: The standard enforces the classic formula:

Disclaimer: This article is for informational purposes only. Always refer to the official standard text for legal compliance.

As the angle increases beyond 45°, a standard stair transitions into a steeper stepladder, bringing different design constraints.

Understanding DIN EN ISO 14122-3: Standards for Stairs, Stepladders, and Guardrails

These verification procedures ensure that the installed means of access meet the required performance levels in practice, not just on paper.