Central safety power supply systems

This European Standard specifies the general requirements for central power supply systems for an independent energy supply to essential safety equipment. This standard covers systems that are permanently connected to AC supply voltages not exceeding 1 000 V and use batteries as an alternative power source.
Central safety power supply systems are intended to ensure energy supply to emergency escape lighting in the event of normal supply failure and may be suitable for energising other essential safety equipment, for example:
- electric circuits of automatic fire extinguishing installations;
- paging systems and signalling safety installations;
- smoke extraction equipment;
- carbon monoxide warning systems;
- special safety installations related to specific buildings, e.g. high-risk areas.
The power supply of CPS should be dedicated only to the essential safety equipment, and not for other typeof loads such as general purpose IT or industrial systems etc.
Combinations of the aforementioned safety equipment types and / or non-safety equipment loads are permitted together on the same central safety power supply system providing the availability for safety equipment loads is not impaired. A fault occurring in a circuit should not cause the interruption in any other circuit used to supply safety equipment.
Schematic representations of typical central safety power supply equipment are depicted in Clause 4.
Power supply systems for fire alarm equipment that are covered by EN 54 (series) are excluded.

Zentrale Sicherheitsstromversorgungssysteme

Systèmes d'alimentation de sécurité à source centrale

Le présent document définit les exigences générales relatives aux systèmes d'alimentation à source centrale des équipements spécifiques de sécurité. Le présent document couvre les systèmes connectés en permanence aux sources de courant alternatif dont la tension ne dépasse pas 1 000 V et qui utilisent comme source d’alimentation alternative des batteries.
Les systèmes d'alimentation de sécurité à source centrale sont destinés à alimenter l'éclairage de sécurité en cas de défaillance de l'alimentation normale et peuvent être adaptés à l'alimentation d'autres équipements spécifiques de sécurité, par exemple:
—   circuits électriques des installations automatiques pour l'extinction des incendies;
—   systèmes de messagerie et installations de signalisation de sécurité;
—   matériel de désenfumage;
—   systèmes de détection du monoxyde de carbone;
—   installations de sécurité spécifiques à certains bâtiments, par exemple zones à haut risque.
Il est prévu de réserver l’alimentation des systèmes ASC uniquement aux équipements spécifiques de sécurité, et non aux autres types de charges tels que les technologies TI à usage général ou les systèmes industriels, etc.
Les types d’équipements de sécurité susmentionnés peuvent être combinés sur le même système d’alimentation de sécurité à source centrale à condition de ne pas compromettre la disponibilité des charges d’équipements de sécurité. Il est prévu qu’un défaut constaté dans un circuit ne provoque pas l’interruption de tout autre circuit utilisé pour alimenter des équipements spécifiques de sécurité.
Des représentations, sous forme de schémas, d’équipements typiques d'alimentation de sécurité à source centrale figurent à l’Article 4.
Les systèmes d’alimentation des systèmes d’alarme incendie couverts par l’EN 54 (série) sont exclus.

Centralni varnostni napajalni sistemi

Ta evropski standard določa splošne zahteve za centralne napajalne sisteme, ki zagotavljajo neodvisno oskrbo z energijo za nujno potrebno varnostno opremo. Ta standard zajema sisteme, ki so trajno priključeni na izmenično napajalno napetost do največ 1000 V in kot alternativni vir energije uporabljajo baterije.
Centralni varnostni napajalni sistemi so namenjeni za zagotavljanje oskrbe z energijo za razsvetljavo zasilnega izhoda v primeru običajnega izpada napajanja in so lahko primerni za napajanje druge nujno potrebne varnostne opreme, na primer:
– električnih tokokrogov samodejnih naprav za gašenje požara;
– sistemov za osebni klic in signalnih varnostnih naprav;
– opreme za odvod dima;
– sistemov za zaznavanje ogljikovega monoksida;
– posebnih varnostnih naprav, povezanih s posameznimi stavbami (npr. območja z visokim tveganjem).
Centralni napajalni sistemi (CPS) naj bodo namenjeni zgolj za napajanje nujno potrebne varnostne opreme in ne za napajanje drugih vrst opreme (npr. IT za splošne namene, industrijski sistemi itd.).
Omenjene vrste varnostne opreme in/ali opreme, ki ni varnostna, se lahko v okviru istega centralnega varnostnega napajalnega sistema uporabljajo skupaj pod pogojem, da to ne vpliva na razpoložljivost varnostne opreme. Zaradi okvare tokokroga ne sme biti prekinjeno delovanje nobenega drugega tokokroga, ki se uporablja za napajanje varnostne opreme.
Shematski prikaz tipične centralne varnostne napajalne opreme je na voljo v točki 4.
Na področje uporabe ne spadajo napajalni sistemi opreme za požarni alarm, ki so zajeti v skupini standardov EN 54.

