Dianoush Emami is an electrical engineer with 30 years of experience developing high-voltage electrical systems. There is no universally agreed upon definition of what constitutes a high-voltage system, but definitions generally depend on industry standards and safety risks. The National Electric Code defines high voltage as anything over 100 volts that can harm a person, while outside the US high voltage is considered 600 volts or more, with low voltage being 120 volts or less.