This practice-oriented guide describes the most important international standard regarding shorts circuits that was released by the IEC (International Electrotechnical Commission) as IEC 60909-0. It combines explanations, calculations and real-life examples that allow the reader to work on the design and application of low- and high-voltage power systems that conform to IEC 60909-0. The new edition is completely revised and expanded to also cover the standard-compliant prevention of short circuits in electrical networks for photovoltaics and wind energy.