High Voltage Electric Vehicle Safety

Learn safe handling of high voltage electric vehicles, including mandatory marking posters and class B supervision. Recognize orange color markings for cables and mandatory protection against electric shock.

Identify and apply high voltage safety measures for ev and hev work: visible warnings, class b voltages, posters with a high voltage expert contact, and orange cable markings.

Explore protection requirements for high voltage EVs and HEVs, including isolation, minimum isolation resistance, grounding, double insulation, barrier enclosures, IP ratings, tool-free connectors, and rapid charger disconnection.

Apply protective devices in EV safety, such as circuit breakers, high voltage fuses, and GFCI, to isolate faults and prevent electric shock, while IP ratings and barrier enclosures shield hazards.

Explore high voltage components in electric and hybrid vehicles, including the e-axle, high voltage battery, inverter, dc-dc and boost converters, and safety systems like the main release and interlock loop.

Learn how high voltage safety systems use service disconnects and interlocks to electrically isolate the battery pack, protecting passengers, technicians, and the vehicle.

Measure insulation resistance across motor, inverter, and cables to verify high voltage isolation. Learn to diagnose isolation loss using dynamic monitoring and codes like 3009.

Explain high voltage isolation and the discharge of bus capacitors after power down, detailing active and passive methods across centralized and decentralized high voltage systems.

Follow a 12-step standard operating procedure to safely disconnect a high voltage system in electric vehicles, from ignition key removal and barriers to terminal insulation, measurements, and PPE protection.

Describe the operating procedure for disconnecting a high voltage system in an EV, including locating, unlocking, releasing, and disconnecting the manual service disconnect, then storing it in a lockable box.

Follow all standards to ensure safe disconnection of a high voltage system. After removing the manual service disconnect, wait 3 to 5 minutes for capacitor discharge in passive discharge systems.

Verify complete de-energization by measuring zero voltage across the battery positive, negative, and vehicle earth after removing the MSD, then update the high voltage de-energized label.