The xEV High-Voltage Safety Standards apply to service professionals in North America working on electrified propulsion vehicles with voltages exceeding what thresholds?

• A. 12 V DC
• B. >30 V AC rms and >60 V DC
• C. 1000 V AC
• D. 24 V DC

Answer: (B)

High-voltage safety practices kick in when the energy in the system can pose a real shock or arc hazard. In North American xEV safety standards, anything above 30 V AC (rms) or above 60 V DC is treated as high voltage. This cut-off is chosen because those levels can deliver dangerous currents under real-world conditions, requiring specialized precautions, insulation, PPE, and lockout procedures.

The 30 V AC threshold accounts for the dangers of alternating current, where peak voltages can reach about 42 V, still capable of harming if contact occurs or if fault conditions exist. The 60 V DC threshold reflects the sustained energy a direct current fault can deliver, along with different hazard characteristics such as persistent arcing. Voltages like 12 V or 24 V are generally considered low voltage and don’t automatically trigger HV-specific safety measures, while much higher voltages (like 1000 V AC) would be hazardous but are outside typical automotive HV ranges; the 30/60 thresholds provide a practical, widely adopted line for worker protection in EV propulsion systems.