What condition defines a de-energized HV state?

What condition defines a de-energized HV state?

• A. The HV system is isolated; energy storage discharged; a voltage check shows no measurable voltage at service points.
• B. The HV battery remains fully charged during work.
• C. The DC-DC converter is always on.
• D. The connectors are disconnected but energy remains.

Answer: (A)

A de-energized high-voltage state means there is no energy stored or present in the system that could cause a shock or re-energize components during maintenance. Achieving this requires three things: the HV system must be isolated from its power source so nothing can backfeed energy, the energy storage elements (like capacitors and the HV battery) must be discharged, and a voltage check at service points must show no measurable voltage. This verification is crucial because even if the power source is removed, stored energy can still pose a hazard if not discharged and checked. Keeping the HV battery charged, leaving a DC-DC converter on, or disconnecting connectors while energy remains would all leave energy present in the system and do not constitute a true de-energized state.

A de-energized high-voltage state means there is no energy stored or present in the system that could cause a shock or re-energize components during maintenance. Achieving this requires three things: the HV system must be isolated from its power source so nothing can backfeed energy, the energy storage elements (like capacitors and the HV battery) must be discharged, and a voltage check at service points must show no measurable voltage. This verification is crucial because even if the power source is removed, stored energy can still pose a hazard if not discharged and checked. Keeping the HV battery charged, leaving a DC-DC converter on, or disconnecting connectors while energy remains would all leave energy present in the system and do not constitute a true de-energized state.