Here is the PDF version of IEC 61439-1 standard
Understanding IEC 61439-1 Standard: Best Practices for Low-Voltage Power Distribution Systems iec 614391 standard pdf best
https://webstore.iec.ch/preview/ preview_61439-1_e.pdf Here is the PDF version of IEC 61439-1
The International Electrotechnical Commission (IEC) developed the IEC 61439-1 standard to provide a comprehensive framework for low-voltage power distribution systems. This standard is part of a series of standards that address the requirements for low-voltage power distribution systems, including IEC 61439-1 (Low-voltage power distribution systems - Part 1: General rules). The standard aims to ensure the safety, reliability, and performance of low-voltage power distribution systems, which are critical components of modern electrical infrastructure. iec 614391 standard pdf best