Home and Building Electronic Systems (HBES) and Building Automation and Control Systems (BACS) - Part 3: Electrical safety requirements<br />

IEC 63044-3:2017 provides the electrical safety requirements related to the HBES/BACS network in addition to the product safety standards for HBES/BACS devices. It also applies to devices used within an HBES/BACS network for which no specific HBES/BACS product safety standard exists. In addition, it defines safety requirements for the interface of equipment intended to be connected to an HBES/BACS network. 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 is applicable to
operator stations and other human–system interface devices,
devices for management functions,
control devices, automation stations and application-specific controllers,
field devices and their interfaces, and
cabling and interconnection of devices  used within a dedicated HBES/BACS network. This document covers the following requirements and compliance criteria:
protection from hazards in the device;
protection from overvoltages on the network;
protection from touch current;
protection from hazards caused by different types of circuit;
protection of the communication wiring from overheating caused by excessive current.

Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) et systèmes de gestion technique du bâtiment (SGTB) - Partie 3: Exigences de sécurité électrique<br />

L'IEC 63044-3:2017 fournit les exigences de sécurité électrique relatives au réseau HBES/SGTB outre les normes de sécurité de produits applicables aux dispositifs HBES/SGTB. Elle s'applique également aux dispositifs utilisés dans un réseau HBES/SGTB pour lequel il n'existe aucune norme de sécurité de produit HBES/SGTB spécifique. De plus, elle spécifie des exigences de sécurité relatives à l'interface des équipements destinés à être connectés à un réseau HBES/SGTB. Elle ne s'applique pas aux interfaces avec d'autres réseaux.
NOTE Un réseau TIC dédié traité par l'IEC 62949 constitue un exemple d'autres réseaux. Le présent document est applicable aux
postes d’opérateur et autres dispositifs d’interface homme-système,
dispositifs pour des fonctions de gestion,
dispositifs de commande, postes d’automatisation et contrôleurs spécifiques à une application,
dispositifs de terrain et leurs interfaces, et
câblage et interconnexion des dispositifs  utilisés dans un réseau HBES/SGTB dédié. Le présent document couvre les exigences et critères de conformité suivants:
protection contre les dangers dans le dispositif;
protection contre les surtensions sur le réseau;
protection contre le courant de contact;
protection contre les dangers provoqués par différents types de circuits;
protection du câblage de communication contre les températures excessives provoquées par un courant trop élevé.  Mots clé: domotique

General Information

Status
Published
Publication Date
26-Jan-2017
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
27-Jan-2017
Ref Project

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IEC 63044-3
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Home and Building Electronic Systems (HBES) and Building Automation and
Control Systems (BACS) –
Part 3: Electrical safety requirements
Systèmes Electroniques pour les Foyers Domestiques et les Bâtiments (HBES)
et Systèmes de Gestion Technique du Bâtiment (SGTB) –
Partie 3: Exigences de sécurité électrique
IEC 63044-3:2017-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63044-3
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Home and Building Electronic Systems (HBES) and Building Automation and
Control Systems (BACS) –
Part 3: Electrical safety requirements
Systèmes Electroniques pour les Foyers Domestiques et les Bâtiments (HBES)
et Systèmes de Gestion Technique du Bâtiment (SGTB) –
Partie 3: Exigences de sécurité électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.01; 29.120.99 ISBN 978-2-8322-3875-2

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63044-3:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms, definitions and abbreviated terms ........................................................................ 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms ................................................................................................. 10

4 Classification of HBES/BACS network interfaces ........................................................... 10

4.1 General ................................................................................................................. 10

4.2 ICT network .......................................................................................................... 10

4.3 Dedicated network ................................................................................................ 10

5 Safety requirements and compliance criteria.................................................................. 10

6 Requirements ................................................................................................................ 10

6.1 General ................................................................................................................. 10

6.2 Classification requirements of installation areas .................................................... 11

6.2.1 Overvoltage category ..................................................................................... 11

6.2.2 Pollution degree ............................................................................................ 11

6.3 Electrical safety requirements ............................................................................... 11

6.3.1 Protection from hazards in the device ............................................................ 11

6.3.2 Protection from overvoltage on the network and from hazards caused by

different types of circuit ................................................................................. 11

6.3.3 Protection from touch current ......................................................................... 13

6.3.4 Protection of the communication wiring from overheating ............................... 15

6.4 Installation ............................................................................................................ 15

Annex A (informative) List of product standards for electrical safety ..................................... 16

Bibliography .......................................................................................................................... 18

Table 1 – Requirements for connection of devices to a dedicated HBES/BACS network........ 12

---------------------- Page: 4 ----------------------
IEC 63044-3:2017 © IEC 2017 – 3 –
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

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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 63044-3 has been prepared by IEC technical committee 23:

Electrical accessories.

