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EUROPEAN STANDARD
EN 50405

NORME EUROPÉENNE
August 2006
EUROPÄISCHE NORM

ICS 29.280


English version


Railway applications -
Current collection systems -
Pantographs, testing methods for carbon contact strips



Applications ferroviaires -  Bahnanwendungen -
Systèmes de captage de courant - Stromabnahmesysteme -
Méthodes d'essais des bandes de Stromabnehmer für
frottement en carbone des pantographes Oberleitungsfahrzeuge, Prüfverfahren
für Kohleschleifstücke




This European Standard was approved by CENELEC on 2006-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

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

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

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

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50405:2006 E

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EN 50405:2006 - 2 -
Foreword
This European Standard was prepared by SC 9XB, Electromechanical material on board of rolling stock, of
Technical Committee CENELEC TC 9X, Electrical and electronic applications for railways. The text of the
draft was submitted to the formal vote and was approved by CENELEC as EN 50405 on 2006-03-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-03-01
__________

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- 3 - EN 50405:2006
Content
Page
1 Scope.4
2 Normative references .4
3 Definitions .4
4 Symbols and abbreviations.5
5 Tests .5
5.1 General.5
5.1.1 Type tests.5
5.1.2 Routine tests .5
5.2 Test procedures .5
5.2.1 Tests for the temperature characteristic of the carbon contact strip under rated current loading .5
5.2.2 Test for deflection and extension of the carbon contact strip under extremes of temperature.7
5.2.3 Test for flexural characteristic of the carbon contact strip.8
5.2.4 Test for shear strength of the contact strip.9
5.2.5 Test of autodrop detection sensor integral with contact strips.12
5.2.6 Test of mechanical fatigue resistance of the carbon contact strip .14
5.2.7 Test of the electrical resistance of the contact strip .13
Annex A (normative) List of tests.15
Annex B (informative) Parameters to be specified by the customer.16

Figure 1 – Arrangement of test device for testing temperature characteristic .6
Figure 2 – Example of current supply connection .7
Figure 3 – High temperature test.8
Figure 4 – Preparation of samples .9
Figure 5 – Example of suitable fixture for testing shear strength
of carbon contact strip .9
Figure 6 – Example of testing configuration of shear strength test.10
Figure 7 – Typical impact test device .12
Figure 8 – Air supply and monitoring equipment.13
Figure 9 – Test of electrical transfer resistance from the carbon contact surface
to the supporting structure.14
Figure 10 – Connection scheme for test of electrical resistance.14

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EN 50405:2006 - 4 -
1 Scope
This European Standard gives rules for testing methods for carbon contact strips. The purpose of this
standard is to demonstrate that the carbon strip construction is fit for purpose. Not all tests may be
relevant to some designs.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN ISO 9001 Quality management systems – Requirements (ISO 9001)
EN 50206-1 Railway applications – Rolling stock – Pantographs: Characteristics and
tests – Part 1: Pantographs for main line vehicles
EN 50206-2 Railway applications – Rolling stock – Pantographs: Characteristics and
tests – Part 2 : Pantographs for metros and light rail vehicles
EN 50367 Railway applications – Current collection systems – Technical criteria for
the interaction between pantograph and overhead line (to achieve free
access)
IEC 60413 Test procedures for determining physical properties of brush materials
for electrical machines
3 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
carbon contact strip
strip of carbon material, permanently attached to an integral supporting structure (carrier) but excluding
bolted assemblies
3.2
shear strength
stress at failure of the adhesion between carbon and the support structure
3.3
autodrop detection (ADD) sensor
mechanism incorporated in the carbon contact strip to provide the indication for the pantograph automatic
dropping device
3.4
flow continuity
uninterrupted flow of air or other fluid
3.5
rated current loading
current value defined by the manufacturer that the carbon strip is designed to sustain without degradation
under the specified operating conditions

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- 5 - EN 50405:2006
4 Symbols and abbreviations
2
A designed area of adhesion (mm )
F shear force (N)
S
R resistance (Ω)
2
Τ shear strength (N/mm )
s
5 Tests
5.1 General
There are two categories of tests:
– type tests,
– routine tests.
The above tests are described in 5.1.1 to 5.1.2.
Supplementary tests may be required if they have been specified in the customer specification and after
agreement with the supplier.
Annex A summarises the tests which shall be performed.
5.1.1 Type tests
Type tests shall be performed on a single piece of product of a given design.
Equipment in current manufacture shall be considered to have satisfied the type tests; if the manufacturer
can provide certified reports of type tests already conducted on identical components, the type tests shall
be considered to be complied with.
5.1.2 Routine tests
Routine tests shall be carried out to verify that the properties of a product correspond to those measured
during the type test. Routine tests shall be performed by the supplier on each equipment.
5.2 Test procedures
5.2.1 Tests for the temperature characteristic of the carbon contact strip under rated current
loading
5.2.1.1 General
The test aims to determine the temperature characteristic to stability of the carbon contact strip at the
maximum designed current loading.

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EN 50405:2006 - 6 -
5.2.1.2 Test method
The carbon contact strip shall be fixed at one end and freely supported at the other end (see Figure 1).
The current supply connection shall be made by clamping suitable interfaces to the vertical faces of the
carbon, but not in contact with the carrier material (see Figure 2). The current take off shall be made at
the normal design interface(s).

Key
1 parallel clamp (steel)
2 carbon contact strip fixed end
3 temperature sensor 2 mm above carbon carrier interface
4 power supply
Figure 1 – Arrangement of test device for testing temperature characteristic

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- 7 - EN 50405:2006

Key
1 current supply connection (steel, copper)
Figure 2 – Example of current supply connection

The temperature shall be monitored adjacent to the current supply connection at a point 2 mm above the
carbon / carrier interface. The maximum rated current loading shall be applied to the carbon contact strip
until the monitored temperature remains constant and then for a further 30 minutes. The temperature
shall be continuously recorded during the test as a temperature – time characteristic.
Test acceptance criteria: The carbon contact strip shall remain fit for purpose. The contact strip shall
remain in accordance with drawing at room temperature.
5.2.2 Test for deflection and extension of the carbon contact strip under extremes of
temperature
5.2.2.1 General
The test aims to determine the vertical displacement and change in length of the carbon contact strip
under extremes of temperature.
5.2.2.2 Test method
5.2.2.2.1 High temperature test
This test may be carried out concurrently with the test described in 5.2.1. Under the steady state heated
conditions of 5.2.1.2, the change of length of the carrier (Δl) and vertical displacement of the strip (Δh)
from the room temperature condition shall be recorded (see Figure 3).

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EN 50405:20
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