oSIST prEN IEC 63044-3:2026

SLOVENSKI STANDARD
01-julij-2026
Stanovanjski in stavbni elektronski sistemi (HBES) in sistemi za nadzor in
avtomatizacijo stavb (BACS) - 3. del: Zahteve za električno varnost
Home and building electronic systems (HBES) and building automation and control
systems (BACS) - Part 3: Electrical safety requirements
Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) et
systèmes de gestion technique du bâtiment (SGTB) - Partie 3: Exigences de sécurité
électrique
Ta slovenski standard je istoveten z: prEN IEC 63044-3:2026
ICS:
35.240.67 Uporabniške rešitve IT v IT applications in building
gradbeništvu and construction industry
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

23/1179/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63044-3 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-05-29 2026-08-21
SUPERSEDES DOCUMENTS:
23/1164/CD, 23/1176A/CC
IEC TC 23 : ELECTRICAL ACCESSORIES
SECRETARIAT: SECRETARY:
Belgium Mr Wim De Kesel
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 34,TC 61,TC 72 TC 23 Horizontal Group Safety
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Home and Building Electronic Systems (HBES) and Building Automation and Control Systems
(BACS) - Part 3: Electrical safety requirements

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
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IEC CDV 63044-3 © IEC 2026
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IEC CDV 63044-3 © IEC 2026
CONTENTS
CONTENTS . 3
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions. 8
3.2 Abbreviated terms . 11
4 Safety requirements and compliance criteria . 11
5 Requirements . 11
5.1 General . 11
5.2 Classification requirements of installation areas . 11
5.2.1 Overvoltage category . 11
5.2.2 Pollution degree . 12
5.2.3 Material group . 12
5.3 Electrical safety requirements . 12
5.3.1 Protection from hazards in the device . 12
5.3.2 Protection from overvoltage on the network and from hazards caused
by different types of network . 12
5.3.3 Protection from touch current . 15
5.3.4 Protection of the communication wiring from overheating. 16
5.4 Installation . 17
Annex A (informative) List of product standards for electrical safety. 18
Bibliography . 19

Table 1 – Requirements for connection of devices to a dedicated HBES/BACS network . 13
Table A.1 – . 18

