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IEC 63044-4
Edition 1.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Home and building electronic systems (HBES) and building automation and
control systems (BACS) –
Part 4: General functional safety requirements for products intended to be
integrated in HBES and BACS
Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) et
systèmes de gestion technique du bâtiment (SGTB) –
Partie 4: Exigences générales de sécurité fonctionnelle pour les produits
destinés à être intégrés dans les HBES et SGTB
your local IEC member National Committee for further information.
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IEC 63044-4
Edition 1.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Home and building electronic systems (HBES) and building automation and
control systems (BACS) –
Part 4: General functional safety requirements for products intended to be
integrated in HBES and BACS
Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) et
systèmes de gestion technique du bâtiment (SGTB) –
Partie 4: Exigences générales de sécurité fonctionnelle pour les produits
destinés à être intégrés dans les HBES et SGTB
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.01; 29.120.99 ISBN 978-2-8322-9898-5
– 2 – IEC 63044-4:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 10
4.1 General . 10
4.2 Method of establishment of the requirements . 10
4.2.1 General . 10
4.2.2 HBES/BACS application environment . 11
4.2.3 Sources of hazards . 11
4.2.4 Hazardous events . 11
4.2.5 Derivation of requirements . 11
5 Requirements for functional safety . 12
5.1 General . 12
5.2 Power feeding . 12
5.3 Life time . 13
5.4 Reasonably foreseeable misuse . 13
5.5 Software and communication . 13
5.6 Remote operations . 15
5.6.1 General recommendations . 15
5.6.2 Within a single building or in its immediate vicinity . 15
5.6.3 From outside the building . 15
5.6.4 Management . 16
Annex A (informative) Example of a method for the determination of safety integrity
levels . 17
A.1 General . 17
A.2 As low as reasonably practicable (ALARP) and tolerable risk concepts . 17
Annex B (informative) Hazards and development of necessary functional safety
requirements . 19
Annex C (informative) Some examples of non-safety-related HBES/BACS applications . 27
C.1 General . 27
C.2 Examples of non-safety-related HBES/BACS applications . 27
C.2.1 Example 1: Oven . 27
C.2.2 Example 2: Devices presenting a high potential risk of hazard . 27
C.2.3 Example 3: Mains plugs, socket outlets and circuits . 28
C.2.4 Example 4: Water temperature adjustment . 28
Bibliography . 29
Figure A.1 – Risk reduction – General concept . 17
Table 1 – Requirements for avoiding inadvertent operations and possible ways to
achieve them . 16
Table A.1 – Example of risk classification of accidents. 18
Table A.2 – Interpretation of risk classes . 18
Table B.1 – Requirements and/or risk reduction measures . 19
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOME AND BUILDING ELECTRONIC SYSTEMS (HBES) AND
BUILDING AUTOMATION AND CONTROL SYSTEMS (BACS) –
Part 4: General functional safety requirements for
products intended to be integrated in HBES and BACS
FOREWORD
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