kSIST FprEN 50171:2015

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. Combination of the aforementioned equipment types should not be mixed together on the same central safety power supply system. 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 are excluded.

Zentrale Sicherheitsstromversorgungssysteme

Systèmes d'alimentation à source centrale

La présente Norme européenne définit les exigences générales relatives aux systèmes d'alimentation à source centrale des équipements spécifiques de sécurité. Elle 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 des batteries d'accumulateurs. 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 convient qu'un même système d'alimentation de sécurité à source centrale n'alimente pas plusieurs des types d'équipements mentionnés ci-dessus. Des représentations, sous forme de schémas, d’équipements typiques d'alimentation à source centrale figurent à l'Article 4.  Les systèmes d’alimentation des systèmes d’alarme incendie couverts par l’EN 54 sont exclus.

Centralni varnostni napajalni sistemi

General Information

• Status: Not Published
• Public Enquiry End Date: 24-Sep-2013
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 23-Jan-2020
• Due Date: 28-Jan-2020
• Completion Date: 23-Jan-2020
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: FprEN 50171:2015 - Central safety power supply systems

Relations

• Replaces: SIST EN 50171:2002 - Central power supply systems
• Effective Date: 06-Sep-2011
• Revises: SIST EN 50171:2002 - Central power supply systems
• Effective Date: 29-Jan-2023
• Revised: SIST EN 50171:2002 - Central power supply systems
• Effective Date: 07-Jun-2022
• Revised: SIST EN 50171:2002 - Central power supply systems
• Effective Date: 06-May-2014

Overview

FprEN 50171:2015 - Central safety power supply systems (CLC) defines general requirements for central power supply systems (CPS) that provide an independent energy source to essential safety equipment. The standard applies to systems permanently connected to AC supplies up to 1 000 V that use batteries as an alternative power source. Its main purpose is to ensure reliable energy for emergency escape lighting and other essential safety installations during normal supply failure. Systems covered exclude fire alarm power supplies already covered by EN 54.

Key topics and technical requirements

• System scope and definitions: terms such as CPS, low power safety supply (LPS), rated operating time, nominal system voltage, minimum voltage, ATSD (automatic transfer switching device), inverter, converter and control switch device are defined.
• Operating modes:
  • Changeover mode - emergency source on standby; automatic transfer on mains failure (response time ≤ 0.5 s).
  • Mode without interruption - emergency source operates in parallel with normal supply; no interruption on failure.
• Battery requirements: batteries are central to the design; nominal cell voltages (2 V per lead‑acid cell, 1.2 V per Ni‑Cd cell) are used to calculate nominal battery voltage. Deep discharge protection, installation, maintenance and recurring tests are specified.
• Power limits and classifications: LPS examples (e.g., limited to 500 W for 3 h or 1 500 W for 1 h) and definitions for central versus group inverters.
• Equipment and safety design: requirements for battery chargers/rectifiers, transformers, switchgear/controlgear, inverters/converters, fusing, protection against electric shock, monitoring and display equipment, earth‑fault and mains‑failure indication.
• Testing and documentation: initial type tests, pre‑commissioning and recurring tests, system testing guidance and mandatory documentation for installation and operation.

Applications and who uses it

This standard is intended for:

• Manufacturers of central safety power supply systems and components (inverters, battery chargers, ATSDs).
• Electrical design engineers and building services consultants specifying emergency power for escape lighting, smoke extraction, paging/signalling, CO warning systems and specific high‑risk building installations.
• Installers, commissioning engineers and maintenance teams performing tests, recurring inspections and battery maintenance.
• Safety managers and authorities specifying compliance for essential safety equipment.

Related standards

• EN 1838 (Emergency lighting)
• EN 50272-2 (Stationary batteries)
• EN 62040-1 (UPS safety)
• EN 60598-1 (Luminaires)
• Note: EN 54 (fire alarm power supplies) is explicitly excluded.

Keywords: central safety power supply systems, CPS, emergency escape lighting, battery backup, changeover mode, inverter, ATSD, FprEN 50171:2015.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 50171:2013
01-september-2013
1DGRPHãþD
SIST EN 50171:2002
Centralni varnostni napajalni sistemi
Central safety power supply systems
Zentrale Sicherheitsstromversorgungssysteme
Systèmes d'alimentation à source centrale
Ta slovenski standard je istoveten z: prEN 50171:2013
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
oSIST prEN 50171:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50171:2013
oSIST prEN 50171:2013
DRAFT
EUROPEAN STANDARD
prEN 50171
NORME EUROPÉENNE
May 2013
EUROPÄISCHE NORM
ICS Will supersede EN 50171:2001 + corr. Aug.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 CENELEC enquiry.
Deadline for CENELEC: 2013-10-25.

