Electrician Red Seal · Question
A contractor is building a new commercial office space. The plans specify the installation of several 3-phase, 4-wire, 347/600 V fluorescent lighting circuits. What is the MINIMUM voltage rating for the neutral conductor insulation in this system, according to the Canadian Electrical Code (CEC)?
For a 347/600 V system, the line-to-neutral voltage is 347 V. CEC Rule 4-022(1) generally requires that where conductors of different voltages are in the same e
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Question: A contractor is building a new commercial office space. The plans specify the installation of several 3-phase, 4-wire, 347/600 V fluorescent lighting circuits. What is the MINIMUM voltage rating for the neutral conductor insulation in this system, according to the Canadian Electrical Code (CEC)?
Answer options:
- 150 V
- 300 V ✅ 600 V
- 1000 V
Correct answer: 600 V
Explanation: For a 347/600 V system, the line-to-neutral voltage is 347 V. CEC Rule 4-022(1) generally requires that where conductors of different voltages are in the same enclosure, all conductors must have an insulation rating at least equal to the highest voltage present. Therefore, the neutral conductor must have an insulation rating of 600 V.
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