Permissibility Crossword

4. __________ cables are used to supply power to portable mining equipment.
7. All electrical wiring must be properly __________ to prevent short circuits.
11. All electrical components must meet MSHA _______ before mining usage.
12. Electrical enclosures must be _____-tight to prevent dust and moisture entry.
15. Electrical switches must be labeled for their ___________ function.
16. Explosion-proof enclosures must pass an __________ test to ensure safety.
17. The primary purpose of electrical grounding is to prevent ______ hazards.
18. The max. voltage allowed for battery-powered equipment in mines is_____ volts.

1. Control circuits are designed so that equipment ______ automatically when power fails.
2. MSHA requires electrical equipment to undergo __________ inspections.
3. Power circuits must have circuit breaker protection to prevent excessive ______ flow.
5. To prevent accidental contact, high-voltage components must be____________.
6. _____________ relays are required to protect motors from overheating and damage.
8. The __________ of electrical equipment must display the MSHA approval number.
9. __________ wires must be connected to an effective ground to prevent shock hazards.
10. _____ motors are likely used in underground mining equipment due to high torque.
13. Electrical connectors used in mines must be __________ to prevent sparks.
14. The insulation resistance of electrical cables must be tested using a _________.