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, 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.

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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 23607 Ref. No. prEN 50171:2013 E

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1 Contents
2 Foreword . 4
3 1 Scope . 5
4 2 Normative references . 5
5 3 Terms and definitions . 6
6 4 Types of central safety power supply systems . 8
7 4.1 General provisions . 8
8 4.2 Changeover mode . 8
9 4.3 Parallel standby mode . 8
10 4.4 Changeover mode with an additional control switching device for central switching of the
11 load . 9
12 Changeover mode with additional control switching device for partial switching of the load . 9
4.5
13 4.6 Non-maintained changeover mode . 10
14 5 Operating conditions and requirements . 10
15 5.1 Normal operating conditions and requirements for central safety power supply systems . 10
16 5.2 Requirements to be specified by the user . 10
17 6 Constructional design . 11
18 6.1 Structure of enclosures . 11
19 6.2 Battery chargers and rectifiers . 11
20 6.3 Transformers . 12
21 6.4 Switchgear and controlgear . 12
22 6.5 Central inverters/group inverters/converters . 12
23 6.6 Deep discharge protection . 14
24 6.7 Monitoring and display equipment . 14
25 6.8 Fuses, protective devices and measuring instruments . 15
26 Internal wiring . 15
6.9
27 6.10 Electric strength . 16
28 6.11 Recurring tests . 16
29 6.12 Batteries . 17
30 6.13 Battery installation and provisions for maintenance . 18
31 6.14 Equipment marking . 18
32 6.15 Warning labels . 20
33 7 Information for installation and operation of central safety power supply systems . 20
34 7.1 Documentation . 20
35 7.2 Initial type test. 20
36 7.3 Recurring tests . 21
37 8 Tests . 21
38 8.1 General . 21
39 8.2 Tests required before commissioning . 21
40 8.3 Recurring tests . 23
41 Annex A (informative) System testing . 24

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42 Figures
43 Figure 1 . 8
44 Figure 2 . 9
45 Figure 3 . 9
46 Figure 4 . 9
47 Figure 5 . 10
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49 Foreword
50 This document (prEN 50171:2013) has been prepared by CLC/TC 22X "Power electronics".
51 This document is currently submitted to the Enquiry.
52 This document will supersede EN 50171:2001 + corrigendum August 2001.
53 This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for
54 Use within Certain Voltage Limits (LVD - 2006/95/EC).

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55 1 Scope
56 This European Standard specifies the general requirements for central power supply systems for an
57 independent energy supply to essential safety equipment. This standard covers systems that are
58 permanently connected to AC supply voltages not exceeding 1 000 V and use batteries as an alternative
59 power source.
60 Central safety power supply systems are intended to ensure energy supply to emergency escape lighting in
61 the event of normal supply failure and may be suitable for energising other essential safety equipment, for
62 example:
63 – electric circuits of automatic fire extinguishing installations;
64 – paging systems and signalling safety installations;
65 – smoke extraction equipment;
66 – carbon monoxide warning systems;
67 – special safety installations related to specific buildings, e.g. high-risk areas.
68 Combination of the aforementioned equipment types should not be mixed together on the same central
69 safety power supply system.
70 Schematic representations of typical central safety power supply equipment are depicted in Clause 4.
71 Power supply systems for fire alarm equipment that are covered by EN 54 are excluded.
72 2 Normative references
73 The following documents, in whole or in part, are normatively referenced in this document and are
74 indispensable for its application. For dated references, only the edition cited applies. For undated references,
75 the latest edition of the referenced document (including any amendments) applies.
76 EN 1838, Lighting applications – Emergency lighting
77 EN 50272-2:2001, Safety requirements for secondary batteries and battery installations – Part 2: Stationary
78 batteries
79 EN 50274, Low-voltage switchgear and controlgear assemblies – Protection against electric shock –
80 Protection against unintentional direct contact with hazardous live parts
81 EN 60051 (series), Direct acting indicating analogue electrical measuring instruments and their accessories
82 EN 60146-1-1, Semiconductor converters – General requirements and line commutated converters –
83 Part 1-1: Specification of basic requirements
84 EN 61951-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable
85 sealed rechargeable single cells – Part 1: Nickel-cadmium
86 EN 60417 (series), Graphical symbols for use on equipment
87 EN 60598-1, Luminaires – Part 1: General requirements and tests (IEC 60598-1, modified)
88 EN 60622, Sealed nickel-cadmium prismatic rechargeable single cells
89 EN 60623, Vented nickel-cadmium prismatic rechargeable single cells
90 EN 60721-3-3, Classification of environmental conditions – Part 3: Classification of groups of environmental
91 parameters and their severities – Section 3: Stationary use at weatherprotected locations
92 EN 60896-11, Stationary lead-acid batteries – Part 11: Vented types – General requirements and methods of
93 test
94 EN 60896-21, Stationary lead-acid batteries – Part 21: Valve regulated types – Methods of test

