SIST EN 50171:2022
(Main)Central safety power supply systems
Central safety power supply systems
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.
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
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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
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
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
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).
— 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.
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)
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)
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
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
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
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).
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 %.
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
shall not be excessively deformed and the enclosure shall continue to meet the requirements of
EN 60598-1:2015, Clause 11.
6.2.2 Enclosures of the system shall have a degree of protection of at least IP 20.
6.2.3 Enclosures shall be resistant to heat and fire.
Plastic enclosures shall comply with EN 60598-1:2015, Clause 13 and withstand the test (glow-wire test)
specified in EN 60598-1:2015, 13.3.2, however at a test temperature of 850 °C.
NOTE Metal enclosures are deemed to comply with this requirement.
6.2.4 Doors and detachable covers shall be fastened so that access to dangerous live parts is not possible
without the use of a tool or key.
6.2.5 Devices within the enclosure shall be arranged so as to allow for maintenance and functional tests.
6.2.6 The wiring between component parts and equipment components shall be permanently marked.
6.2.7 According to EN 60598-1:2015, 5.3.2, wireways shall be smooth and free from sharp edges, burrs,
flashes, etc., in order to prevent damage to the insulation of the wiring parts. Metal screws shall not protrude
into wireways.
6.2.8 Enclosures housing batteries shall comply with the requirements of EN IEC 62485-2.
Compliance with the requirements of 6.2.4 to 6.2.8 is checked by inspection.
6.3 Battery chargers and rectifiers
6.3.1 Battery chargers and rectifiers shall comply with the relevant requirements of EN 60146-1-1 and
EN IEC 62485-2.
In addition to that, galvanic separation between input power supply and battery circuit shall be provided for.
6.3.2 The charging characteristics of battery chargers shall be designed so as to optimize the battery’s
useful life taking into consideration the data and recommendations of the battery manufacturer. Compatibility
with the inverter (if present) shall be ensured.
6.3.3 Battery chargers shall be capable of charging the discharged batteries automatically so that they can
operate for at least 80 % of their specified operating time after a charging period of 12 h.
NOTE 1 As a reference value for a battery with a rated capacity of 100 Ah, this is achieved using a charging current
of 10 A.
NOTE 2 The battery is expected to be discharged, when the battery was discharged to the rated operating time, with
the rated output power and/or to the minimum voltage.
Compliance is checked by carrying out the test given in 6.3.5.
For the mode without interruption where the load is supplied directly from the rectifier or from an inverter, the
nominal output current of the rectifier shall be equivalent to at least 120 % of the sum of (the rated current
delivered directly to the load OR the current to an inverter which is connected to the maximum rated load)
AND (a current of 0,1 A for each Ah of rated battery capacity).
Compliance is checked by inspection.
6.3.4 Where maintained loads are permanently connected in the mode without interruption, the design of
the battery charger shall be such that the voltage appearing at the output terminals does not exceed the
maximum permissible voltage of the loads.
6.3.5 Battery chargers shall provide their rated power over their designed ambient temperature range
when operating on mains supply voltage. Automatic compensation of battery charging voltage dependent on
temperature variations shall be provided for if required by the battery manufacturer.
Compliance is checked by inspection and by the following test:
The battery shall be charged for 36 h by application of the minimum rated input voltage to the battery charger
at nominal conditions. Immediately following the charge, the battery shall be discharged using the designed
load or resistive equivalent to provide rated current at the nominal battery voltage. The discharge shall be
continued for the specified duration of the equipment ensuring at the end of discharge that the battery
voltage provided is not less than the specified minimum voltage.
The battery shall be recharged at the minimum rated input voltage for 12 h at a room ambient temperature of
(20 ± 5)°C. Immediately following the recharge, the battery shall be discharged at rated current to 80 % of
rated duration period of the system at which time the battery voltage shall not be less than that specified.
Equipment that does not pass this test shall be retested. Equipment that does not pass the repeat test shall
be deemed not to comply.
6.3.6 The battery charger shall be so designed that a short circuit on its output does not cause damage.
Compliance is checked by disconnecting the battery and applying a short circuit to the battery charger
output. No damage other than response of the protective device(s) shall occur.
