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Independant safety Assesment - Level of Independance?

John Pittwood
What level of independance is required?



This came up in a recent conversation. It should be appropriate to the risk but at the back of my mind I seem to recal a table the went from



SIL4         Totally seperate organisation



Down to an individual from a different department.



Not having been involved directly in this area for some time is this still true?



Are the levels common or do they vary from Standard to Standard?



Regards
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    John, as far as I can see (and I only have EN 62061 and the previous version of EN 61508) the level of independence appears to vary greatly between the differing standards. The machinery market one I think is much more relaxed than the other sectors perhaps understandably. I dont think it actually mentions independance! Whereas I understand that in more onerous standards some (if not all) ask for

    SIL1 Independant engineer

    SIL2 Independant department

    SIL3 Independant Company

    SIL4 Know nothing about this!
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    John, as far as I can see (and I only have EN 62061 and the previous version of EN 61508) the level of independence appears to vary greatly between the differing standards. The machinery market one I think is much more relaxed than the other sectors perhaps understandably. I dont think it actually mentions independance! Whereas I understand that in more onerous standards some (if not all) ask for

    SIL1 Independant engineer

    SIL2 Independant department

    SIL3 Independant Company

    SIL4 Know nothing about this!
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