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95 EN 60896-22, Stationary lead-acid batteries – Part 22: Valve regulated types – Requirements
96 EN 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
97 EN 60947-4-1, Low-voltage switchgear and controlgear – Part 4-1: Contactors and motor-starters – Electro-
98 mechanical contactors and motor-starters
99 EN 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial
100 environments
101 EN 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards – Emission standard for
102 residential, commercial and light-industrial environments
103 EN 61032:1998, Protection of persons and equipment by enclosures – Probes for verification
104 EN 61558-2-4, Safety of transformers, reactors, power supply units and similar products for supply voltages
105 up to 1 100 V – Part 2-4: Particular requirements and tests for isolating transformers and power supply units
106 incorporating safety isolating transformers
107 EN 62040-1, Uninterruptible power systems (UPS) - Part 1: General and safety requirements for UPS
108 EN 62079, Preparation of instructions – Structuring, content and presentation
109 EN 50525-2-31, Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V
110 (U0/U) - Part 2-31: Cables for general applications - Single core non-sheathed cables with thermoplastic
111 PVC insulation
112 EN 60038, CENELEC standard voltages
113 HD 60364-6:2007, Erection of low-voltage installations – Part 6: Verification
114 3 Terms and definitions
115 For the purposes of this document, the following terms and definitions apply.
116 3.1
117 automatic transfer switching device (ATSD)
118 device arranged to connect the emergency supply automatically to the essential safety equipment circuit(s)
119 on failure of the normal supply or to transfer the load from the normal supply to the battery
120 3.2
121 battery charger
122 part of the equipment that provides the charge to the battery from the normal supply
123 3.3
124 Inverter
125 device for the conversion of direct current (DC) to alternating current (AC)
126 3.4
127 changeover mode
128 mode in which the emergency power supply source is kept on standby and will, in the event of a failure of the
129 normal supply, automatically be transferred to the essential safety equipment
130 3.5
131 converter
132 device for changing the voltage of a direct current supply
133 3.6
134 mode without interruption
135 mode in which the emergency power supply source operates in parallel to the normal supply, is connected to
136 the load and supplies power without interruption when the normal supply fails

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137 3.7
138 control switch device (CSD)
139 device intended to automatically supply one or several circuits from the emergency power source on failure
140 of the normal supply. This device may be manually controlled as required by the application standard
141 3.8
142 deep discharge protection device
143 device to protect the battery against deep discharge
144 3.9
145 rated supply voltage (mains input)
146 supply voltage or supply voltages assigned to the equipment by the manufacturer for the specified operating
147 conditions of the equipment
148 3.10
149 rated output current (of a system)
150 current, in amperes, supplied by a system at nominal voltage
151 3.11
152 normal supply
153 source of electrical energy that is intended to provide normal power supply
154 3.12
155 rated operating time
156 design period of time during which the load can be supplied whilst the system stays within specified voltage
157 limits
158 3.13
159 nominal battery voltage
160 suitable approximate voltage value of a system calculated using 2 V per cell for lead acid cells and 1,2 V per
161 cell for nickel cadmium cells
162 3.14
163 nominal system voltage
164 specified output voltage of a central safety power supply system
165 3.15
166 minimum voltage
167 voltage of the central safety power supply system at the end of the rated operating time
168 3.16
169 earth fault indication
170 device to indicate earth faults from either pole of the battery or from a load circuit if connected to the battery
171 3.17
172 mains failure indication
173 device to indicate failure of the normal supply
174 3.18
175 central safety power supply system (CPS system)
176 central power supply system which supplies the required power to essential safety equipment without any
177 restriction in power output
178 3.19
179 low power safety supply system (LPS system)
180 central power supply system where the power output is limited to 500 W for a duration of 3 h or to 1 500 W
181 for a duration of 1 h
182 3.20
183 essential safety equipment
184 devices required by the relevant authority to protect people in the event of a hazard

