The energized installation on services greater than 240V should be avoided.

• A. Taught
• B. Encouraged
• C. Common
• D. Avoided

Answer: (D)

Working on energized high-voltage equipment is dangerous, so the safe practice is to avoid applying power while you’re performing installation or maintenance. For services over 240V, the risk of electric shock and arc flash is significant, and the proper approach is to de-energize first, lock out/tag out if needed, and verify there is no energy before starting work. That makes the sentence flow naturally with the word that expresses the recommended action: avoided. The other options don’t fit because they describe actions or states that don’t convey the safety directive—taught isn’t an action you take with the equipment, encouraged suggests a suggestion rather than a required practice, and common describes frequency, not what you should do.