EN 61508-5:2010

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions and abbreviations
Annex A (informative) - Risk and safety integrity - General
        concepts
Annex B (informative) - Selection of methods for determining
        safety integrity level requirements
Annex C (informative) - ALARP and tolerable risk concepts
Annex D (informative) - Determination of safety integrity
        levels - A quantitative method
Annex E (informative) - Determination of safety integrity
        levels - Risk graph methods
Annex F (informative) - Semi-quantitative method using
        layer of protection analysis (LOPA)
Annex G (informative) - Determination of safety integrity
        levels - A qualitative method - hazardous event severity
        matrix
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

IEC 61508-5:2010 provides information on the underlying concepts of risk and the relationship of risk to safety integrity (see Annex A); a number of methods that will enable the safety integrity levels for the E/E/PE safety-related systems to be determined (see Annexes C, D, E, F and G). The method selected will depend upon the application sector and the specific circumstances under consideration. Annexes C, D, E, F and G illustrate quantitative and qualitative approaches and have been simplified in order to illustrate the underlying principles. These annexes have been included to illustrate the general principles of a number of methods but do not provide a definitive account. Those intending to apply the methods indicated in these annexes should consult the source material referenced. This second edition cancels and replaces the first edition published in 1998. This edition constitutes a technical revision. It has been subject to a thorough review and incorporates many comments received at the various revision stages.

NEW! Also available: IEC Standards+ 61508:2010, containing all parts, together with a commented Redline version. Changes made in this 2nd edition are highlighted and commented by a leading world expert.

This publication is of high relevance for Smart Grid.