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185 3.21
186 central inverter
187 inverter which supplies the total number of essential safety equipment circuit(s)
188 3.22
189 group inverter
190 inverter which supplies a part of the essential safety equipment circuit(s)
191 4 Types of central safety power supply systems
192 4.1 General provisions
193 In order to comply with the different operating requirements of the essential safety equipment, various types
194 of central safety power supply systems are necessary.
195 This clause describes the basic types and their essential characteristics.
196 In general, two different modes of power supply are defined, i.e. the changeover mode and the mode without
197 interruption. The main difference is the response (changeover) time. In changeover mode, the response time
198 shall be no more than 0,5 s whereas, in the mode without interruption, the supply is permanent so, naturally,
199 there is no response time.
200 The load, the level of discharge and the capacity of the battery determine the rated operating time in the
201 case of a power failure. For application cases where the load requires an AC supply, an inverter shall be
202 used. For application cases where a DC supply is required, a direct current adjusted to the load shall be
203 supplied.
204 4.2 Changeover mode
205 In the changeover mode, the essential safety equipment shall be fed directly by the power supply system
206 (see Figure 1). When the load voltage differs from the normal supply voltage, an isolating transformer shall
207 be used for supply matching. In the event of a mains power failure, the voltage monitor in the automatic
208 transfer switching device (ATSD) shall transfer the supply to the battery. A controlled battery charger shall be
209 provided for charging and float charging of the battery.
211 Figure 1
212 4.3 Parallel standby mode
213 When in the mode without interruption, the charger shall be able to energise the essential safety equipment
214 and to ensure the charging and/or float charging of the battery (see Figure 2).

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216 Figure 2
217 In the event of a mains failure, the battery shall take over the power supply to the load without interruption or
218 decay in output voltage. See section 6.5.11.
219 4.4 Changeover mode with an additional control switching device for central switching of
220 the load
221 In addition to the devices detailed in 4.2, the equipment includes a control switch device(s) (CSD) which is
222 (are) activated automatically or manually and is (are) dependent upon normal supply being available. For
223 this, it shall be ensured that the emergency power supply is effective throughout the time required for
224 operation.
225 A number of control switch devices may be used to switch sections of the load.
227 Figure 3
228 4.5 Changeover mode with additional control switching device for partial switching of the
229 load
230 In addition to the devices detailed in 4.2, the equipment includes a control switching device for the section-
231 wise switching of the loads which is activated by the normal supply (see 4.4).
232 However, deviating from the design specified in 4.4, part of the load is energised continuously (see Figure 4).
234 Figure 4
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235 4.6 Non-maintained changeover mode
236 In this case, the essential safety equipment is energised only in the event of normal supply failure. Differing
237 from the system defined in 4.3, a control switch device or several control switch devices is (are) used addi-
238 tionally (see Figure 5)
240 Figure 5
241 5 Operating conditions and requirements
242 5.1 Normal operating conditions and requirements for central safety power supply
243 systems
244 Systems shall be suitable for use under at least the following conditions. Deviations from these conditions
245 shall be agreed on between user and manufacturer.
246 a) The system shall be designed for a rated supply voltage as specified in Table 1 of EN 60038 and for a
247 maximum static voltage deviation of ± 10 %.
248 b) The system shall be designed for a maximum frequency deviation of the supply voltage of ± 4 %.
249 c) The temperature range in which the system can be operated shall be declared and the equipment shall
250 be capable of operating without condensation in a relative humidity of 85 %.
251 NOTE Working life and attainable capacity of the batteries are strongly dependent upon battery temperature.
252 d) The system shall be capable of operating without a reduction of efficiency at altitudes of up to 1 000 m
253 above sea level.
254 e) The battery shall be protected against deep discharge.
255 f) With regard to immunity to electromagnetic disturbance, the system shall comply with requirements for
256 the industry areas as specified in EN 61000-6-2, and for emitted electromagnetic interferences it shall
257 comply with the requirements for residential, business and commercial areas as well as small
258 enterprises as specified in EN 61000-6-3.
259 5.2 Requirements to be specified by the user
260 At least the following information shall be supplied to the manufacturer:
261 a) type and value of the rated supply voltage (mains input) and output voltage;
262 b) load profile over the rated operating time;
263 c) division of the load (continuous and stand-by operation), as far as required;
264 d) permissible transfer time in case of failure of the mains supply;
265 e) the rated operating time required;
266 f) type and intended position of the battery;
267 g) intended system configuration (type of system in accordance with Clause 4);
268 h) ambient temperature range and relative humidity if different from Class 3K3 (moderate climate) as
269 specified in EN 60721-3-3.
270 Additional load specific delay times may have to be taken into account at the design stage.

