🔍 Key Concepts

• High-voltage definition in common marine engineering practice and SOLAS/IEC standards • Difference between low, medium, and high voltage ranges on ships • Typical shipboard distribution voltages versus special high‑voltage systems (e.g., bow thrusters, propulsion)

💭 Think About

• Think about what voltage range is normally used for main switchboards and distribution on most commercial vessels, and whether that is called "high voltage" or not. • Consider what voltage levels usually require special training, extra PPE (personal protective equipment), and special high‑voltage procedures. • Ask yourself: At about what voltage do insulation, arcing, and clearance requirements change significantly and get treated as a separate "high‑voltage" category?

✅ Before You Answer

• Compare the options to common shipboard systems: 440 V services vs. propulsion or large motor systems. • Recall that high‑voltage ships usually operate in the kV (thousands of volts) range, not just a few hundred volts. • Verify which of the choices is commonly associated with special high‑voltage certification and equipment rather than standard ship service voltage.