6.3.7 The superimposed alternating current of the battery charger shall not exceed the recommended limit
values given in Table 2 of EN IEC 62485-2:2018, 10.2.
6.4 Transformers
Transformers, if used, shall comply with either EN 61558-2-4, EN 61558-2-6 or EN 61558-2-16.
6.5 Switchgear and controlgear
6.5.1 Automatic transfer switching devices and electronic devices of equivalent nature shall conform to
EN 60947-4-1 and / or EN 62310-1 if applicable and shall be of the appropriate category for the load.
Switchover from normal operation to the current source for safety purposes shall be compatible with the load
equipment and shall occur if a mains voltage lower than 0,85 times the rated voltage occurs for periods
longer than 0,5 s. Switchback is to be inhibited until the mains voltage value has risen above the switchover
voltage by a hysteresis margin compatible with the switching operation and the load equipment. A
switchback delay of at least 1 min can be included if required.
An adequate hysteresis should be considered to avoid repetitive switching sequences.
For emergency lighting the transfer time of the transfer switching device should be considered for the
fulfilment of the illuminance requirements of EN 1838. The system designer should ensure that these times
are adhered.
NOTE It is expected to be ensured that the condition of changeover (voltage level and switch over time) are
compatible with the connected load.
6.5.2 Input circuit breakers shall comply with EN 60947-2 and with regard to protection against accidental
contact they shall comply with EN 50274.
6.5.3 Any switch or control equipment used to change the characteristics of the battery charger for the
boost or commissioning level shall be either of the lockable type or shall be fitted inside the enclosure and
shall not be accessible without the use of, e.g. a tool, key, or electronic code.
6.5.4 If a bus control is used for the function of the central safety power supply system, all emergency or
safety luminaires, which are affected in the event of a bus failure, shall be switched on.
Compliance with the requirements of 6.5.1 to 6.5.4 is checked by inspection and measurement.
6.6 Central inverters/group inverters/converters
6.6.1 Central inverters, their batteries, chargers, and associated controlgear shall be designed so that they
form a compatible system with regard to frequency, voltage waveform, load capacity, and performance
factors.
6.6.2 The output voltage of central inverters shall match the load requirement and be regulated
within ± 6 % of the system’s nominal voltage from 20 % to 100 % of the load conditions throughout the rated
discharge period. For instantaneous load changes, the output voltage is allowed to vary within ± 10 % for up
to 5 s.
6.6.3 Central inverters shall be able to continuously withstand 120 % of the load requirements throughout
the rated operating time.
In addition to that, inverters shall be able to start the full load of a previously unpowered system in the mains
failure mode of operation within the response time specified in EN 1838.
6.6.4 Central inverters with sinusoidal output parameters shall have a maximum total harmonic distortion
of 5 % when measured with linear load.
6.6.5 Central inverters shall have a frequency matching the load with a maximum of 500 Hz and a
maximum deviation of ± 2 % from the nominal frequency over the required battery voltage and load range.
6.6.6 The central inverter shall be protected against damage to components other than fuse links or similar
protective devices as could be caused by reversal of the battery polarity.
6.6.7 The central inverter shall be protected by fuse links or other protective devices against component
damage from short circuit at the AC output terminations.
Compliance with the requirements of 6.6.1 to 6.6.7 is checked by inspection, measurement, and appropriate
tests.
6.6.8 The central inverter shall be capable of tripping any associated protective device installed in final
circuits or distribution circuits without shutting down the device or rupturing its output protective device.
Inverters shall recover to the intended normal output voltage automatically within 5 s of the fault being
cleared. The size and type of fuse(s) or protective equipment installed in the distribution system shall be
specified by the manufacturer.
It shall be ensured that a failure in one of multiple output circuits does not lead to a failure of any of the other
output circuits (see also HD 60364-5-56:2018, 560.7.4).
Compliance is checked by the following test:
A fuse or protective device of the maximum declared value shall be connected across the output terminals.
