SIST EN 61811-51:2003
(Main)Electromechanical all-or-nothing relays -- Part 51: Blank detail specification - Electromechanical all-or-nothing telecom relays of assessed quality - Non-standardized types and construction
Electromechanical all-or-nothing relays -- Part 51: Blank detail specification - Electromechanical all-or-nothing telecom relays of assessed quality - Non-standardized types and construction
Is a blank detail specification applicable to electromechanical all-or-nothing telecom relays of assessed quality. Selects the appropriate methods of test to be used in detail specifications and contains basic test schedules to be used in the preparation of such specifications.
Elektromechanische Schaltrelais -- Teil 51: Vordruck für Bauartspezifikation - Elektromechanische Telekom-Relais mit bewerteter Qualität - Nicht standardisierte Bauarten und Konstruktionen
Relais électromécaniques de tout-ou-rien -- Partie 51: Spécification particulière cadre - Relais électromécaniques de tout-ou-rien télécom soumis au régime d'assurance de la qualité - Types et construction non normalisés
Cette publication existe en langue anglaise uniquement.
Electromechanical all-or-nothing relays - Part 51: Blank detail specification - Electromechanical all-or-nothing telecom relays of assessed quality - Non-standardized types and construction
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Standards Content (Sample)
SLOVENSKI SIST EN 61811-51:2003
STANDARD
april 2003
Electromechanical all-or-nothing relays - Part 51: Blank detail specification -
Electromechanical all-or-nothing telecom relays of assessed quality - Non-
standardized types and construction
ICS 29.120.70 Referenčna številka
SIST EN 61811-51:2003(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD EN 61811-51
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2002
ICS 29.120.70 Supersedes EN 116501:1992
English version
Electromechanical all-or-nothing relays
Part 51: Blank detail specification -
Electromechanical all-or-nothing telecom relays of assessed quality -
Non-standardized types and construction
(IEC 61811-51:2002)
Relais électromécaniques de tout-ou-rien Elektromechanische Schaltrelais
Partie 51: Spécification particulière cadre - Teil 51: Vordruck für Bauartspezifikation -
Relais électromécaniques de tout-ou-rien Elektromechanische Telekom-Relais
télécom soumis au régime mit bewerteter Qualität -
d'assurance de la qualité - Nicht standardisierte Bauarten
Types et construction non normalisés und Konstruktionen
(CEI 61811-51:2002) (IEC 61811-51:2002)
This European Standard was approved by CENELEC on 2002-05-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61811-51:2002 E
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EN 61811-51:2002 - 2 -
Foreword
The text of document 94/145/FDIS, future edition 2 of IEC 61811-51, prepared by IEC TC 94,
All-or-nothing electrical relays, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61811-51 on 2002-05-01.
This European Standard supersedes EN 116501:1992.
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) 2003-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-05-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61811-51:2002 was approved by CENELEC as a European
Standard without any modification.
