Before re‑energizing the HV system, which step should be completed?

• A. Ensure tools and personnel are clear.
• B. Re‑energize if there is any doubt.
• C. Ensure the area is clear of tools and personnel, and follow OEM re‑energize sequence.
• D. Test energy with a non‑HV meter.

Answer: (C)

Before re-energizing a high‑voltage system, you must ensure the area is clear of tools and personnel and follow the OEM re‑energize sequence. Clearing the area removes the immediate risk of contact, tool drops, or foreign objects causing faults or arc flash as power is restored. Following the manufacturer’s re‑energize sequence ensures the equipment is brought back online in the correct order, with interlocks and safety checks reasserted, so energizing happens safely and predictably.

Relying on just clearing tools or just the sequence alone isn’t enough—ignoring either aspect increases risk. Re‑energizing because there’s any doubt is unsafe, as is testing energy with a non‑HV meter, which may not be rated for HV conditions and does not substitute proper HV verification.