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 text of this standard is based on the following documents:
CDV Report on voting
23/735/CDV 23/747/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
---------------------- Page: 5 ----------------------
– 4 – IEC 63044-3:2017 © IEC 2017

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 63044-3:2017 © IEC 2017 – 5 –
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 standard 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 circuit, 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 products. 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 circuit.

For HBES/BACS products connected to an ICT network, the requirements in IEC 62949 apply.

For HBES/BACS products connected to a dedicated HBES/BACS network, the requirements

for the electrical separation between the device and the network circuit are specified (see

Table 1). These specifications of the electrical separations follow the principle in the basic

safety publications IEC 60664-1 and IEC 61140, together with the installation requirements of

IEC 60364. 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 circuit),

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 6.3.2.1).
---------------------- Page: 7 ----------------------
– 6 – IEC 63044-3:2017 © IEC 2017
HOME AND BUILDING ELECTRONIC SYSTEMS (HBES) AND
BUILDING AUTOMATION AND CONTROL SYSTEMS (BACS) –
Part 3: Electrical safety requirements
1 Scope

This part of IEC 63044 provides the electrical safety requirements related to the HBES/BACS

network in addition to the product safety standards for HBES/BACS devices.

It also applies to devices used within an HBES/BACS network for which no specific

HBES/BACS product safety standard exists.

In addition, it defines safety requirements for the interface of equipment intended to be

connected to an HBES/BACS network. 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 is applicable to
– operator stations and other human–system interface devices,
– devices for management functions,
– control devices, automation stations and application-specific controllers,
– field devices and their interfaces, and
– cabling and interconnection of devices
used within a dedicated HBES/BACS network.
This document covers the following requirements and compliance criteria:
• protection from hazards in the device;
• protection from overvoltages on the network;
• protection from touch current;
• protection from hazards caused by different types of circuit;

• protection of the communication wiring from overheating caused by excessive current.

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 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
---------------------- Page: 8 ----------------------
IEC 63044-3:2017 © IEC 2017 – 7 –

IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:

Principles, requirements and tests

IEC 60664-1:2007, Insulation coordination for equipment within low-voltage 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
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 terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://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 circuits using ES1 connecting units of audio/video, information and
communication technology equipment

Note 1 to entry: This may include twisted pairs, and may include circuits which are subjected to transients as

indicated in Table 14, ID1 of IEC 62368-1:2014 (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);
Under preparation. Stage at the time of publication: IEC/FDIS 62949:2016.
---------------------- Page: 9 ----------------------
– 8 – IEC 63044-3:2017 © IEC 2017

– a private network with electrical interface characteristics similar to the above.

Note 4 to entry: For information about circuit voltages and signals which may be present, see Annex B of

IEC 60950-1:2005.
3.1.2
electric shock

physiological effect resulting from an electric current through a human or animal body

[SOURCE: IEC 60050-195:1998, 195-01-04]
3.1.3
basic protection
protection against electric shock under fault-free conditions
[SOURCE: IEC 60050-195:1998, 195-06-01]
3.1.4
fault protection
protection against electric shock under single-fault conditions
[SOURCE: IEC 60050-195:1998, 195-06-02]
3.1.5
mains
power supply system with nominal voltage according Table 1 of IEC 60038:2009
3.1.6
mains circuit

electrical circuit 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

Note 1 to entry: Voltage band I according to IEC 61140 is a voltage below or equal to 50 V AC or 120 V DC.

3.1.8
extra low voltage circuit
ELV circuit

electrical circuit in which the nominal voltage cannot exceed ELV under normal conditions

Note 1 to entry: An ELV circuit is not safe to touch.
3.1.9
functional extra low voltage circuit
FELV circuit

electrical circuit in which the nominal voltage cannot exceed ELV under normal conditions

Note 1 to entry: FELV has simple separation from mains.

Note 2 to entry: A FELV circuit is not safe to touch and may be connected to protective earth.

3.1.10
safety extra low voltage circuit
SELV circuit
electrical circuit in which the nominal voltage cannot exceed ELV
---------------------- Page: 10 ----------------------
IEC 63044-3:2017 © IEC 2017 – 9 –
– under normal conditions,
– under single-fault conditions, including earth fault in other circuits

Note 1 to entry: SELV has simple separation from PELV and other SELV systems, and earth and protective

separation from all other circuits.

