Why is relying solely on warning signs insufficient for EV safety?

• A. Warning signs are sufficient if present.
• B. Risk is negligible if signs exist.
• C. Signs can be damaged or ignored; always validate by isolating energy and verifying zero voltage using proper procedures.
• D. Signs automatically de-energize the system.

Answer: (C)

Warning signs are only indicators, not guarantees. They can be damaged, obscured, or ignored, and even with signs present, energy can remain in the system or be re-energized unexpectedly. To stay safe, you must first de-energize and isolate all energy sources, then verify zero voltage using proper procedures and appropriate test instruments. This combination ensures you aren’t relying on signs alone and that any stored or residual energy is actually removed before work begins. Signs play a role, but they don’t de-energize anything or replace the need for a proper energy-isolation and verification process.