🔍 Key Concepts

• Lock-out/Tag-out (LOTO) safety procedures for electrical equipment • Mechanical hazards from rotating machinery and stored energy (e.g., shaft movement) • Differences between electrical isolation and mechanical securing of equipment

💭 Think About

• If you are going to work inside a large DC propulsion motor, what are the worst things that could happen electrically and mechanically? • Which listed steps directly prevent accidental energizing of the motor, and which prevent unexpected movement of the shaft or rotor? • Is a single type of protection (only electrical or only mechanical) enough for safe internal work, or are multiple forms of isolation typically required?

✅ Before You Answer

• Verify which statement(s) deal with electrical isolation and preventing re‑energization of the motor • Verify which statement(s) address preventing unintended rotation or movement of the propulsion shaft • Consider standard marine and industrial practice: for internal maintenance on major propulsion equipment, is both electrical and mechanical isolation generally required, or just one?