The fluorescent lights of the substation hummed, a low B-flat that always gave Elias a headache. He stood before "The Beast"—a hulking, legacy high-voltage switchgear panel that had been running since the late nineties. It was due for a major overhaul, but the plant manager, Mr. Henderson, was a man allergic to spending money.
From these inputs, SIRAC calculates a (Low, Medium, High) and—crucially—recommends a required Performance Level (PLr) or Safety Integrity Level (SIL) for the safety-related control system.
: Evaluates risks including loss of human life (R1) and economic loss (R4). Automated Reporting
The SIRAC calculator is designed to benefit a wide range of users, including:
Due to these limitations, the official "SIRAC" version was omitted from the second edition of the IEC standard, replaced by more robust professional software suites. How the Calculator Worked (Example Scenario)
The (Simplified IEC Risk Assessment Calculator) was an early digital tool developed to help engineers determine if a building required a lightning protection system based on the IEC 62305-2 standard .
Can the operator get out of the way?
In the world of machinery safety, the IEC 62061 standard provides a rigorous framework for assessing risk. However, its formal methodology—requiring detailed parameter scoring (Severity, Frequency, Avoidance, Probability) and complex calculations—can be daunting for small to medium-sized enterprises or for early-stage design reviews.