High-voltage hybrid electrical vehicle (HEV) circuits are completely isolated from the 12-volt chassis electrical system. For obvious reasons, technicians working on HEVs should at least be aware of the potential danger of high-voltage electrical circuits. Current practice has been to use a fluorescent orange color on connectors and cables to indicate high-voltage potential. In addition, battery banks and high-voltage components are fully sealed and usually inaccessible without special tools. Most high-voltage components on HEVs are designed to have redundancy. This means that when there are problems with the highvoltage circuit components, the system defaults to limp home on mechanical power.
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