Electrician Red Seal · Question
A 3-phase, 4-wire, 120/208 V wye-connected system supplies a balanced non-linear load. Under which condition must the neutral conductor be counted as a current-carrying conductor for ampacity correction purposes?
CEC Rule 4-004(1)(d) states that the neutral conductor must be counted as a current-carrying conductor where a major portion of the load consists of non-linear
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Question: A 3-phase, 4-wire, 120/208 V wye-connected system supplies a balanced non-linear load. Under which condition must the neutral conductor be counted as a current-carrying conductor for ampacity correction purposes?
Answer options:
- It is never counted
- Only when the load is more than 50% of the circuit ampacity ✅ Always, when non-linear loads are present
- Only if the load is unbalanced by more than 10%
Correct answer: Always, when non-linear loads are present
Explanation: CEC Rule 4-004(1)(d) states that the neutral conductor must be counted as a current-carrying conductor where a major portion of the load consists of non-linear loads. Harmonics on these systems can cause significant neutral current, even when the phase currents are balanced.
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