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271 6 Constructional design
272 6.1 Structure of enclosures
273 6.1.1 Enclosures shall have sufficient mechanical strength.
274 Compliance is checked by inspection and the following test:
275 A straight and un-jointed test finger is used with the same dimensions as the standard test finger specified in
276 EN 61032:1998, Figure 7 – Test probe 11. The finger is pressed against the surface with a force of 30 N.
277 During the test, metal parts shall not touch live parts. After the test, covers shall not be excessively deformed
278 and the enclosure shall continue to meet the requirements of EN 60598-1, Section 11.
279 6.1.2 Enclosures of the system shall have degrees of protection of at least IP 20.
280 6.1.3 Enclosures shall be resistant to heat and fire.
281 Plastic enclosures shall comply with the regulation EN 60598-1, Section 13 and withstand the test (glowing
282 mandrel test) specified in EN 60598-1, 13.3.2, however at a test temperature of 850 °C.
283 NOTE Metal enclosures are deemed to comply with this requirement.
284 6.1.4 Doors and detachable covers shall be fastened so that access to dangerous live parts is not
285 possible without the use of a tool or key.
286 6.1.5 Devices within the enclosure shall be arranged so as to allow for maintenance and functional tests.
287 6.1.6 The wiring between component parts and equipment components shall be permanently marked.
288 6.1.7 According to EN 60598-1, 5.3.2, wireways shall be smooth and free from sharp edges, burrs,
289 flashes, etc., in order to prevent damage to the insulation of the wiring parts. Metal screws shall not protrude
290 into wireways.
291 6.1.8 Enclosures housing batteries shall comply with the requirements of EN 50272-2.
292 Compliance with the requirements of 6.1.4 to 6.1.8 is checked by inspection.
293 6.2 Battery chargers and rectifiers
294 Battery chargers and rectifiers shall comply with the following requirements:
295 6.2.1 Battery chargers and rectifiers shall comply with the relevant requirements of EN 60146-1-1 and
296 EN 50272-2.
297 In addition to that, galvanic separation between input power supply and battery circuit shall be provided for.
298 6.2.2 The charging characteristics of battery chargers shall be designed so as to optimise the battery’s
299 useful life taking into consideration the data and recommendations of the battery manufacturer. Compatibility
300 with the inverter (if present) shall be ensured
301 6.2.3 Battery chargers shall be capable of charging the discharged batteries automatically so that they
302 can operate for at least 80 % of their specified operating time after a charging period of 12 h.
303 NOTE As a reference value for a battery with a rated capacity of 100 Ah, this is to be achieved using a charging
304 current of 10 A.
305 For the mode without interruption where the load is supplied from the charger, the nominal output current of
306 the charger shall be equivalent to at least 110 % of the sum of the rated current delivered to the load and the
307 current delivered to the battery.
308 Compliance is checked by carrying out the test given in 6.2.5.

