SIST-TP CLC/TR 50718:2025
(Main)Guidelines for the use of EN 45545-2 for Ni-Cd batteries on board rolling stock
Guidelines for the use of EN 45545-2 for Ni-Cd batteries on board rolling stock
This document guides users of the EN 45545 series, particularly EN 45545 2:2020+A1:2023, in the application of these standards in designing and assessing Ni-Cd batteries on board trains for their fire protection measures.
This document excludes any new requirements, considering only the requirements stated by the above listed standards.
However, since the EN 45545 series contain generic requirements and do not specifically refer to Ni-Cd batteries, this document helps the application for those batteries.
Leitfaden für die Verwendung von EN 45545-2 für Nickel-Cadmium-Batterien auf Bahnfahrzeugen
Lignes directrices pour l'utilisation de l'EN 45545-2 pour les batteries Ni-Cd à bord du matériel roulant
Smernice za uporabo standarda EN 45545-2 za nikelj-kadmijeve baterije na železniških vozilih
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Nadomešča:
SIST-TP CLC/TR 50718:2021
Smernice za uporabo standarda EN 45545-2 za nikelj-kadmijeve baterije na
železniških vozilih
Guidelines for the use of EN 45545-2 for Ni-Cd batteries on board rolling stock
Leitfaden für die Verwendung von EN 45545-2 für Nickel-Cadmium-Batterien auf
Bahnfahrzeugen
Lignes directrices pour l'utilisation de l'EN 45545-2 pour les batteries Ni-Cd à bord du
matériel roulant
Ta slovenski standard je istoveten z: CLC/TR 50718:2025
ICS:
13.220.20 Požarna zaščita Fire protection
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL REPORT CLC/TR 50718
RAPPORT TECHNIQUE
TECHNISCHER REPORT June 2025
ICS 45.060.01; 13.220.20 Supersedes CLC/TR 50718:2021
English Version
Guidelines for the use of EN 45545-2 for Ni-Cd batteries on
board rolling stock
Lignes directrices pour l'utilisation de l'EN 45545-2 pour les Leitfaden für die Verwendung von EN 45545-2 für Nickel-
batteries Ni-Cd à bord du matériel roulant Cadmium-Batterien auf Bahnfahrzeugen
This Technical Report was approved by CENELEC on 2025-06-02.
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,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TR 50718:2025 E
Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Main aspects and requirements of EN 45545-2 addressed by this guide . 5
4.1 General . 5
4.2 Need of clarification and suggested methodological approach . 5
4.2.1 General . 5
4.2.2 Need of clarification . 5
4.2.3 Specific approach . 6
5 Guiding the assessment of the Ni-Cd batteries . 6
6 Examples of possible assessments of the Ni-Cd battery applied on the Ni-Cd cell . 6
7 Spare parts management . 8
Bibliography . 10
European foreword
This document (CLC/TR 50718:2025) has been prepared by CLC/TC 9X “Electrical and electronic applications
for railways”.
This document supersedes CLC/TR 50718:2021.
— Examples were added for clarification in Clause 6.
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.
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.
Introduction
The design, verification and testing of Ni-Cd batteries on board rolling stock is standardized by EN 50547:2013,
which refers to the EN 45545 series and particularly to EN 45545-2:2020+A1:2023 in the clause “Fire behaviour
requirements”.
However, the referred series deals with the Ni-Cd batteries in a generic and limited way:
— EN 45545-2:2020+A1:2023 deals with Ni-Cd batteries as non-listed products.
As a consequence, the application of the EN 45545 series to the case of Ni-Cd batteries on board of trains
opens the door to very different interpretations.
Designers, assessors, producers and customers have very different points of view which could result in
problematic aspects which are difficult to be fixed and agreed upon.
In order to overcome such situations, TC9X decided to set up the Survey Group CLC TC9X WG31 with the task
to prepare a new standard; the SG31 proposes in the meantime to issue guidelines for the application of the
EN 45545 series in case of Ni-Cd batteries on board rolling stock.
This document has been prepared according to decision 58/12 taken during the TC 9X plenary meeting and the
following approved NWIP, see BT decision D166/C095 in document BT166/DG11706/DL.
This document is a report of the available experience and best practice in applying the EN 45545 series to the
case of Ni-Cd batteries on board rolling stock.
1 Scope
This document guides users of the EN 45545 series, particularly EN 45545-2:2020+A1:2023, in the application
of these standards in designing and assessing Ni-Cd batteries on board trains for their fire protection measures.
This document excludes any new requirements, considering only the requirements stated by the above listed
standards.
However, since the EN 45545 series contain generic requirements and do not specifically refer to Ni-Cd
batteries, this document helps the application for those batteries.
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 45545-1:2013, Railway applications - Fire protection on railway vehicles - Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 45545-1:2013 apply.
ISO and IEC maintain terminology 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
4 Main aspects and requirements of EN 45545-2 addressed by this guide
4.1 General
This clause reports the list of aspects and requirements which are stated by EN 45545-2:2020+A1:2023 and
which need clarification and guiding in case of application to Ni-Cd cells and batteries.
4.2 Need of clarification and suggested methodological approach
4.2.1 General
The use of EN 45545-2:2020+A1:2023 for such areas as vehicle interiors is generally considered clear; Ni-Cd
batteries were not considered a problem, and therefore were not specifically addressed.
There is a consensus between CEN and CENELEC experts that the application of the current
EN 45545-2:2020+A1:2023 standard applied specifically to Ni-Cd batteries has resulted in an observed risk of
battery fire departure initiated by the battery itself, e.g. loss of electrical insulation.
4.2.2 Need of clarification
In EN 45545-1:2013, listed product and non-listed product are defined respectively in 3.33 and 3.41 referring to
EN 45545-2:2020+A1:2023, Table 2. This table does not mention Ni-Cd battery, so Ni-Cd battery is a non-listed
product.
NOTE 1 A good definition of listed products could be: ”A product which is listed in Table 2 of EN 45545-2:2020+A1:2023,
4.4.”.
NOTE 2 A good definition of unlisted products could be: “A product whi
...
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