A raw search for a free leads to a dangerous gray area. The IEC is a copyright-protected organization. Downloading a full PDF from unauthorized file-sharing sites (e.g., pirate document archives) violates international copyright law and risks malware infection.
You have likely seen the search term "IEC 60364.pdf" popping up in your browser history. But what exactly is this standard, why is it so massive, and why is it critical to understand its contents before you even think about wiring a circuit? iec 60364.pdf