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309 6.2.4 Where maintained loads are permanently connected in the mode without interruption, the design of
310 the battery charger shall be such that the voltage appearing at the output terminals does not exceed the
311 maximum permissible voltage of the loads.
312 6.2.5 Battery chargers shall provide their rated power over their designed ambient temperature range
313 when operating on mains supply voltage. Automatic compensation of battery charging voltage dependent on
314 temperature variations shall be provided for if required by the battery manufacturer.
315 Compliance is checked by inspection.
316 6.2.6 The battery charger shall be so designed that a short circuit on its output does not cause damage.
317 Compliance is checked by disconnecting the battery and applying a short circuit to the battery charger
318 output. No damage other than response of the protective device(s) shall occur.
319 6.2.7 The superimposed alternating current of the battery charger shall not exceed the recommended
320 limit values given in Table 2 of EN 50272-2, 11.2.
321 6.3 Transformers
322 Transformers, if used, shall comply with EN 61558-2-4.
323 For equipment requiring transformers outside the scope of EN 61558-2-4, specific requirements should be
324 agreed on between supplier and user, however, the same level of safety should be maintained.
325 6.4 Switchgear and controlgear
326 6.4.1 Automatic transfer switching devices and electronic devices of equivalent nature shall conform to
327 EN 60947-4-1 if applicable and shall be of the appropriate category for the load.
328 Switchover from normal operation to the current source for safety purposes shall occur when mains voltages
329 of less than 0,85 times the rated voltage occur for periods longer than 0,5 s. Switchback is required for
330 values of more than 0,85 times the rated voltage with a switchback delay of 1 min.
331 The transfer time of the transfer switching device is part of the start up requirements of EN 1838 and the
332 system designer should ensure that these times are adhered to.
333 NOTE The level of changeover depends on the equipment used for safety services.
334 6.4.2 Input circuit breakers shall comply with EN 60947 and with regard to protection against accidental
335 contact they shall comply with EN 50274.
336 6.4.3 Any switch or control equipment used to change the characteristics of the battery charger for the
337 boost or commissioning level shall be either of the lockable type or shall be fitted inside the enclosure and
338 shall not be accessible without the use of, e.g., a tool, key, or electronic code.
339 6.4.4 If a bus control is used to ensure functioning of the installation, all emergency and safety luminaires
340 shall switch on in the event of a bus failure.
341 Compliance with the requirements of 6.4.1 to 6.4.4 is checked by inspection and measurement.
342 6.5 Central inverters/group inverters/converters
343 Central inverters shall comply with the following requirements:
344 6.5.1 Central inverters, their batteries, chargers, and associated controlgear shall be designed so that
345 they form a compatible system with regard to frequency, voltage waveform, load capacity, and performance
346 factors.
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347 6.5.2 The output voltage of central inverters shall match the load requirement and be regulated within
348 ± 6 % of the system’s nominal voltage from 20 % to 100 % of the load conditions throughout the rated
349 discharge period. For instantaneous load changes, the output voltage may be allowed to vary within ± 10%
350 for up to 5 s.
351 6.5.3 Central inverters shall be able to continuously withstand 120 % of the load requirements throughout
352 the rated operating time.
353 In addition to that, inverters shall be able to start the full load of a previously unpowered system in the mains
354 failure mode of operation within the response time specified in EN 1838.
355 6.5.4 Central inverters with sinusoidal output parameters shall have a maximum total harmonic distortion
356 of 5 % when measured with linear load.
357 6.5.5 Central inverters shall have a frequency matching the load with a maximum of 500 Hz and a
358 maximum deviation of ± 2 % from the nominal frequency over the required battery voltage and load range.
359 6.5.6 The central inverter shall be protected against damage to components other than fuse links or
360 similar protective devices as may be caused by reversal of the battery polarity.
361 6.5.7 The central inverter shall be protected by fuse links or other protective devices against component
362 damage from short circuit at the AC output terminations.
363 Compliance with the requirements of 6.5.1 to 6.5.7 is checked by inspection, measurement, and appropriate
364 tests.
365 6.5.8 The central inverter shall be capable of tripping any associated fuse installed in final circuits or
366 distribution circuits without shutting down the device or rupturing its output fuse. Inverters shall recover to the
367 intended normal output voltage automatically within 5 s of the fault being cleared. The size and type of
368 fuse(s) or protective equipment installed in the distribution system shall be specified by the manufacturer.
369 Compliance is checked by the following test:
370 A fuse or protective device of the maximum declared value shall be connected across the output terminals.
371 The inverter shall then be switched on and the fuse or protective device shall operate without damage to the
372 inverter, which shall resume its full output voltage within 5 s.
373 6.5.9 Group inverters with an output current not exceeding 6 A are permitted to have a non-sinusoidal
374 output voltage. The non-sinusoidal voltage shall match the connected loads. Group inverters shall also meet
375 the requirements of 6.5.6 and 6.5.7.
376 6.5.10 Converters for the supply of DC loads with direct voltages differing from the battery voltage are
377 permitted to be used for a maximum output power of 1 000 VA. The output voltage shall be adjusted to the
378 loads. Converters shall also meet the requirements of 6.5.6 and 6.5.7.
379 6.5.11 Where a UPS system is used to feed these essential safety systems, it shall comply with
380 EN 62040-1 and the additional requirements of this standard:
381 - consideration should be given to battery life expectancy when operating in parallel standby mode which
382 can reduce battery lifetime. (see section 6.12);
383 - the UPS manufacturer offering a system for use as a Central safety power supply systems shall be able
384 to provide the maximum fault clearance capabilities and overload characteristics for sizing/design of the
385 electrical distribution system to essential safety equipment when operating in emergency mode and
386 without the use of a by-pass supply (see section 6.5.8).