__________
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- 3 - EN 61811-51:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60068-1 1988 Environmental testing
+ corr. October 1988 Part 1: General and guidance
+ A1 1992 EN 60068-1 1994
IEC 60068-2-17 1994 Part 2: Tests - Test Q: Sealing EN 60068-2-17 1994
IEC 60068-2-20 1979 Part 2: Tests - Test T: Soldering
+ A2 1987 HD 323.2.20 S3 1988
IEC 60068-2-47 1999 Part 2-47: Test methods - Mounting of EN 60068-2-47 1999
components, equipment and other + corr. June 2000
articles for vibration, impact and similar
dynamic tests
IEC 60255-14 1981 Electrical relays --
Part 14: Endurance test for electrical
relay contacts - Preferred values of
contact loads
IEC 60695-2-2 1991 Fire hazard testing EN 60695-2-2 1994
Part 2: Test methods -
Section 2: Needle-flame test
IEC 61709 1996 Electronic components - Reliability - EN 61709 1998
Reference conditions for failure rates
and stress models for conversion
IEC 61810-7 1997 Electromechanical all-or-nothing relays--
Part 7: Test and measurement
procedures
IEC 61811-1 1999 Electromechanical non-specified time EN 61811-1 1999
all-or-nothing relays of assessed quality
Part 1: Generic specification
IEC 61811-50 2002 Part 50: Sectional specification - EN 61811-50 2002
Electromechanical all-or-nothing
telecom relays of assessed quality
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EN 61811-51:2002 - 4 -
Publication Year Title EN/HD Year
IEC QC 001002-2 1998 Rules of Procedure of the IEC Quality--
Assessment System for Electronic
Components (IECQ)
Part 2: Documentation
IEC QC 001002-3 1998 Part 3: Approval procedures - -
IEC QC 001005 2000 Register of firms, products and services--
approved under the IECQ system,
including ISO 9000
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INTERNATIONAL IEC
STANDARD
61811-51
QC 160501
Second edition
2002-03
Electromechanical all-or-nothing relays –
Part 51:
Blank detail specification –
Electromechanical all-or-nothing telecom
relays of assessed quality –
Non-standardized types and construction
Relais électromécaniques de tout-ou-rien –
Partie 51:
Spécification particulière cadre –
Relais électromécaniques de tout-ou-rien télécom
soumis au régime d'assurance de la qualité –
Types et construction non normalisés
IEC 2002 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
T
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue
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– 2 – 61811-51 IEC:2002(E)
CONTENTS
FOREWORD.3
1 General .5
1.1 Scope.5
1.2 Normative references .5
1.3 Front page of the detail specification.6
2 Characteristic values of the relay .7
2.1 General data.7
2.2 Construction of IECQ type designation (ordering information).8
2.3 Coil data.8
2.4 Contact data.9
2.4.1 Electrical endurance and switching frequency.9
2.4.2 Static contact-circuit resistance.9
2.4.3 Mechanical endurance .9
2.4.4 Timing (without suppression device).9
2.5 Mounting .9
2.6 Environmental data.10
2.7 Package of relays for automatic handling (if applicable) .10
3 Qualification approval procedures .10
4 Quality conformance inspection .10
4.1 Formation of inspection lots .11
4.2 Intervals between tests .11
5 Marking and documentation .11
5.1 Marking of the relay .11
5.2 Marking of the package.11
5.3 Documentation .11
6 Annexes .11
7 Tests .12
7.1 Standard conditions for testing.12
7.2 Mounting of test specimens during the test .12
7.3 General conditions for testing .12
8 Ordering information .12
9 Relay reliability – failure rate data (optional) .12
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61811-51 © IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –
Part 51: Blank detail specification –
Electromechanical all-or-nothing telecom relays of assessed quality –
Non-standardized types and construction
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61811-51 has been prepared by IEC technical committee 94:
All-or-nothing electrical relays.
This second edition of IEC 61811-51 cancels and replaces the first edition published in 1997
and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
94/145/FDIS 94/159/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The QC number that appears on the front cover of this publication is the specification number
in the IEC Quality Assessment System for Electronic Components (IECQ).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
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– 4 – 61811-51 IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until 2007.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
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61811-51 © IEC:2002(E) – 5 –
ELECTROMECHANICAL ALL-OR-NOTHING RELAYS –
Part 51: Blank detail specification –
Electromechanical all-or-nothing telecom relays of assessed quality –
Non-standardized types and construction
1 General
1.1 Scope
This part of IEC 61811 is a blank detail specification applicable to electromechanical all-or-
nothing telecom relays of assessed quality. Relays according to this standard are provided for
operation in telecommunication applications. However, as electromechanical all-or-nothing
relays, they are also suitable for particular industrial and other applications.
This standard selects from IEC 61810-7 and other sources the appropriate methods of test
to be used in detail specifications derived from this specification, and contains basic test
schedules to be used in the preparation of such specifications in accordance with IEC 61811-1.
1.2 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.