IEC CDV 63044-3 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Home and Building Electronic Systems (HBES) and Building Automation
and Control Systems (BACS) -
Part 3: Electrical safety requirements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
standardization comprising all national electrotechnical committees (IEC National Committees).
The object of IEC is to promote international co-operation on all questions concerning
standardization in the electrical and electronic fields. To this end and in addition to other
activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
Publication(s)"). Their preparation is entrusted to technical committees; any IEC National
Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as
possible, an international consensus of opinion on the relevant subjects since each technical
committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted
by IEC National Committees in that sense. While all reasonable efforts are made to ensure that
the technical content of IEC Publications is accurate, IEC cannot be held responsible for the
way in which they are used or for any misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC
Publications transparently to the maximum extent possible in their national and regional
publications. Any divergence between any IEC Publication and the corres ponding national or
regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies
provide conformity assessment services and, in some areas, access to IEC marks of conformity.
IEC is not responsible for any services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including
individual experts and members of its technical committees and IEC National Committees for
any personal injury, property damage or other damage of any nature whatsoever, whether direct
or indirect, or for costs (including legal fees) and expenses arising out of the publication, use
of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
publications is indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
IEC CDV 63044-3 © IEC 2026
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC [had/had not] received notice of (a) patent(s), which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at https://patents.iec.ch.
IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63044-3 has been prepared by IEC technical committee 23: Electrical accessories. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2017 and its Amendment
1:2021. This edition constitutes a technical revision, in coordination with IEC TC 34, TC61,
TC72 and TC108, to align on a Group Safety Publication on electrical safety of HBES/BACS.
This document does not cover functional safety.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Update of IEC standards refered to in this document, both in terms and definitions clause
and in the requirements clauses;
b) Deletion of previous Clause 4 which was void
c) Addition of IEC 63044-6 to be taken into consideration in Clause 5.4
The text of this International Standard is based on the following documents:
Draft Report on voting
23/1164/CD 23/1176/CC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English [change
language if necessary].
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
In this publication, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
This document shall be used in conjunction with relevant product safety standards.
A list of all parts in the IEC 63044 series, published under the general title Home and Building
Electronic Systems (HBES) and Building Automation Control Systems (BACS), can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC CDV 63044-3 © IEC 2026
INTRODUCTION
The IEC 63044 series deals with developing and testing Home and Building Electronic Systems
(HBES) and Building Automation and Control Systems (BACS).
This document deals with electrical safety requirements for HBES/BACS.
This document is based on the philosophy that a device considered electrically safe according
to an appropriate product safety standard should also remain safe when connected to a network.
This document specifies in addition to the specific product standar d the electrical safety
requirements necessary in order for an HBES/BACS device connected to a network to remain
safe under normal and single-fault conditions of the HBES/BACS network and at the same time
under normal and single-fault conditions of one or more HBES/BACS devices connected to the
HBES/BACS network. This includes protection from overvoltages on the network, protection
from hazards caused by connection of different types of network, the limitation of the touch
current to a network and protection of the communication wiring from overheating.
The HBES/BACS network is any interconnection between HBES/BACS devices. The
HBES/BACS networks can be either an ICT network with interfaces classified according to IEC
62949 or a dedicated network classified as a mains, ELV, FELV, SELV or PELV networks.
For HBES/BACS devices connected to an ICT network, the requirements in IEC 62949 apply.
For HBES/BACS devices connected to a dedicated HBES/BACS network, the requirements for
the electrical separation between the device and the network are specified (see Table 1). These
specifications of the electrical separations follow the principle in the basic safety publications
IEC 60664-1:2020 and IEC 61140 [1], together with the installation requirements of IEC 60364
(all parts). The following compromises are used.
– According to the principles of IEC 60664-1, the rated impulse voltage for the separation
shall be the higher of the impulse voltage on the network and the rated impulse voltage of
the device circuit to be connected to the network.
– The overvoltage categories considered by IEC 60664-1 refer to overvoltages derived directly
from the mains through the power supply.
– The overvoltages coming from other sources (e.g. capacitive couplings) are not specified in
IEC 60664-1. IEC 60664-1 recommends that technical committees specify overvoltage
categories or rated impulse voltages as appropriate.
For the purposes of this document, the following impulse voltages have been specified.
– For networks with galvanic electrical separation from mains (FELV, SELV or PELV), the
impulse overvoltage coming from the network side of the separation has been limited to 2,5
kV for fixed installed networks and 1,5 kV for detachable networks.
– For ICT networks, particular requirements apply (see 5.3.2.1).
IEC CDV 63044-3 © IEC 2026
1 Scope
The IEC 63044 series deals with developing and testing Home and Building Electronic Systems
(HBES) and Building Automation and Control Systems (BACS).
This group safety publication is primarily intended to specify the electrical safety requirements
for an HBES/BACS network and for the equipment interfaces to an HBES/BACS network under
normal and single-fault conditions, unless equivalent or higher requirements are included in the
product standard.
It does not apply to interfaces to other networks.
NOTE An example of other networks is a dedicated ICT network covered by IEC 62949.
This document does not cover the electrical safety requirements for the devices connected to
the HBES/BACS, that are covered by the applicable product standard, except for the equipment
interfaces to an HBES/BACS network.
This document covers the following requirements and compliance criteria:
– protection against hazards from the device;
– protection against overvoltages on the network;
– protection against touch current;
– protection against hazards caused by different types of network;
– protection of the communication wiring against overheating caused by excessive current.
This document is also intended to be used by technical committees in the preparation of product
standards for the safety requirements of the equipment interfaces to be connected to an
HBES/BACS network, in accordance with the principles laid down in IEC Guide 104.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60038:2009, IEC standard voltages
IEC 60050-195:2021, International Electrotechnical Vocabulary (IEV) - Part 195: Earthing and
protection against electric shock
IEC 60050-826:2022, International Electrotechnical Vocabulary (IEV) - Part 826: Electrical
installations
IEC 60364 (all parts), Low-voltage electrical installations
IEC 60364-5-52, Low-voltage electrical installations - Part 5-52: Selection and erection of
electrical equipment - Wiring systems
IEC 60664-1, Insulation coordination for equipment within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC CDV 63044-3 © IEC 2026
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems -
Part 1: Principles, requirements and tests
IEC 61180, High-voltage test techniques for low-voltage equipment - Definitions, test and
procedure requirements, test equipment
IEC 62151:2000, Safety of equipment electrically connected to a telecommunication network
IEC 62949, Particular safety requirements for equipment to be connected to information and
communication networks
IEC 63044-1, Home and Building Electronic Systems (HBES) and Building Automation and
Control Systems (BACS) - Part 1: General requirements
IEC 63044-6:2021, Home and building electronic systems (HBES) and building automation and
control systems (BACS) - Part 6: Requirements for planning and installation
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63044-1 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
ICT network
information and communication technology network
metallically terminated transmission medium consisting of two conductors intended for
communication between equipment that may be located in separate buildings, excluding:
– the mains system for supply, transmission and distribution of electrical power, if used as a
communication transmission medium;
– dedicated HBES/BACS networks;
– external networks using ES1 connecting units of audio/video, information and
communication technology equipment.
Note 1 to entry: This may include twisted pairs, and may include networks which are subjected to transients as
indicated in Table 14, ID1 of IEC 62368-1 [2]:2014 (assumed to be 1,5 kV).
Note 2 to entry: An ICT network may be:
– publicly or privately owned;
– subject to transient overvoltages due to atmospheric discharges and faults in power distribution systems;
– subject to longitudinal (common mode) voltages induced from nearby power lines or electric traction lines.
Note 3 to entry: Examples of ICT networks are:
– a public switched telephone network;
– a public data network;
– an Integrated Services Digital Network (ISDN);
– a private network with electrical interface characteristics similar to the above.
IEC CDV 63044-3 © IEC 2026
3.1.2
electric shock
physiological effect resulting from an electric current passing through a human or livestock
[SOURCE: IEC 60050-195:2021 , 195-01-04]
3.1.3
basic protection
protection against electric shock under normal conditions
[SOURCE: IEC 60050-195:2021, 195-06-01]
3.1.4
fault protection
protection against electric shock under single-fault conditions
[SOURCE: IEC 60050-195:2021 195-06-02]
3.1.5
mains
power supply system with nominal voltage according IEC 60038:2009, Table 1
3.1.6
mains network
electrical network in which the nominal voltage cannot exceed mains voltage under normal
conditions
3.1.7
extra low voltage
ELV
nominal voltage in the electrical installation of buildings according to the voltage band I
specified in IEC 61140 [1]
Note 1 to entry: Voltage band I according to IEC 61140 [1] is a voltage below or equal to 50 V AC or 120 V DC.
3.1.8
extra low voltage network
ELV network
electrical network in which the nominal voltage cannot exceed ELV (3.1.7) under normal
conditions
Note 1 to entry: An ELV network is not safe to touch.
3.1.9
...