EN 50491-3:2009

SLOVENSKI STANDARD
01-oktober-2009
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General requirements for Home and Building Electronic Systems (HBES) and Building
Automation and Control Systems (BACS) -- Part 3: Electrical safety requirements
Allgemeine Anforderungen an die Elektrische Systemtechnik für Heim und Gebäude
(ESHG) und an Systeme der Gebäudeautomation (GA) - Teil 3: Anforderungen an die
elektrische Sicherheit
Exigences générales relatives aux systèmes électroniques pour les foyers domestiques
et les bâtiments (HBES) et aux Systèmes de Gestion Technique du Bâtiment (SGTB) --
Partie 3: Exigences de sécurité électrique
Ta slovenski standard je istoveten z: EN 50491-3:2009
ICS:
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.

EUROPEAN STANDARD
EN 50491-3
NORME EUROPÉENNE
July 2009
EUROPÄISCHE NORM
ICS 97.120 Supersedes EN 50090-2-2:1996 + A1:2002 + A2:2007 (partially)

English version
General requirements for Home and Building Electronic Systems (HBES)
and Building Automation and Control Systems (BACS) -
Part 3: Electrical safety requirements

Exigences générales relatives aux Allgemeine Anforderungen
systèmes électroniques pour les foyers an die Elektrische Systemtechnik
domestiques et les bâtiments (HBES) für Heim und Gebäude (ESHG) und an
et aux Systèmes de Gestion Technique Systeme der Gebäudeautomation (GA) -
du Bâtiment (SGTB) - Teil 3: Anforderungen an die elektrische
Partie 3: Exigences de sécurité électrique Sicherheit

This European Standard was approved by CENELEC on 2009-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50491-3:2009 E
Foreword
This European Standard was prepared by a joint working group of Technical Committee CENELEC
TC 205, Home and Building Electronic Systems (HBES), and Technical Committee CEN TC 247, Building
Automation, Controls and Building Management.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50491-3 on
2009-03-01.
This European Standard partially supersedes EN 50090-2-2:1996 + corrigendum March 1997 + A1:2002
+ A2:2007.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-03-01
__________
– 3 – EN 50491-3:2009
Contents
Introduction. 4
1 Sc op e . 5
2 Normative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 8
4 Classification of HBES/BACS network interfaces . 9
4.1 Telecommunication network . 9
4.2 Dedicated network . 9
5 Safety requirements and compliance criteria . 9
5.1 General . 9
5.2 Classification requirements of installation areas . 9
5.3 Electrical safety requirements . 9
5.4 Installation . 15
Annex A (normative) Special national conditions . 16
Bibliography . 17
Tables
Table 1 - List of standards for electrical safety (informative) . 10
Table 2 - Requirements for connection of devices to a dedicated HBES/BACS network . 11

Introduction
This European Standard shall be used for products connected to a home and building automation and
control system (HBES/BACS).
The expression HBES/BACS covers any combination of HBES and/or BACS products including their
separate connected/detachable devices linked together via one or more networks.
This European Standard shall be used in conjunction with relevant product safety standards.
Introductory note
The joint working group CLC/TC 205 – CEN/TC 247 has decided to include this introductory note for a
better understanding of the document.
The background for this European Standard is based on the philosophy that a device considered
electrically safe according to an appropriate product safety standard harmonised under the LVD Directive
also should remain safe when connected to a network. This European Standard specifies in addition to
the specific product standard the electrical safety requirements necessary when a HBES/BACS device
connected to a network shall remain safe under normal and single fault condition of the HBES/BACS
network and in the same time under normal and single fault condition of one or more HBES/BACS
devices connected to the HBES/BACS network. This includes protection from over voltages on the
network, protection from hazards caused by connection of different type of circuits, 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 a telecommunication network with interfaces classified according to IEC/TR 62102
or a dedicated network classified as a Mains, ELV, FELV, SELV or PELV circuit.
For HBES/BACS products connected to a telecommunication network the requirements in EN 41003
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 2). These
specifications of the electrical separations follow the principle in the basic safety publications EN 60664-1
and EN 61140 together with the installation requirements of HD 60364-4-41. The following compromises
are used:
Impulse overvoltages considerations:
According to the principles of EN 60664-1 the rated impulse voltage for the separation shall be the
highest of either the impulse voltage on the network or the rated impulse voltage of the device circuit to
be connected to the network.
The overvoltages categories considered by EN 60664-1 refer to overvoltages derived directly from the
mains through the power supply
The overvoltages coming from other sources (eg. capacitive couplings) are not specified in EN 60664-1.
EN 60664-1 recommends that technical committees specify overvoltage categories or rated impulse
voltages as appropriate.
For the purpose of this standard, the following impulse voltages have been specified:
• For networks galvanic electrical separated 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 telecommunication networks, particular requirements apply (see 5.3.2.1).