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60068-2-17:1994, Environmental testing – Part 2: Tests – Test Q: Sealing
IEC 60068-2-20:1979, Environmental testing – Part 2: Tests – Test T: Soldering
Amendment 2 (1987)
IEC 60068-2-47:1999, Environmental testing – Part 2-47: Test methods – Mounting of
components, equipment and other articles for vibration, impact and similar dynamic tests
IEC 60255-14:1981, Electrical relays – Part 14: Endurance test for electrical relay contacts –
Preferred values for contact loads
IEC 60695-2-2:1991, Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame test
IEC 61709:1996, Electronic components – Reliability – Reference conditions for failure rates
and stress models for conversion
IEC 61810-7:1997, Electromechanical all-or-nothing relays – Part 7: Test and measurement
procedures
IEC 61811-1:1999, Electromechanical non-specified time all-or-nothing relays of assessed
quality – Part 1: Generic specification
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– 6 – 61811-51 IEC:2002(E)
IEC 61811-50:2002, Electromechanical all-or-nothing relays – Part 50: Sectional specification –
Electromechanical all-or-nothing telecom relays of assessed quality
QC 001002-2:1998, Rules of Procedure for the IEC Quality Assessment System for Electronic
Components (IECQ) – Part 2: Documentation
QC 001002-3:1998, Rules of Procedure for the IEC Quality Assessment System for Electronic
Components (IECQ) – Part 3: Approval Procedures
QC 001005:2000, Register of Firms, Products and Services approved under the IECQ System,
including ISO 9000
(National authorized institutions will complete this clause by making reference to any
documents or specifications directly referred to in their national equivalent of this standard.)
1.3 Front page of the detail specification
The layout of the front page of the detail specification is as follows.
(1) QC xxxxxx (2)
Edition: 200X
Page 1 of x
Electronic components of assessed (3) (4)
quality in accordance with:
IEC 61810-7:1997
IEC 61811-50:2002
Detail specification for electromechanical all-or-nothing telecom relays of assessed quality
Type: (5)
Construction: (6)
Outline drawing and wiring diagram (7) Application: (8)
Dimensions in millimetres
Coil data (9)
Rated voltages: … V d.c.
Rated power: … mW
Contact data (10)
Number(s) and type(s) of contacts
Rated contact voltage:
Rated contact current:
Rated contact power:
Component climatic category according to IEC 60068-1: (11)
Temperature range – operating ambient temperature: …°C to …°C
– storage temperature: …°C to …°C
Information about manufacturers who have components qualified according to this detail
specification is available in the current QC 001005.
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61811-51 © IEC:2002(E) – 7 –
Key to front page:
The numbers between brackets on the front page correspond to the following indications which
should be given.
Identification of the detail specification
(1) The name of the national standards organization under whose authority the detail specifi-
cation is published and, if applicable, the organization from whom the detail specification
is available.
(2) The IECQ symbol and the number allotted to the completed detail specification by the
IECQ secretariat.
(3) The number and the year of availability of the IEC standard concerning test and
measurement procedures for electromechanical all-or-nothing relays and/or sectional
specification; also national reference, if different.
(4) If different from the IECQ number, the national number of the detail specification, date of
issue and any further information required by the national system, together with any
amendment numbers.
Identification of the relay
(5) Type: monostable or bistable, non-polarized or polarized, number and types of contacts.
(6) Construction: sizes, for example dual-in-line, base and overall height, type of relay,
based upon environmental protection (RT I to RT IV), mounting variants and other typical
construction details.
(7) An outline drawing with main dimensions which are of importance for interchangeability,
and/or reference to the appropriate national or international document for outlines.
Alternatively, this drawing may be given in an annex to the detail specification, but (7)
should always contain an illustration of the general outer appearance of the component.
(8) Typical field of applications.
(9) Available rated coil voltages and rated power.
(10) Available contact arrangements, defined special contact materials and contact voltage,
current and power. The respective code digit for contact materials shall be listed in an
annex, if applicable.
(11) Component climatic category according to clause 8 and annex A of IEC 60068-1, and
temperature range.
2 Characteristic values of the relay
2.1 General data
– Thermal resistance: max. … K/W
– Contact application: CA 0, CA 1, CA 2 and CA 3
– Relay mass: max. … g
– Finish of the terminals: presoldering; admissible non-presoldered part, for example max.
distance to the relay body, if applicable
– Insulation resistance: … MΩ min. at 500 V d.c. initial value
– Dielectric strength: see table 1
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– 8 – 61811-51 IEC:2002(E)
Table 1 – Dielectric test voltages
Dielectric test Impulse voltage test
V a.c. min.
