Practice question

Why is the neutral conductor a concern in roadway lighting circuits with nonlinear loads?

  1. The neutral carries no current in balanced systems
  2. Triplen harmonics (3rd, 9th, 15th) from nonlinear loads add in the neutral rather than canceling, potentially causing overheating
  3. The neutral is always oversized, so it is never a concern
  4. The neutral conductor is optional

Answer: B — Triplen harmonics (3rd, 9th, 15th) from nonlinear loads add in the neutral rather than canceling, potentially causing overheating

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