IEC 62733:2015

IEC 62733 ®
Edition 1.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Programmable components in electronic lamp controlgear – General and safety
requirements
Composants programmables dans les appareillages électroniques de lampes –
Exigences générales et exigences de sécurité

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IEC 62733 ®
Edition 1.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Programmable components in electronic lamp controlgear – General and safety

requirements
Composants programmables dans les appareillages électroniques de lampes –

Exigences générales et exigences de sécurité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.99 ISBN 978-2-8322-2668-1

– 2 – IEC 62733:2015 © IEC 2015

CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General requirements . 10
5 Risk assessment . 11
5.1 General . 11
5.2 Specification of tolerable risk . 11
5.3 Documentation . 11
6 Requirements for abnormal operating and fault conditions . 12
6.1 Abnormal operating and fault conditions in the application of the electronic
lamp controlgear . 12
6.2 Fault conditions for the programmable component . 12
7 Requirements for software . 13
8 Requirements for EMC immunity. 13
Annex A (normative) Software evaluation . 15
A.1 General . 15
A.2 Protective programmable components using software . 15
A.3 Terms and definitions . 15
A.4 Requirements for the architecture . 22
A.5 Measures to avoid errors . 30
Annex B (informative) FTA and FMEA analysis . 34
B.1 FTA results . 34
B.2 FMEA results . 35
Annex C (informative) Guidance on the identification of a protective programmable
component . 37
Annex D (normative) Risk classification . 38
D.1 General . 38
D.2 Frequency of occurrence. 38
D.3 Risk severity . 38
D.4 Classification of risks . 39
Bibliography . 40

Figure B.1 – Example of a fault tree diagram . 35

Table A.1 – General fault/error conditions . 24
Table A.2 – Specific fault/error conditions . 26
Table A.3 – Semi-formal methods . 31
Table A.4 – Software architecture specification . 31
Table A.5 – Module design specification . 32
Table A.6 – Design and coding standards . 33
Table A.7 – Software safety validation . 33
Table D.1 – Frequency definition and categorization (from IEC 61508-5:2010 Annex C) . 38

Table D.2 – Risk severity definitions (from IEC 61508-5:2010, Annex C) . 38
Table D.3 – Safety risk classification . 39

– 4 – IEC 62733:2015 © IEC 2015

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROGRAMMABLE COMPONENTS
IN ELECTRONIC LAMP CONTROLGEAR –
GENERAL AND SAFETY REQUIREMENTS

FOREWORD
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