Practice question

What are 'harmonics' in a roadway lighting electrical system?

  1. Musical tones produced by the luminaires
  2. Multiples of the fundamental frequency (60Hz) caused by nonlinear loads such as LED drivers and electronic ballasts, which distort the voltage and current waveforms
  3. The sound of the transformer humming
  4. Vibrations in the lighting pole

Answer: B — Multiples of the fundamental frequency (60Hz) caused by nonlinear loads such as LED drivers and electronic ballasts, which distort the voltage and current waveforms

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Practice more: IMSA Roadway Lighting II Practice Questions - IMSA Roadway Lighting Technician Level II Certification Exam Exam →