IEC Standard Voltages (Edition 2.0)

This technical specification defines a fundamental set of electrical voltage levels adopted globally for the design and operation of power generation, transmission, and distribution systems. The document establishes standardized nominal voltages for both alternating current and direct current applications, ensuring compatibility and safety across international borders. By providing a unified framework for voltage ratings, it facilitates the interchangeability of electrical equipment and promotes efficient integration of diverse power networks. The content covers specific voltage ranges suitable for various industrial, commercial, and residential contexts, serving as a reference point for engineers and manufacturers when developing electrical components and systems. Adherence to these designated voltage values helps minimize technical barriers in trade and supports the reliable performance of electrical infrastructure worldwide. The specification has undergone review and updates over time to reflect evolving technological needs while maintaining core principles of uniformity and safety in electrical engineering practices.