The inverter shall then be switched on and the fuse or protective device shall operate without damage to the
inverter, which shall resume its full output voltage within 5 s.
6.6.9 Group inverters with an output current not exceeding 6 A are permitted to have a non-sinusoidal
output voltage. The non-sinusoidal voltage shall match the connected loads. Group inverters shall also meet
the requirements of 6.6.6 and 6.6.7.
6.6.10 Converters for the supply of DC loads with direct voltages differing from the battery voltage are
permitted to be used for a maximum output power of 1 000 VA. The output voltage shall be adjusted to the
loads. Converters shall also meet the requirements of 6.6.6 and 6.6.7.
6.6.11 Where a UPS system is used to feed the essential safety systems, it shall comply with EN 62040-1
and the additional requirements of this document.
The UPS manufacturer offering a system for use as a Central safety power supply systems shall be able to
provide the maximum fault clearance capabilities and overload characteristics for sizing/design of the
electrical distribution system to essential safety equipment when operating in emergency mode and without
the use of a by-pass supply (see 6.6.8).
6.6.12 The AC current ripple through the battery, caused by an inverter, shall not be more than 5A per 100
Ah rated capacity of the battery. If the battery manufacturer has made recommendations about the maximum
ripple current, the maximum ripple current shall not be higher than the recommendation.
6.7 Deep discharge protection
For the protection of the battery and the automatic switching device, a deep discharge protective device is to
be provided which shall comply with the following requirements:
a) the minimum operating voltage of the deep discharge protection shall comply with the specifications of
the battery manufacturer;
NOTE Typical values are 0,9 V/cell for nickel-cadmium and 1,6 V/cell for lead acid batteries.
b) the discharge current from the battery shall not exceed 0,2 A per 100 Ah of the rated capacity of the
battery following the activation of the deep discharge protection device;
c) activation of the deep discharge protection shall be indicated on the safety power supply control panel;
d) restoration of the normal supply shall automatically reinstate charging;
e) the deep discharge monitor operation shall only be reset manually and after restoration of the normal
supply;
Automatic reset is not permitted in order to point out to the user the risk of a battery that might not be
sufficiently charged for operation.
f) no additional switchgear shall be used in the battery circuit in order to separate the essential safety
equipment from the battery.
Compliance is checked by operation measurement and visual inspection.
6.8 Monitoring and display equipment
6.8.1 The central safety power supply system shall include equipment for monitoring the system function.
The following values shall be measured:
— battery voltage;
— battery/charger/discharge current;
— total load current (in the mode without interruption);
— output current of the charger (in the mode without interruption).
6.8.2 The following test and monitoring equipment shall be provided:
a) devices with automatic reset, e.g. push button, to simulate a normal supply failure;
b) a device to deactivate the charging unit during the duration test, which shall not be accessible without
the use of, e.g. a tool, key, or electronic code. If applicable the device shall comply with EN 60947-3;
c) indication of the actual power supply source (normal supply or battery);
d) indication of the following fault and system conditions:
— float charge voltage (trickle charge current for nickel-cadmium battery) outside the permissible
range;
— interruption of the battery charging circuit;
— fault in the charging equipment; no charging current, although normal supply is available;
— feeding from the battery, although the normal supply is available;
— deep discharge protection initiated.
If any of the following devices are present, their operation shall be indicated:
— operation of the insulation monitoring device (earth fault indicator);
— failure of the ventilation system for battery cabinets or battery compartments;
e) equipment for the remote indication of the following visual display units using potential-free contacts
shall be provided for:
— system ready-to-operate;
— supply from the battery;
— system fault : combined fault indications (e.g. item d).
It is preferable to use circuits operating in accordance with the closed-circuit principle for combined fault
indications.
An audible alarm may be provided in addition. The alarm should be repeated periodically.
NOTE The system is ready to operate, if either the charger does charge the battery or the battery is fully charged
and there is no fault, which would prevent to feed the load from the battery.
Where equipment for remote monitoring, indication or an automatic testing system for the individual alarms is
incorporated as part of the system; critical faults to the central safety power supply system representing a
total system failure should be indicated
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