General Information

Status
Published
Public Enquiry End Date
21-Apr-2019
Publication Date
01-Feb-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Dec-2021
Due Date
03-Mar-2022
Completion Date
02-Feb-2022

Relations

Effective Date
21-Dec-2021
Effective Date
07-Jun-2022

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50171:2022
01-marec-2022
Nadomešča:
SIST EN 50171:2002
Centralni varnostni napajalni sistemi
Central safety power supply systems
Zentrale Sicherheitsstromversorgungssysteme
Systèmes d'alimentation de sécurité à source centrale
Ta slovenski standard je istoveten z: EN 50171:2021
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
SIST EN 50171:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50171:2022
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SIST EN 50171:2022
EUROPEAN STANDARD EN 50171
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2021
ICS 29.240 Supersedes EN 50171:2001 and all of its amendments
and corrigenda (if any)
English Version
Central safety power supply systems

Systèmes d'alimentation de sécurité à source centrale Zentrale Sicherheitsstromversorgungssysteme

This European Standard was approved by CENELEC on 2021-11-15. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50171:2021 E
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SIST EN 50171:2022
EN 50171:2021 (E)
Contents Page

European foreword ............................................................................................................................................. 4

1 Scope ..................................................................................................................................................... 5

2 Normative references ............................................................................................................................. 5

3 Terms and definitions ............................................................................................................................. 7

4 Operating modes of central safety power supply systems ..................................................................... 9

4.1 General provisions ................................................................................................................................. 9

4.2 Changeover mode .................................................................................................................................. 9

4.3 Mode without interruption ..................................................................................................................... 10

4.4 Changeover mode with an additional control switching device for central switching of the

load ....................................................................................................................................................... 10

4.5 Changeover mode with an additional control switching device for partial switching of the

load ....................................................................................................................................................... 10

4.6 Non-maintained changeover mode ...................................................................................................... 11

4.7 Mode without interruption with an additional control switching device for central switching of

the load ................................................................................................................................................. 11

5 Operating conditions and requirements ............................................................................................... 11

5.1 Normal operating conditions and requirements for central safety power supply systems ................... 11

5.2 Requirements to be specified by the user ............................................................................................ 12

6 Constructional design ........................................................................................................................... 12

6.1 General requirements ........................................................................................................................... 12

6.2 Structure of enclosures ........................................................................................................................ 12

6.3 Battery chargers and rectifiers ............................................................................................................. 13

6.4 Transformers ........................................................................................................................................ 14

6.5 Switchgear and controlgear .................................................................................................................. 14

6.6 Central inverters/group inverters/converters ........................................................................................ 15

6.7 Deep discharge protection ................................................................................................................... 16

6.8 Monitoring and display equipment ....................................................................................................... 16

6.9 Fuses, protective devices and measuring instruments ........................................................................ 17

6.10 Internal wiring ....................................................................................................................................... 18

6.11 Electric strength .................................................................................................................................... 18

6.12 Test systems ........................................................................................................................................ 18

6.13 Batteries ............................................................................................................................................... 19

6.14 Equipment marking .............................................................................................................................. 20

6.15 Warning labels ...................................................................................................................................... 22

7 Required information for safe installation and operation of central safety power supply

systems ................................................................................................................................................ 22

7.1 Documentation ..................................................................................................................................... 22

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SIST EN 50171:2022
EN 50171:2021 (E)

Additional Information ........................................................................................................................... 23

7.2

7.3 Information on Recurring Test .............................................................................................................. 23

7.4 Battery installation and provisions for maintenance ............................................................................. 24

8 Tests ..................................................................................................................................................... 24

8.1 General ................................................................................................................................................. 24

8.2 Verification required before commissioning ......................................................................................... 24

Bibliography ...................................................................................................................................................... 27

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SIST EN 50171:2022
EN 50171:2021 (E)
European foreword

This document (EN 50171:2021) has been prepared by CLC/TC 22X “Power electronics”.

The following dates are fixed:
• latest date by which this document has (dop) 2022-11-15
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2024-11-15
standards conflicting with this document
have to be withdrawn

This document supersedes EN 50171:2001 and all of its amendments and corrigenda (if any).

EN 50171:2021 includes the following significant technical changes with respect to EN 50171:2001:

— The scope and the normative references have been updated.
— A new clause, with general safety requirements, has been added.

— A new operation mode "Mode without interruption with an additional control switching device for central

switching of the load" has been added.
— EMC requirements have been added.

— Maximum superimposed alternating currents of the battery charger have been defined.

— Further requirements on inverters and converters have been added.
— A new clause "Test systems" has been added.

— A new chapter "Required Information for safe installation and operation of central safety power supply

Systems” has been added.
— A new chapter "Tests" has been added.

— A new subclause regarding requirements on parallel battery strings has been added.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

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

This document has been prepared under a Standardization Request given to CENELEC by the European

Commission and the European Free Trade Association.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
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SIST EN 50171:2022
EN 50171:2021 (E)
1 Scope

This document specifies the general requirements for central power supply systems for an independent

energy supply to essential safety equipment. This document covers systems that are permanently connected

to AC supply voltages not exceeding 1 000 V and use batteries as an alternative power source.

Central safety power supply systems are intended to ensure energy supply to emergency escape lighting in

the event of normal supply failure and could be suitable for energizing other essential safety equipment, for

example:
— electric circuits of automatic fire extinguishing installations;
— paging systems and signalling safety installations;
— smoke extraction equipment;
— carbon monoxide warning systems;

— special safety installations related to specific buildings, e.g. high-risk areas.

The power supply of CPS systems is expected to be dedicated only to the essential safety equipment, and

not for other type of loads such as general purpose IT or industrial systems etc.

Combinations of the aforementioned safety equipment types can be used together on the same central

safety power supply system providing the availability for safety equipment loads is not impaired. A fault

occurring in a circuit is expected to not cause the interruption in any other circuit used to supply essential

safety equipment.