10/700 μs and/or 1,2/50μs
V min.
Opened contact circuits
Between separate contact circuits
Coil to contact circuits
All parts to case
2.2 Construction of IECQ type designation (ordering information)
Relay IECQ xxxxxx
X Y 9 Z
Denomination
IECQ detail specification number
Rated coil voltage (first letter of identification code of table 2)
Rated power (second letter of identification code of table 2)
Defined, special contact material (according to annex)
Special attributes and/or surface mounting type (according to annex)
The coding of the monostable or bistable relay type shall be combined with the rated power of
the coil, if applicable. The reference to the number and types of contacts shall be given on the
front page of the specification.
Use code 0 as the last digit if no special attributes apply. If one of the attributes in the example
for a detail specification shall not be considered, the corresponding code number or letter shall
be deleted; there shall be no special marks or open space for non-applicable attributes (see
also 2.5).
The manufacturer may use his own numbering system, provided that a conversion list with the
IECQ type designations and the manufacturer's part numbers is given in an annex to the detail
specification.
2.3 Coil data
Table 2 – Coil data
Maximum
Coil Must operate Must not Must release
coil
Identifi- Rated resistance voltage release voltage voltage Rated
voltage
cation voltage at V V V power
V
V (23 ± 2) °C mW
code at coil at coil at coil
at coil
Ω ± 10 % temperature of temperature of temperature of
temperature of
°C 23 °C °C °C 23 °C °C 23 °C °C
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61811-51 © IEC:2002(E) – 9 –
2.4 Contact data
2.4.1 Electrical endurance and switching frequency
Contact failure: contact-circuit resistance of a closed contact higher than the value stated
in 2.4.2, or resistance of an open contact-circuit lower than 100 kΩ, both more than once per
6 6
10 cycles or for the minimum number of switching cycles stated (if lower than 10 ), calculated
for each single contact.
7
Example: at a given endurance of 10 operations, the total number of faults, as described
above, shall not exceed 10.
Table 3 – Loads, contact-circuit resistance limits, switching cycles and frequencies
for electrical endurance and overload tests
Contact-circuit Number of Switching
Loads resistance switching frequencies
ΩΩΩΩ max. cycles min. cycles per s max.
Contact application 0
Resistive max. contact voltage/max. power
Resistive max. contact current/max. power
DC open-ended cable
Overload
2.4.2 Static contact-circuit resistance
100 mΩ max. initial condition at rated voltage;
10 mΩ max. difference of contact-circuit resistance at other coil voltages (e.g. at must
operate voltage for make contacts), initial value;
1 Ω max. during/after electrical endurance and environmental tests at rated voltage.
2.4.3 Mechanical endurance
Min. … switching cycles.
2.4.4 Timing (without suppression device)
– Operate time: max. …ms
– Release time: max. …ms
– Bounce time when the contacts are closing: max. …ms
– Bounce time when the contacts are opening: max. …ms
– Transfer time on operation and release (last break contact opens
before first make contact closes respectively last make contact
opens before first break contact closes – each contact monitored) or
bridging time on operation and release (last make contact closes
before first break contact opens respectively last break contact
closes before first make contact opens – each contact monitored): min. …ms
2.5 Mounting
The relay terminals are designed to be directly soldered onto the printed circuit board using
conventional assembling techniques or for surface mounting technology (if applicable).