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387 6.6 Deep discharge protection
388 For the protection of the battery and the automatic switching device, a deep discharge protective device is to
389 be provided which shall comply with the following requirements:
390 a) the minimum operating voltage of the deep discharge protection shall comply with the specifications of
391 the battery manufacturer;
392 NOTE 1 Typical values are 0,9 V/cell for nickel-cadmium and 1,6 V/cell for lead acid batteries.
393 b) the discharge current from the battery shall not exceed 0,2 A per 100 Ah of the rated capacity of the
394 battery following the activation of the deep discharge protection device;
395 c) activation of the deep discharge protection shall be indicated on the safety power supply control panel;
396 d) restoration of the normal supply shall automatically reinstate charging;
397 e) the deep discharge monitor operation shall only be reset manually and after restoration of the normal
398 supply;
399 NOTE 2 Automatic reset is not permitted in order to point out to the user the risk of a battery that may not be
400 sufficiently charged for operation.
401 f) no additional switchgear shall be used in the battery circuit in order to separate the essential safety
402 equipment from the battery.
403 Compliance is checked by operation measurement and visual inspection.
404 6.7 Monitoring and display equipment
405 6.7.1 The central safety power supply system shall include equipment for monitoring the system function.
406 The following values shall be measured:
407 – battery voltage;
408 – battery/charger/discharge current;
409 – total load current (in the parallel standby mode);
410 – output current of the charger (in the parallel standby mode).
411 6.7.2 The following test and monitoring equipment shall be provided:
412 a) devices with automatic reset, e.g. push button, to simulate a normal supply failure;
413 b) a separator to isolate the AC supply for checking the operating time of the system;
414 c) indication of the actual power supply source (normal supply or battery);
415 d) indication of the following fault and system conditions:
416 – float charge voltage (trickle charge current for nickel-cadmium battery) outside the permissible
417 range;
418 – interruption of the battery charging circuit;
419 – fault in the charging equipment; no charging current, although normal supply is available;
420 – feeding from the battery, although the normal supply is available;
421 – deep discharge protection initiated.
422 If any of the following devices are present, their operation shall be indicated:
423 – operation of the insulation monitoring device (earth fault indicator);
424 – failure of the ventilation system for battery cabinets or battery compartments;