Schematic representations of typical central safety power supply equipment are depicted in Clause 4.

Power supply systems for fire alarm equipment that are covered by EN 54 (series) are excluded.

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.

EN 1838, Lighting applications - Emergency lighting

EN 50274, Low-voltage switchgear and controlgear assemblies - Protection against electric shock -

Protection against unintentional direct contact with hazardous live parts

EN 50525-2-31, Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V

(U0/U) - Part 2-31: Cables for general applications - Single core non-sheathed cables with thermoplastic

PVC insulation
EN 60038:2011, CENELEC standard voltages (IEC 60038:2009)

EN 60051 (series), Direct acting indicating analogue electrical measuring instruments and their accessories

(IEC 60051 series)

EN 60146-1-1, Semiconductor converters - General requirements and line commutated converters - Part 1-1:

Specification of basic requirements (IEC 60146-1-1)
EN 60269 (series), Low-voltage fuses (IEC 60269 series)

HD 60364-6:2016, Low-voltage electrical installations - Part 6: Verification (IEC 60364-6:2016)

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SIST EN 50171:2022
EN 50171:2021 (E)

HD 60364-5-557, Low-voltage electrical installations - Part 5-557: Selection and erection of electrical

equipment - Auxiliary circuits (IEC 60364-5-55)

EN 60445, Basic and safety principles for man-machine interface, marking and identification - Identification

of equipment terminals, conductor terminations and conductors (IEC 60445)

EN 60598-1:2015, Luminaires - Part 1: General requirements and tests (IEC 60598-1:2014)

EN 60622, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Sealed nickel-

cadmium prismatic rechargeable single cells (IEC 60622)

EN 60623, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Vented nickel-

cadmium prismatic rechargeable single cells (IEC 60623)

EN 60721-3-3, Classification of environmental conditions - Part 3: Classification of groups of environmental

parameters and their severities - Section 3: Stationary use at weatherprotected locations (IEC 60721-3-3)

EN 60896-11, Stationary lead-acid batteries - Part 11: Vented types - General requirements and methods of

tests (IEC 60896-11)

EN 60896-21:2004, Stationary lead-acid batteries - Part 21: Valve regulated types - Methods of test

(IEC 60896-21:2004)

EN 60896-22, Stationary lead-acid batteries - Part 22: Valve regulated types - Requirements (IEC 60896-22)

EN 60947-2, Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2)

EN 60947-3, Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-

disconnectors and fuse-combination units (IEC 60947-3)

EN 60947-4-1, Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters -

Electromechanical contactors and motor-starters (IEC EN 60947-4-1)

EN 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for industrial

environments (IEC 61000-6-2)

EN 61000-6-3, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission standard for

residential, commercial and light-industrial environments (IEC 61000-6-3)

EN 61000-6-4, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for

industrial environments (IEC 61000-6-4)

EN 61032:1998, Protection of persons and equipment by enclosures - Probes for verification

(IEC 61032:1997)

EN 61439-1:2011, Low-voltage switchgear and controlgear assemblies - Part 1: General rules (IEC 61439-

1:2011)

EN 61558-2-4, Safety of transformers, reactors, power supply units and similar products for supply voltages

up to 1 100 V - Part 2-4: Particular requirements and tests for isolating transformers and power supply units

incorporating isolating transformers (IEC 61558-2-4)

EN 61558-2-6, Safety of transformers, reactors, power supply units and similar products for supply voltages

up to 1 100 V - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply

units incorporating safety isolating transformers (IEC 61558-2-6)

EN 61558-2-16, Safety of transformers, reactors, power supply units and similar products for supply voltages

up to 1 100 V - Part 2-16: Particular requirements and tests for switch mode power supply units and

transformers for switch mode power supply units (IEC 61558-2-16)
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SIST EN 50171:2022
EN 50171:2021 (E)

EN 61951-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary

sealed cells and batteries for portable applications - Part 1: Nickel-cadmium (IEC 61951-1)

EN 62040-1, Uninterruptible power systems (UPS) - Part 1: General and safety requirements for UPS

(IEC 62040-1)

EN 62310-1, Static transfer systems (STS) - Part 1: General and safety requirements (IEC 62310-1)

EN IEC 62485-2:2018, Safety requirements for secondary batteries and battery installations - Part 2:

Stationary batteries (IEC 62485-2:2010)

EN 82079-1, Preparation of instructions for use - Structuring, content and presentation - Part 1: General

principles and detailed requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological 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
automatic transfer switching device
ATSD

device arranged to connect the emergency supply automatically to the essential safety equipment circuit(s)

on failure of the normal supply or to transfer the load from the normal supply to the battery

3.2
battery charger

part of the equipment that provides the charge to the battery from the normal supply

3.3
inverter
device for the conversion of direct current (DC) to alternating current (AC)
3.4
changeover mode

mode in which the emergency power supply source is kept on standby and will, in the event of a failure of the

normal supply, automatically be transferred to the essential safety equipment
3.5
converter
device for changing the voltage of a direct current supply
3.6
mode without interruption

mode in which the emergency power supply source operates in parallel to the normal supply, is connected to

the load and supplies power without interruption when the normal supply fails
3.7
control switch device
CSD

device intended to automatically supply one or several circuits from the emergency power source on failure

of the normal supply; and which could be manually controlled as required by the application standard

