In an electrical maintenance guide, what safety action must be performed before opening a high-voltage control cabinet?
Answer and explanation
Correct answer: D. Disconnect the main power supply
- Step 1: Standard electrical safety protocols mandate isolating and locking out the main power supply before servicing electrical enclosures. Answer: Disconnect the main power supply. Why not the others: Increasing voltage raises electrocution hazards, water creates severe short-circuit risks, and motor oil is unrelated to electrical panels.
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