USCG Exam PracticeAC circuits and theory
A shipboard 440 V AC system nameplate rating is stated in RMS. Approximately what is the peak voltage of this system?
- A. 311 V
- B. 440 V
- ✓ 622 VCorrect
- D. 280 V
Why C is correct
Peak = 1.414 × RMS = 1.414 × 440 V ≈ 622 V, as stated in NEETS Mod. 2 §1-2. This distinction matters when selecting insulation and component voltage ratings, since the insulation must withstand the peak, not just the RMS value.
Cited:NEETS Mod. 2 §1-2