Note 1 to entry: A CSD can be located inside or outside of the CPS
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SIST EN 50171:2022
EN 50171:2021 (E)
3.8
deep discharge protection device
device to protect the battery against deep discharge
3.9
rated supply voltage

supply voltage or supply voltages assigned to the equipment by the manufacturer for the

specified operating conditions of the equipment
3.10
rated output current
current, in amperes, supplied by a system at nominal voltage
3.11
normal supply
source of electrical energy that is intended to provide normal power supply
3.12
rated operating time

design period of time during which the load can be supplied whilst the system stays within specified voltage

limits during mains failure
3.13
nominal battery voltage

suitable approximate voltage value of a system calculated using 2 V per cell for lead acid cells and 1,2 V per

cell for nickel cadmium cells
3.14
nominal system voltage
specified output voltage of a central safety power supply system
3.15
minimum voltage

voltage of the central safety power supply system at the end of the rated operating time

3.16
earth fault indication

device to indicate earth faults from either pole of the battery or from a load circuit if connected to the battery

3.17
mains failure indication
device to indicate failure of the normal supply
3.18
central safety power supply system
CPS system

central power supply system which supplies the required power to essential safety equipment with any rated

power output
3.19
low power safety supply system
LPS system

central power supply system where the power output is limited to 500 W for a duration of 3 h or to 1 500 W

for a duration of 1 h
3.20
essential safety equipment

devices required by the relevant authority to protect people in the event of a hazard

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SIST EN 50171:2022
EN 50171:2021 (E)
3.21
central inverter

inverter which supplies the total number of essential safety equipment circuit(s) connected to a CPS or LPS

3.22
group inverter

inverter which supplies a part of the essential safety equipment installation, where the load connected to the

inverter is limited to a single circuit
3.23
expert for safety power supply systems

electrically skilled person with the relevant education to enable him or her, to install and to test a safety

power supply system and to ensure the functional capability of it, by consideration of the relevant standards,

building codes and manufacturer documentation
4 Operating modes of central safety power supply systems
4.1 General provisions

In order to comply with the different operating requirements of the essential safety equipment, various types

of central safety power supply systems are necessary.

This clause describes the basic modes of operation of central safety power supply systems and their

essential characteristics.

In general, two different modes of power supply are defined, the changeover mode and the mode without

interruption. The main difference is the response (changeover) time. In changeover mode, the response time

shall be no more than 0,5 s whereas, in the mode without interruption, the supply is permanent so, naturally,

there is no response time.

The load, the level of discharge and the capacity of the battery determine the rated operating time in the

case of a power failure. For application cases where the load requires an AC supply, an inverter shall be

used. For application cases where a DC supply is required, a direct current adjusted to the load shall be

supplied.
4.2 Changeover mode

In the changeover mode, the essential safety equipment shall be fed directly by normal supply (see

Figure 1). When the load voltage differs from the normal supply voltage, an isolating transformer shall be

used for supply matching. In the event of a mains power failure, the voltage monitor in the automatic transfer

switching device (ATSD) shall transfer the supply to the battery. A controlled battery charger shall be

provided for charging and float charging of the battery.
Figure 1
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SIST EN 50171:2022
EN 50171:2021 (E)
4.3 Mode without interruption

When in the mode without interruption, the battery charger shall be able to energize the essential safety

equipment and to ensure the charging and/or float charging of the battery (see Figure 2 and Figure 3).

Figure 2
Figure 3

In the event of mains failure, the battery shall take over the power supply to load without interruption, and the

battery shall be adequately rated to maintain the output voltage within limits compatible with the safety

equipment connected to the load.

4.4 Changeover mode with an additional control switching device for central switching of

the load

In addition to the devices detailed in 4.2, the equipment includes a control switch device(s) (CSD) which are

activated automatically or manually. The CSD are dependent upon normal supply being available and failure

of the normal supply shall activate the emergency supply automatically. For this, it shall be ensured that the

emergency power supply is available throughout the time required for operation. (See Figure 4.)

A number of control switch devices may be used to switch sections of the load.
Figure 4

4.5 Changeover mode with an additional control switching device for partial switching of

the load

In addition to the devices detailed in 4.2, the equipment includes a control switching device for the section-

wise switching of the loads which is activated by the normal supply (see 4.4).

However, deviating from the design specified in 4.4, part of the load is energised continuously (see Figure 5).

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SIST EN 50171:2022
EN 50171:2021 (E)
Figure 5
4.6 Non-maintained changeover mode

In this case, the essential safety equipment is energised only in the event of normal supply failure. Differing

from the system defined in 4.3, a control switch device or several control switch devices is (are) used

additionally (see Figure 6)
Figure 6

4.7 Mode without interruption with an additional control switching device for central

switching of the load

In addition to the devices detailed in 4.3 the equipment includes a control switch device(s) (CSD) which are

manually activated or controlled by the normal supply in order to divide the loads. The load can be divided

into continuously energized load or another part which can be disconnected (see Figure 7).

Figure 7
5 Operating conditions and requirements
5.1 Normal operating conditions and requirements for central safety power supply
systems

Systems shall be suitable for use under at least the following conditions. Deviations from these conditions

shall be agreed on between user and manufacturer.

a) The system shall be designed for a rated supply voltage as specified in EN 60038:2011, Table 1 and for

a maximum static voltage deviation of ± 10 %.

b) The system shall be designed for a maximum frequency deviation of the supply voltage of ± 4 %.

