Simplified Iec Risk Assessment Calculator Sirac Review

| Benefit | Explanation | |---------|-------------| | Simplicity | Removes the need for complex arithmetic (e.g., fault tree analysis) in early assessment. | | Standardized | Directly traceable to IEC 62061, easing certification (e.g., CE, UKCA, UL). | | Repeatable | Different assessors get similar results if inputs are clear. | | Documentation | Produces auditable evidence for machine file under Machinery Directive 2006/42/EC. | | Free/low-cost | Many open Excel versions exist; no expensive software required. |

Let’s run a practical example: An operator unjam a robotic palletizer twice per shift. simplified iec risk assessment calculator sirac

| Hazard | S | F | P | Pr | Risk Class | Required SIL | |--------|---|---|---|----|------------|----------------| | Rotating shaft access | 2 | 2 | 2 | Medium | 4 | SIL 2 | | Chemical spray | 1 | 1 | 1 | Low | 1 | No safety function needed | | Unexpected startup | 2 | 2 | 2 | High | 5 | SIL 3 | | | Documentation | Produces auditable evidence for

What are the chances the hazard actually triggers? | Hazard | S | F | P

SIRAC calculates the required safety level. You still need to validate that your actual safety circuit (wiring, relays, logic) achieves that level. A SIRAC output of PL d means nothing if you installed a PL c relay.