After maintenance on electrical tools, what should you do before resuming work?

• A. Use the tool immediately if it looks fine.
• B. Do not use the tool and throw it away.
• C. Document the maintenance performed.
• D. Re-test to verify insulation integrity and proper operation.

Answer: (D)

After maintenance on electrical tools, you must re-test to verify insulation integrity and proper operation. Visual checks alone can miss hidden damage such as micro-cracks, moisture ingress, or degraded insulation that maintenance might not fully restore. A proper re-test confirms that the insulation is intact and that all functions—switches, guards, cords, and grounding—work correctly, which helps prevent shock, short circuits, or fires as you return to work. Documenting what was done is good practice, but it doesn’t by itself ensure safety; using the tool without testing is unsafe. Throwing the tool away isn’t necessary unless it’s irreparably damaged. So, re-testing is the necessary step before resuming work.