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425 e) equipment for the remote indication of the following visual display units using potential-free contacts
426 shall be provided for
427 – system ready-to-operate,
428 – supply from the battery,
429 – system fault : combined fault indications (e.g. item d),
430 It is preferable to use circuits operating in accordance with the closed-circuit principle for combined fault
431 indications.
432 An audible alarm may also be provided the signal of which should, if possible, be repeated periodically.
433 NOTE The system is ready to operate, if either the charger does charge the battery or the battery is fully charged and
434 there is no fault, which would prevent to feed the load from the battery.
435 It is preferable to separate the indication of a system fault, to two indications:System fault A: representing a
436 total system failure (immediate action is required) and a system fault B: with only partial or minor effect, such
437 as failure of luminaries.
438 6.7.3 Failure of the alarm indicator equipment shall not affect the operation of the power supply system.
439 6.7.4 The remote indication specified in 6.7.2 e) shall be ensured even in the event of a fault.
440 Compliance with the requirements of 6.7.1 to 6.7.4 is checked by inspection and measurement, for which the
441 battery charger is to be disconnected from the battery, and by simulation.
442 6.8 Fuses, protective devices and measuring instruments
443 6.8.1 Fuses shall comply with the relevant standard.
444 Double pole protective devices shall comply with EN 60947-2. Protective devices used in DC circuits shall be
445 rated for the required DC mode of operation.
446 6.8.2 If analogue measuring instruments are used, they shall comply with the following minimum
447 requirements:
448 – DC voltmeters shall comply with EN 60051, Class index 1,5;
449 – DC ammeters and ammeter shunts shall comply with EN 60051, Class index 1,5;
450 – AC voltmeters shall comply with EN 60051, Class index 2,5;
451 – AC ammeters and ammeter shunts shall comply with EN 60051, Class index 2,5; for central power
452 supply systems (CPS), the minimum scale length for measuring instruments shall be 50 mm; for low
453 power supply systems (LPS), the minimum scale length for measuring instruments shall be 20 mm.
454 Alternatively, if digital measuring instruments are used, their accuracy shall be equivalent to the accuracy of
455 analogue measuring instruments and should not exceed 2,5 %.
456 Compliance is checked by inspection.
457 6.9 Internal wiring
458 6.9.1 Internal wirings used for the AC supply and for safety circuits shall be separated from each other
459 either by means of separate compartments or by double insulation.
460 6.9.2 The internal wiring used for power circuits shall be of 300/500 V grade insulation in accordance
461 with EN 50525-2-31. Auxiliary circuits shall be designed in accordance with DIN VDE 0100-557
462 (VDE 0100-557).
463 Compliance is checked by inspection and measurement.

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464 6.10 Electric strength
465 At normal operating temperature, the equipment shall be able to withstand a test voltage between the
466 conductors of the main circuits and the protective conductor system.
467 Compliance is checked by following test:
468 Following battery recharge, the maintained circuit shall be operated at rated load for a minimum period of 1 h
469 after which the supply mains shall be disconnected. The equipment, with the battery disconnected, shall
470 withstand the electrical strength test at 2 U + 1 000 V for 1 min (where U is the nominal supply voltage). The
471 requirements are deemed to be complied with if no arc breakdown occurs.
472 Assemblies and devices not designed to withstand this test shall be disconnected prior to testing.
473 Assemblies and devices the electric strength of which is tested in accordance with the relevant product
474 standards are permitted to be disconnected during this test.
475 6.11 Recurring tests
476 6.11.1 The system (CPS and LPS) shall be manually tested at least once a week for proper functioning of
477 the transfer switching device and load current control and at least once a year for the rated autonomy.
478 NOTE This system also allows for some luminaires to be operated during maintenance or replacement of the battery.
479 6.11.2 For systems used to feed more than 50 luminaires, an automatic test system of Type ER as
480 specified in EN 62034, Annex B shall be incorporated in the central control unit type unless specified
481 otherwise by national standards. Operation of the luminaires shall also be monitored. For this, it is
482 permissible to monitor, in addition to the individual luminaires, the circuits of each of the final circuits
483 detecting failure of any individual luminaire by current changes provided that any missing information, such
484 as luminaire number of the faulty luminaire, can be added subsequently using a means provided for entering
485 other service related information or that an equivalent documentation is prepared.
486 NOTE Circuit monitoring can be relied upon only if the individual luminaires of the circuit concerned have similar
487 power values and characteristic.
488 Date and time of the rated autonomy time check should be chosen so, that the system safety is not affected
489 to an impermissible degree. If possible, endurance tests shall be carried out at times presenting a low risk.
490 Alternatively, suitable measures shall be taken for the time period until the batteries are recharged.
491 Suitable measures shall be taken so that the battery is recharged when use of the building is resumed so
492 that the safe use of the building is ensured by other means.
493 If the safe annual test is ensured by organizational means, then manual initiation is permitted.
494 6.11.3 The function of the battery shall be monitored at least once a year. For batteries being connected in
495 series or in parallel, the function and the voltage value of each battery block shall be tested and documented.
496 If an (additional) automatic, individual battery block monitoring (option) is used for the monitoring of the
497 battery, all requirements of EN 50272-2, about this, shall be considered. The recommendations from
498 IEC/TR 62060 (IEC/TC 21) should be considered.
499 If the LPS/CPS does supply emergency lighting applications, the monitoring system shall fulfil the following
500 requirements, in addition:
501 a) the cyclic monitoring (pref
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