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– 10 – 61811-51 IEC:2002(E)
2.6 Environmental data
The relays shall withstand at least the following environmental stresses:
2
– shock, functional: …m/s (g) half-sine acceleration, …ms duration;
2
– shock, survival: …m/s (g) half-sine acceleration, …ms duration;
2
– vibration (sinusoidal): …amplitude mm or …m/s (g), to …Hz;
– mechanical robustness of terminals
• thrust: …N;
• bending: …bends;
– soldering:
• if particular ageing is required, this shall be selected from procedures 1a, 1b, 2 or 3 of
4.2 of IEC 60068-2-20 and stated in the detail specification;
• solderability at 235 °C: 2 s;
• resistance to soldering heat,
terminal immersion time at 260 °C: 5 s or 10 s;
3
– enclosure (if relevant): leak rate: max. 100 Pa · cm /s;
– resistance to cleaning solvents when rubbed with tissue paper: demineralized or distilled
water at 55 °C: 5 min;
– fire hazard, needle flame: min. …s;
– acoustic noise level (optional requirement
shall be stated in detail specification): max. …dB.
2.7 Package of relays for automatic handling (if applicable)
If stick magazines or tape and reel packaging for automatic handling (to facilitate automatic
relay insertion) are used, their outline drawing (profile and length), storage capacity and
possible marking shall be given in an annex.
3 Qualification approval procedures
– As stated in 3.1.4 a) of QC 001002-3, fixed sample.
– Sampling and test schedule are specified in table 5.
– The tests specified and their order are mandatory.
4 Quality conformance inspection
Quality conformance inspection contains the tests stated in table 4:
– groups A and B: lot-by-lot tests;
– group C: periodic tests.
Unless otherwise stated in this blank detail specification, all tests of table 4 are mandatory.
Where a subgroup contains cumulative tests, the order of the tests is mandatory. Specimens
subjected to tests denoted as destructive (D) shall not be released for delivery.
NOTE If a special level of AQL is required, the AQL value regarding subgroups A4, B1 and B2 in table 4 should be
provided between the manufacturer and user of a relay.
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61811-51 © IEC:2002(E) – 11 –
4.1 Formation of inspection lots
According to 3.2.3 of QC 001002-3, the basis for determination of sample size for the quality
conformance inspection is the relay quantity produced during one week.
4.2 Intervals between tests
– Subgroups A4, B1 and B2: minimum once a week.
– Subgroups C1 and C2: at least once a year.
– Subgroups C4 to C6: at least once every two years.
5 Marking and documentation
Relays and their package shall be marked as follows.
5.1 Marking of the relay
The marking shall be durable and easily legible, the following items shall be present:
a) manufacturer's name, logo or trade mark;
b) relay type and variant code;
c) coded date of manufacture, in terms of year/week according to 1.5.3 of IEC 61811-50;
d) IECQ in letters or IECQ mark of conformity;
e) IECQ type designation (ordering information), if not implicit in b), see also 2.2;
f) identification of terminal No. 1.
NOTE IECQ type designation in item e) may be omitted in an unavoidable case.
5.2 Marking of the package
a) Manufacturer's name, logo or trade mark.
b) Relay type and variant code.
c) Manufacture’s batch identification code.
d) IECQ in letters or IECQ mark of conformity;
e) IECQ type designation(ordering information), if not implicit in b), see also 2.2;
f) Detail specification reference if not marked on the relay.
g) Quantity.
NOTE IECQ type designation in item e) may be omitted in an unavoidable case.
5.3 Documentation
For each delivery, a declaration of conformity according to 2.4 of QC 001002-2 shall be added.
6 Annexes
Annexes may be added if necessary, for example to show more details on relay mounting,
terminal dimensions, etc.
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– 12 – 61811-51 IEC:2002(E)
7 Tests
7.1 Standard conditions for testing
If not otherwise stated, all tests shall be performed under standard conditions for testing
according to 3.5 of IEC 61810-7.
7.2 Mounting of test specimens during the test
The following indications shall apply for mechanical dynamic tests (shock and vibration). The
relay shall be mounted by its normal mounting method to the test fixture where inherent
resonances have been minimized so as not to invalidate the test (see also IEC 60068-2-47).
7.3 General conditions for testing
Unless otherwise stated, the rated coil voltage specified in table 2 and its suitable polarity
(if applicable) shall be used for all tests and its application to the relay.
8 Ordering information
See 2.2.
9 Relay reliability – failure rate data (optional)
The evaluation and indication of reliability data is not mandatory.
However, if required in a detail
...
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