– 5 – EN 50491-3:2009
1 Scope
This European Standard provides the electrical safety requirements for all devices connected to
HBES/BACS.
This European Standard 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,
– cabling and interconnection of devices.
This European Standard 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 type of circuits;
– protection of the communication wiring from overheating caused by excessive current.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 41003 Particular safety requirements for equipment to be connected to
telecommunication networks and/or a cable distribution system
EN 60664-1:2007 Insulation coordination for equipment within low-voltage systems -
Part 1: Principles, requirements and tests
(IEC 60664-1:2007)
EN 60950-1:2006 Information technology equipment - Safety - Part 1: General requirements
(IEC 60950-1:2005, mod)
EN 60990 Methods of measurement of touch current and protective conductor current
(IEC 60990)
EN 61140:2002 Protection against electric shock - Common aspects for installation and
equipment (IEC 61140:2001)
EN 61180-1 High-voltage test techniques for low-voltage equipment -
Part 1: Definitions, test and procedure requirements (IEC 61180-1)
EN 61180-2 High-voltage test techniques for low-voltage equipment -
Part 2: Test equipment (IEC 61180-2)
CLC/TR 62102 Electrical safety - Classification of interfaces for equipment to be connected
to information and communications technology networks (IEC/TR 62102)
HD 60364-4-41:2007 Low-voltage electrical installations - Part 4-41: Protection for safety -
Protection against electric shock (IEC 60364-4-41:2005, mod.)

HD 384.5.523 S2:2001 Electrical installations of buildings - Part 5: Selection and erection of
electrical equipment - Section 523: Current-carrying capacities in wiring
systems (IEC 60364-5-523:1999, mod.)
IEC 60050-195 International Electrotechnical Vocabulary - Part 195: Earthing and protection
against electric shock
IEC 60050-826 International Electrotechnical Vocabulary - Part 826: Electrical installations
IEC 62151:2000 Safety of equipment electrically connected to a telecommunication network
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
Home and Building Automation and Control (HBES/BACS) products
HBES/BACS products are devices intended to be used for control, monitoring, operation or management
of building services and/or home electronic systems which can interact via a communication network
3.1.2
HBES/BACS network
any interconnection between HBES/BACS products used for communication An HBES/BACS network
can carry digital data as well as analogue signals
3.1.3
HBES/BACS system
the expression HBES/BACS covers any combination of HBES/BACS products (including their separate
connected/detachable devices) linked together via one or more HBES/BACS networks. Other names
used such as “home control network“, “home control systems“, “home and building electronic systems“,
“building systems“, “building automation system“ etc. describes types of HBES/BACS system
3.1.4
telecommunication network
metallically terminated transmission medium intended for communication between equipments that may
be located in separate buildings, excluding
– the mains systems for supply, transmission and distribution of electrical power, if used as a
telecommunication transmission medium,
– cable distribution systems,
– SELV circuits connecting units of information technology equipment
NOTE 1  The term TELECOMMUNICATION NETWORK is defined in terms of its functionality, not its electrical characteristics.
A telecommunication network is not itself defined as being either a SELV circuit or a TNV circuit. Only the circuits in the equipment
are so classified.
NOTE 2  A TELECOMMUNICATION NETWORK may be
- publicly or privately owned,
- s
...