When can a Level 1 technician open components that are labeled with a high-voltage warning?

• A. Always
• B. Only with supervisor
• C. After disconnecting power
• D. Never

Answer: (D)

High-voltage labels mark energy that can cause lethal shock or an arc flash. As a Level 1 technician, you are not trained or authorized to open or service these components. The safe rule is to never open them in this role. Even if power has been disconnected, stored energy in capacitors and wiring can remain and be released if a component is opened, leading to serious harm. Work on high-voltage systems is reserved for personnel with the proper training, authorization, PPE, and lockout/tagout procedures, typically under supervision or by a higher-qualified technician. If you see a high-voltage warning, back away, notify your supervisor, and have the appropriate qualified person handle any opening or maintenance.