Which standard pertains to international electro-technical equipment?

The correct choice is the IEC Standard, which stands for the International Electrotechnical Commission. This standard is significant as it specifically focuses on international standards for electrical, electronic, and related technologies. The IEC plays a crucial role in facilitating global trade by harmonizing the technical specifications for electro-technical products, thereby ensuring compatibility and safety across different countries.

Internationally, the IEC standards cover a wide range of areas including electrical equipment, power generation, transmission, and distribution systems, as well as electronic devices. Compliance with these standards ensures that manufacturers and service providers meet the safety, performance, and environmental requirements needed for their products to be used globally.

In contrast, the other standards mentioned serve different purposes. ISO standards relate broadly to various industries and services beyond just electro-technical equipment. ASTM standards focus more on material testing and specifications primarily in the United States. ANSI standards govern the development of American national standards, which may not be applicable internationally. Thus, the IEC Standard uniquely addresses the specific needs and regulations related to international electrotechnical equipment.