The safety distance ( S ) is determined by: [ S = K \times T + C ] Where:
anthropometric data (human body measurements). It addresses three primary reaching scenarios: Reaching Over: How high a fence needs to be based on its distance from the hazard. Reaching Through: How far a hazard must be from a guard based on the size of the opening (slots, squares, or round holes). Reaching Under: Distances to prevent lower limb access. Key Takeaways for Engineers and Safety Managers Opening Size Matters: A slot wide enough for a finger requires a much smaller standoff distance than an opening that admits a whole arm. For example, slot openings larger than 180mm or round openings over 240mm are considered to permit full body access. The 95th Percentile: The values in the standard are selected to cover 95% of the population. However, it's worth noting that individuals with "extreme dimensions" might still be able to reach hazard zones, which is why a thorough risk assessment remains critical. Integrated Design: ISO 13857 is intended to be used with protective structures like guards or impeding devices. It is now more closely aligned with iso 13857
Example (extract): | Protective structure height (mm) | Hazard zone height (mm) | Minimum horizontal distance (mm) | |--------------------------------|-------------------------|----------------------------------| | 1000 | 1000 | 600 | | 1400 | 1200 | 400 | | 1800 | 1400 | 150 | The safety distance ( S ) is determined
You're referring to ISO 13857!
Overall, ISO 13857 provides a framework for ensuring the safety of machinery by providing guidelines for the design, construction, and evaluation of guards and protective devices. By implementing this standard, manufacturers can reduce the risk of accidents and injuries, improve safety, and comply with regulatory requirements. Reaching Under: Distances to prevent lower limb access
ISO 13857 applies to a wide range of industries, including:
If a guard has mesh openings, the distance is determined by the size and shape of those openings (e.g., a 20mm square vs. a 20mm slot).