High voltage (HV) systems are integral to the operation of electric, hybrid, and fuel cell vehicles. Defined under ISO 6469-3 (voltage class "b"), high voltage refers to electrical levels exceeding 60 V and up to 1500 V DC, or above 30 V and up to 1000 V AC. These systems play a pivotal role in energy-efficient driving, battery charging, and propulsion control. However, the risks associated with high voltage exposure necessitate stringent safety measures.
When voltage exceeds 25 V AC or 60 V DC, coupled with specific current or energy thresholds, hazardous conditions arise, potentially resulting in severe electric shocks or injuries. This underlines the importance of proper training, protective measures, and robust system designs to ensure safety.
As the global automotive industry continues its shift toward electrified powertrains, prioritizing safety in high voltage system operation is vital — not just for the protection of personnel, but also for the reliability and advancement of next-generation vehicles.
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