IEC 60364 is the International Electrotechnical Commission's cornerstone standard for the design, erection, and verification of low-voltage electrical installations. However, like all IEC standards, it is copyright-protected and is not legally available for free public download. The "best" PDF is a free, pirated copy; it is the official, up-to-date version obtained through an authorized channel, ensuring you are working with the correct legal document for safety and compliance.
Best practice : Download the (e.g., IEC 60364-4-41:2005+AMD1:2017 CSV) – they include amendments already merged. iec 60364pdf best
Protection against electric shock, thermal effects, overcurrent, and voltage disturbances [IEC 60364-4-41 is particularly important]. like all IEC standards