Let’s address the elephant in the room. Google "ISO 3691-4 PDF" and you will find Chinese rehosters, Russian translation sites, and obscure document libraries.
The risks of free PDFs:
Red-Flag Warning: If the PDF does not have the ISO copyright footer on the bottom left of every page, it is fake. Iso 3691-4 Pdf
The standard mandates that AGVs must have two distinct types of protective equipment:
In most industrialized nations, following harmonized standards like ISO 3691-4 provides a presumption of conformity with machinery directives (e.g., EU Machinery Directive 2006/42/EC). Without the official PDF, proving compliance during a legal audit or insurance claim is extremely difficult. Let’s address the elephant in the room
If you are downloading the ISO 3691-4 PDF to implement AGVs in your facility, use this checklist:
You cannot rely on random forum links for safety standards. Here is the legitimate supply chain for the document: Red-Flag Warning: If the PDF does not have
Warning on "Preview" PDFs: Many sites offer a red-lined "Preview" PDF. This is legal but useless for engineering. It lacks the normative references (the calculations for safety distances). You cannot certify a machine with a preview.