambient temperature is 25°C. What is the MAXIMUM allowable continuous current for this cable?
Answer options: ✅ 15 A
- 17 A
- 20 A
- 25 A
Correct answer: 15 A
Explanation: Rule 14-104(1) of the CEC specifies that the rating of the overcurrent device for circuits supplying outlets for lighting and general use shall not exceed 15 A for 14 AWG copper conductors. While Table 2 may show a higher ampacity for the conductor based on its insulation temperature rating, the circuit limitation for general purpose circuits applies.
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