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SIST EN 50171:2022
EN 50171:2021 (E)

c) The temperature range in which the system can be operated shall be declared and the equipment shall

be capable of operating without condensation in a relative humidity of 85 %.

NOTE 1 Working life and attainable capacity of the batteries are strongly dependent upon battery temperature.

d) The system shall be capable of operating without derating at altitudes of up to 1 000 m above sea level.

NOTE 2 For altitudes above 1 000 m, the supplier is expected to provide on request derating factors.

e) The battery shall be protected against deep discharge.

f) With regard to immunity to electromagnetic disturbance, the system shall comply with requirements for

the industry areas as specified in EN 61000-6-2, and for emitted electromagnetic interferences it shall

comply with the requirements for residential, business and commercial areas as well as small

enterprises as specified in EN 61000-6-3 or where the essential safety equipment is intended for

installation within an industrial environment, with the requirements as specified in EN 61000-6-4.

5.2 Requirements to be specified by the user
At least the following information shall be supplied to the manufacturer:
a) type and value of the rated supply voltage (mains input) and output voltage;
b) load profile over the rated operating time;

c) division of the load (maintained and non-maintained operation), as far as required;

d) permissible changeover time in case of failure of the mains supply;
e) the rated operating time required;
f) type and intended position of the battery;
g) intended system configuration (type of system in accordance with Clause 4);

h) ambient temperature range and relative humidity if different from Class 3K3 (moderate climate) as

specified in EN 60721-3-3.

Additional load specific delay times might have to be taken into account at the design stage.

NOTE For standard CPS/LPS from the suppliers’ catalogue, this information can be predefined by the supplier, so

that the user can choose the suitable system for his needs.
6 Constructional design
6.1 General requirements

The relevant safety requirements of EN 61439-1:2011 and EN IEC 62485-2:2018 shall be fulfilled.

6.2 Structure of enclosures
6.2.1 Enclosures shall have sufficient mechanical strength.
Compliance is checked by inspection and the following test:

A straight and un-jointed test finger is used with the same dimensions as the standard test finger specified in

EN 61032:1998, Figure 7, Test probe 11. The finger is pressed against the surface with a force of

30 N ± 3 N, for a period of 5 s. During the test, metal parts shall not touch live parts. After the test, covers

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EN 50171:2021 (E)
shall
...

SLOVENSKI STANDARD
oSIST prEN 50171:2019
01-april-2019
Centralni varnostni napajalni sistemi
Central safety power supply systems
Zentrale Sicherheitsstromversorgungssysteme
Systèmes d'alimentation de sécurité à source centrale
Ta slovenski standard je istoveten z: prEN 50171:2019
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
oSIST prEN 50171:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50171:2019
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oSIST prEN 50171:2019
EUROPEAN STANDARD DRAFT
prEN 50171
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.240 Will supersede EN 50171:2001
English Version
Central safety power supply systems

Systèmes d'alimentation à source centrale Zentrale Sicherheitsstromversorgungssysteme

This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-04-26.
It has been drawn up by CLC/TC 22X.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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 CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 67775 Ref. No. prEN 50171:2019 E
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1 Contents page

3 European foreword ............................................................................................................................................. 4

4 1 Scope ..................................................................................................................................................... 5

5 2 Normative references ............................................................................................................................. 5

6 3 Terms and definitions ............................................................................................................................. 7

7 4 Operating modes of central safety power supply systems ..................................................................... 9

8 4.1 General provisions ................................................................................................................................. 9

9 4.2 Changeover mode .................................................................................................................................. 9

10 4.3 Mode without interruption ....................................................................................................................... 9

11 4.4 Changeover mode with an additional control switching device for central switching of the

12 load ....................................................................................................................................................... 10

13 4.5 Changeover mode with additional control switching device for partial switching of the load ............... 10

14 4.6 Non-maintained changeover mode ...................................................................................................... 11

15 4.7 Mode without interruption with an additional control switching device for central switching of

16 the load ................................................................................................................................................. 11

17 5 Operating conditions and requirements ............................................................................................... 11

18 5.1 Normal operating conditions and requirements for central safety power supply systems ................... 11

19 5.2 Requirements to be specified by the user ............................................................................................ 12

20 6 Constructional design ........................................................................................................................... 12

21 6.1 Structure of enclosures ........................................................................................................................ 12

22 6.2 Battery chargers and rectifiers ............................................................................................................. 13

23 6.3 Transformers ........................................................................................................................................ 14

24 6.4 Switchgear and controlgear .................................................................................................................. 14

25 6.5 Central inverters/group inverters/converters ........................................................................................ 14

26 6.6 Deep discharge protection ................................................................................................................... 15

27 6.7 Monitoring and display equipment ....................................................................................................... 16

28 6.8 Fuses, protective devices and measuring instruments ........................................................................ 17

29 6.9 Internal wiring ....................................................................................................................................... 17

30 6.10 Electric strength .................................................................................................................................... 18

31 6.11 Test systems ........................................................................................................................................ 18

32 6.12 Batteries ............................................................................................................................................... 19

33 6.13 Equipment marking .............................................................................................................................. 20