Note 2 to entry: Under normal conditions and single-fault conditions in a dry location inside a building, a SELV

circuit with a voltage not higher than 25 V AC or 60 V DC is safe to touch.
3.1.11
protective extra low voltage circuit
PELV circuit
electrical circuit in which the nominal voltage cannot exceed ELV
– under normal conditions,
– under single-fault conditions, except earth fault in other circuits

Note 1 to entry: PELV has protective separation from all circuits other than PELV, SELV or earth.

Note 2 to entry: PELV circuit is safe to touch within the same equipotential bonding area inside a building under

the following conditions: under normal and single-fault conditions in dry locations and with no large contact area

with a voltage not higher than 25 V AC or 60 V DC; otherwise not higher than 12 V AC or 30 V DC.

3.1.12
simple separation

separation between circuits or between a circuit and earth by means of basic insulation

3.1.13
protective separation
separation of one electric circuit from another by means of
– double insulation, or
– basic insulation and electrically protective screening (shielding), or
– reinforced insulation
[SOURCE: IEC 60050-195:1998, 195-06-19]
3.1.14
basic insulation
insulation of hazardous-live parts which provides basic protection
[SOURCE: IEC 60050-826:2004, 826-12-14]
3.1.15
double insulation
insulation comprising both basic insulation and supplementary insulation
[SORCE: IEC 60050-195:1998, 195-06-08]
3.1.16
supplementary insulation

independent insulation applied in addition to basic insulation for fault protection

[SOURCE: IEC 60050-826:2004, 826-12-15]
3.1.17
electrically protective screening

separation of electric circuits or conductors from hazardous-live parts by an electrically

protective screen (shield) connected to the protective-equipotential-bonding system and

intended to provide protection against electric shock
---------------------- Page: 11 ----------------------
– 10 – IEC 63044-3:2017 © IEC 2017
[SOURCE: IEC 60050-195:1998, 195-06-18]
3.1.18
reinforced insulation

insulation of hazardous-live-parts which provides a degree of protection against electric shock

equivalent to double insulation
[SOURCE: IEC 60050-826:2004, 826-12-17]
3.2 Abbreviated terms

For the purposes of this document, the abbreviated terms given in IEC 63044-1 and the

following apply.
ELV Extra Low Voltage
SELV Safety Extra Low Voltage
PELV Protective Extra Low Voltage
4 Classification of HBES/BACS network interfaces
4.1 General
HBES/BACS networks can be based on the following networks.
4.2 ICT network

The classification of interfaces for devices to be connected to information and communication

technology networks given in IEC 62949 applies.
4.3 Dedicated network

The classification of interfaces for devices to be connected to a dedicated network is LV, ELV,

FELV, SELV or PELV circuit.
5 Safety requirements and compliance criteria

This document shall be used together with the appropriate safety standard for the device to

be part of the HBES/BACS. See Table 1.
6 Requirements
6.1 General

The entire HBES/BACS, media and devices as well as their installation, shall ensure safe

operation by protection against mechanical, chemical, environmental and other hazards and

protection against electric shock, burns and fire during normal use as well as under specified

abnormal conditions.

The entire HBES/BACS, media and devices as well as their installation, shall ensure safe

operation and protection against electric shock, burns and fire during normal use as well as

under single-fault conditions.

Compliance is checked by the classification requirements of installation areas in 6.2, the

electrical safety requirements in 6.3 and the installation requirements in 6.4.
---------------------- Page: 12 ----------------------
IEC 63044-3:2017 © IEC 2017 – 11 –
6.2 Classification requirements of installation areas
6.2.1 Overvoltage category

Devices to be installed as a part of the fixed installation of an HBES/BACS system shall be

classified as overvoltage category III according to IEC 60664-1.

Devices that are not part of the fixed installation but to be supplied from the fixed installation

of an HBES/BACS shall be classified at least as overvoltage category II according to

IEC 60664-1.

Compliance is checked by inspection of the product descriptions and/or installation

instructions.
6.2.2 Pollution degree

All devices of an HBES/BACS system shall be classified at least for pollution degree 2

according to IEC 60664-1.

Compliance is checked by inspection of the product descriptions and/or installation

instructions.
6.3 Electrical safety requirements
6.3.1 Protection from hazards in the device

Devices of an HBES/BACS shall comply with the electrical safety requirements in the

appropriate product standard in consideration of the required overvoltage category and

pollution degree specified in 6.2.1 and 6.2.2.

An informative non-exhaustive list of product standards for electrical safety is provided in

Annex A.
Compliance is checked by the requirements in the relevant product standard.
6.3.2 Protection from overv
...

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