34 6.14 Warning labels ...................................................................................................................................... 21

35 7 Required Information for safe installation and operation of central safety power supply

36 Systems ................................................................................................................................................ 22

37 7.1 Documentation ..................................................................................................................................... 22

38 7.2 Additional Information ........................................................................................................................... 22

39 7.3 Information on Recurring Test .............................................................................................................. 22

40 7.4 Battery installation and provisions for maintenance ............................................................................. 23

41 8 Tests ..................................................................................................................................................... 23

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42 8.1 General ................................................................................................................................................. 23

43 8.2 Verification required before commissioning ......................................................................................... 24

44 Annex A (informative) System testing ............................................................................................................. 26

45 Annex ZZ (informative) Relationship between this European Standard and the safety objectives of

46 Directive 2014/35/EU [2014 OJ L96] aimed to be covered .................................................................. 27

47 Bibliography ...................................................................................................................................................... 28

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49 European foreword

50 This document (prEN 50171:2019) has been prepared by CLC/TC 22X “Power electronics”.

51 This document is currently submitted to the Enquiry.
52 The following dates are proposed:
• latest date by which the existence of (doa) dor + 6 months
this document has to be announced
at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to (to be confirmed or
be withdrawn modified when voting)
53 This document will supersede EN 50171:2001.

54 This document has been prepared under a mandate given to CENELEC by the European Commission and

55 the European Free Trade Association, and supports essential requirements of EU Directive(s).

56 For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this

57 document.
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58 1 Scope

59 This document specifies the general requirements for central power supply systems for an independent

60 energy supply to essential safety equipment. This standard covers systems that are permanently connected

61 to AC supply voltages not exceeding 1 000 V and use batteries as an alternative power source.

62 Central safety power supply systems are intended to ensure energy supply to emergency escape lighting in

63 the event of normal supply failure and may be suitable for energizing other essential safety equipment, for

64 example:
65 – electric circuits of automatic fire extinguishing installations;
66 – paging systems and signalling safety installations;
67 – smoke extraction equipment;
68 – carbon monoxide warning systems;

69 – special safety installations related to specific buildings, e.g. high-risk areas.

70 The power supply of CPS systems should be dedicated only to the essential safety equipment, and not for

71 other type of loads such as general purpose IT or industrial systems etc.

72 Combinations of the aforementioned safety equipment types are permitted together on the same central

73 safety power supply system providing the availability for safety equipment loads is not impaired. A fault

74 occurring in a circuit should not cause the interruption in any other circuit used to supply essential safety

75 equipment.

76 Schematic representations of typical central safety power supply equipment are depicted in Clause 4.

77 Power supply systems for fire alarm equipment that are covered by EN 54 (series) are excluded.

78 2 Normative references

79 The following documents are referred to in the text in such a way that some or all of their content constitutes

80 requirements of this document. For dated references, only the edition cited applies. For undated references,

81 the latest edition of the referenced document (including any amendments) applies.

82 EN 1838, Lighting applications - Emergency lighting

83 EN 50272-2:2001, Safety requirements for secondary batteries and battery installations - Part 2: Stationary

84 batteries

85 EN 50274, Low-voltage switchgear and controlgear assemblies - Protection against electric shock -

86 Protection against unintentional direct contact with hazardous live parts

87 EN 50525-2-31, Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V

88 (U0/U) - Part 2-31: Cables for general applications - Single core non-sheathed cables with thermoplastic

89 PVC insulation
90 EN 60038:2011, CENELEC standard voltages

91 EN 60051 (series), Direct acting indicating analogue electrical measuring instruments and their accessories

92 (IEC 60051, series)

93 EN 60146-1-1, Semiconductor converters - General requirements and line commutated converters - Part 1-1:

94 Specification of basic requirements
95 HD 60364-6:2007, Low voltage electrical installations - Part 6: Verification
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96 HD 60364-5-557, Low-voltage electrical installations - Part 5-557: Selection and erection of electrical

97 equipment - Auxiliary circuits

98 EN 60445, Basic and safety principles for man-machine interface, marking and identification - Identification

99 of equipment terminals, conductor terminations and conductors (IEC 60445)

100 EN 60598-1:2015, Luminaires - Part 1: General requirements and tests (IEC 60598-1:2014)

101 EN 60622, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Sealed nickel-

102 cadmium prismatic rechargeable single cells

103 EN 60623, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Vented nickel-

104 cadmium prismatic rechargeable single cells (IEC 60623)

105 EN 60721-3-3, Classification of environmental conditions - Part 3: Classification of groups of environmental

106 parameters and their severities - Section 3: Stationary use at weatherprotected locations

107 EN 60896-11, Stationary lead-acid batteries - Part 11: Vented types - General requirements and methods of

108 tests

109 EN 60896-21:2004, Stationary lead-acid batteries - Part 21: Valve regulated types - Methods of test

110 EN 60896-22, Stationary lead-acid batteries - Part 22: Valve regulated types - Requirements

111 EN 60947-2, Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2)

112 EN 60947-3, Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-

113 disconnectors and fuse-combination units

114 EN 60947-4-1, Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters -

115 Electromechanical contactors and motor-starters

116 EN 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for industrial

117 environments

118 EN 61000-6-3, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission standard for

119 residential, commercial and light-industrial environments

120 EN 61000-6-4, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards - Emission standard for

121 industrial environments

122 EN 61032:1998, Protection of persons and equipment by enclosures - Probes for verification

123 EN 61558-2-4, Safety of transformers, reactors, power supply units and similar products for supply voltages

124 up to 1 100 V - Part 2-4: Particular requirements and tests for isolating transformers and power supply units

125 incorporating isolating transformers

126 EN 61558-2-6, Safety of transformers, reactors, power supply units and similar products for supply voltages

127 up to 1 100 V - Part 2-6: Particular requirements and tests for safety isolating transformers and power supply

128 units incorporating safety isolating transformers

129 EN 61558-2-16, Safety of transformers, reactors, power supply units and similar products for supply voltages

130 up to 1 100 V - Part 2-16: Particular requirements and tests for switch mode power supply units and

131 transformers for switch mode power supply units

132 EN 61951-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable

133 sealed rechargeable single cells – Part 1: Nickel-cadmium (IEC 61951-1)

134 EN 62034:2012, Automatic test systems for battery powered emergency escape lighting

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135 EN 62040-1, Uninterruptible power systems (UPS) - Part 1: General and safety requirements for UPS

136 (IEC 62040-1)

137 EN 62310-1, Static transfer systems (STS) - Part 1: General and safety requirements

138 EN 82079-1, Preparation of instructions for use - Structuring, content and presentation - Part 1: General

139 principles and detailed requirements
140 3 Terms and definitions

141 For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain

142 terminological databases for use in standardization at the following addresses:

143 • IEC Electropedia: available at http://www.electropedia.org/
144 • ISO Online browsing platform: available at http://www.iso.org/obp
145 3.1
146 automatic transfer switching device (ATSD)

147 device arranged to connect the emergency supply automatically to the essential safety equipment circuit(s)

148 on failure of the normal supply or to transfer the load from the normal supply to the battery

149 3.2
150 battery charger

151 part of the equipment that provides the charge to the battery from the normal supply

152 3.3
153 inverter
154 device for the conversion of direct current (DC) to alternating current (AC)
155 3.4
156 changeover mode

157 mode in which the emergency power supply source is kept on standby and will, in the event of a failure of the

158 normal supply, automatically be transferred to the essential safety equipment

159 3.5
160 converter
161 device for changing the voltage of a direct current supply
162 3.6
163 mode without interruption

164 mode in which the emergency power supply source operates in parallel to the normal supply, is connected to

165 the load and supplies power without interruption when the normal supply fails

166 3.7
167 control switch device (CSD)

168 device intended to automatically supply one or several circuits from the emergency power source on failure

169 of the normal supply. This device may be manually controlled as required by the application standard

170 Note 1 to entry: A CSD can be located inside or outside of the CPS
171 3.8
172 deep discharge protection device
173 device to protect the battery against deep discharge
174 3.9
175 rated supply voltage (mains input)

176 supply voltage or supply voltages assigned to the equipment by the manufacturer for the specified operating

177 conditions of the equipment
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178 3.10
179 rated output current (of a system)
180 current, in amperes, supplied by a system at nominal voltage
181 3.11
182 normal supply
183 source of electrical energy that is intended to provide normal power supply
184 3.12
185 rated operating time

186 design period of time during which the load can be supplied whilst the system stays within specified voltage

187 limits during mains failure
188 3.13
189 nominal battery voltage

190 suitable approximate voltage value of a system calculated using 2 V per cell for lead acid cells and 1,2 V per

191 cell for nickel cadmium cells
192 3.14
193 nominal system voltage
194 specified output voltage of a central safety power supply system
195 3.15
196 minimum voltage

197 voltage of the central safety power supply system at the end of the rated operating time

198 3.16
199 earth fault indication

200 device to indicate earth faults from either pole of the battery or from a load circuit if connected to the battery

201 3.17
202 mains failure indication
203 device to indicate failure of the normal supply
204 3.18
205 central safety power supply system (CPS system)

206 central power supply system which supplies the required power to essential safety equipment without any

207 restriction in power output
208 3.19
209 low power safety supply system (LPS system)

210 central power supply system where the power output is limited to 500 W for a duration of 3 h or to 1 500 W

211 for a duration of 1 h
212 3.20
213 essential safety equipment

214 devices required by the relevant authority to protect people in the event of a hazard

215 3.21
216 central inverter

217 inverter which supplies the total number of essential safety equipment circuit(s)

218 3.22
219 group inverter

220 inverter which supplies a part of the essential safety equipment installation, where the load connected to the

221 inverter is limited to a single
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222 3.23
223 expert for safety power supply systems

224 electrically skilled person with the relevant education to enable him or her, to install and to test a safety

225 power supply system and to ensure the functional capability of it, by consideration of the relevant standards,

226 building codes and manufacturer documentation
227 4 Operating modes of central safety power supply systems
228 4.1 General provisions

229 In order to comply with the different operating requirements of the essential safety equipment, various types

230 of central safety power supply systems are necessary.

231 This clause describes the basic modes of operation of central safety power supply systems and their

232 essential characteristics.

233 In general, two different modes of power supply are defined, the changeover mode and the mode without

234 interruption. The main difference is the response (changeover) time. In changeover mode, the response time

235 shall be no more than 0,5 s whereas, in the mode without interruption, the supply is permanent so, naturally,

236 there is no response time.

237 The load, the level of discharge and the capacity of the battery determine the rated operating time in the

238 case of a power failure. For application cases where the load requires an AC supply, an inverter shall be

239 used. For application cases where a DC supply is required, a direct current adjusted to the load shall be

240 supplied.
241 4.2 Changeover mode

242 In the changeover mode, the essential safety equipment shall be fed directly by normal supply (see

243 Figure 1). When the load voltage differs from the normal supply voltage, an isolating transformer shall be

244 used for supply matching. In the event of a mains power failure, the voltage monitor in the automatic transfer

245 switching device (ATSD) shall transfer the supply to the battery. A controlled battery charger shall be

246 provided for charging and float charging of the battery.
247
248 Figure 1
249 4.3 Mode without interruption

250 When in the mode without interruption, the battery charger shall be able to energize the essential safety

251 equipment and to ensure the charging and/or float charging of the battery (see Figure 2 and Figure 3).

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252
253 Figure 2
254
255 Figure 3

256 In the event of mains failure the battery shall take over the power supply to load without interruption, and the

257 battery shall be adequately rated to maintain the output voltage within limits compatible with the safety

258 equipment connected to the load.

259 4.4 Changeover mode with an additional control switching device for central switching of

260 the load

261 In addition to the devices detailed in 4.2, the equipment includes a control switch device(s) (CSD) which is

262 (are) activated automatically or manually and is (are) dependent upon normal supply being available. For

263 this, it shall be ensured that the emergency power supply is effective throughout the time required for

264 operation. (See Figure 4.)

265 A number of control switch devices may be used to switch sections of the load.

266
267 Figure 4

268 4.5 Changeover mode with additional control switching device for partial switching of the

269 load

270 In addition to the devices detailed in 4.2, the equipment includes a control switching device for the section-

271 wise switching of the loads which is activated by the normal supply (see 4.4).

272 However, deviating from the design specified in 4.4, part of the load is energised continuously (see Figure 5).

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273
274 Figure 5
275 4.6 Non-maintained changeover mode

276 In this case, the essential safety equipment is energised only in the event of normal supply failure. Differing

277 from the system defined in 4.3, a control switch device or several control switch devices is (are) used

278 additionally (see Figure 6)
279
280 Figure 6

281 4.7 Mode without interruption with an additional control switching device for central

282 switching of the load

283 In addition to the devices detailed in 4.3 the equipment includes a control switch device(s) (CSD) which is

284 manually activated or by the normal supply, in order to divide the loads on one part continuously energized

285 and a another part which can be disconnected.
286
287 Figure 7
288 5 Operating conditions and requirements

289 5.1 Normal operating conditions and requirements for central safety power supply

290 systems

291 Systems shall be suitable for use under at least the following conditions. Deviations from these conditions

292 shall be agreed on between user and manufacturer.

293 a) The system shall be designed for a rated supply voltage as specified in Table 1 of EN 60038:2011 and

294 for a maximum static voltage deviation of ± 10 %.

295 b) The system shall be designed for a maximum frequency deviation of the supply voltage of ± 4 %.

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296 c) The temperature range in which the system can be operated shall be declared and the equipment shall

297 be capable of operating without condensation in a relative humidity of 85 %.

298 NOTE 1 Working life and attainable capacity of the batteries are strongly dependent upon battery temperature.

299 d) The system shall be capable of operating without a reduction of efficiency at altitudes of up to 1 000 m

300 above sea level.

301 NOTE 2 For altitudes above 1 000 m the supplier has to provide on request derating factors

302 e) The battery shall be protected against deep discharge.

303 f) With regard to immunity to electromagnetic disturbance, the system shall comply with requirements for

304 the industry areas as specified in EN 61000-6-2, and for emitted electromagnetic interferences it shall

305 comply with the requirements for residential, business and commercial areas as well as small

306 enterprises as specified in EN 61000-6-3 or where the essential safety equipment is intended for

307 installation within an industrial environment, with the requirements as specified in EN 61000-6-4.

308 5.2 Requirements to be specified by the user
309 At least the following information shall be supplied to the manufacturer:

310 a) type and value of the rated supply voltage (mains input) and output voltage;

311 b) load profile over the rated operating time;

312 c) division of the load (continuous and stand-by operation), as far as required;

313 d) permissible changeover time in case of failure of the mains supply;
314 e) the rated operating time required;
315 f) type and intended position of the battery;

316 g) intended system configuration (type of system in accordance with Clause 4);

317 h) ambient temperature range and relative humidity if different from Class 3K3 (moderate climate) as

318 specified in EN 60721-3-3.

319 Additional load specific delay times may have to be taken into account at the design stage.

320 NOTE For standard CPS/LPS from the suppliers catalogue, these information can be predefined by the supplier, so

321 that the user can choose the suitable system for his needs.
322 6 Constructional design
323 6.1 Structure of enclosures
324 6.1.1 Enclosures shall have sufficient mechanical strength.
325 Compliance is checked by inspection and the following test:

326 A straight and un-jointed test finger is used with the same dimensions as the standard test finger specified in

327 EN 61032:1998, Figure 7, Test probe 11. The finger is pressed against the surface with a force of 30 N.

328 During the test, metal parts shall not touch live parts. After the test, covers shall not be excessively deformed

329 and the enclosure shall continue to meet the requirements of EN 60598
...

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