EN ISO 2746:2015

SLOVENSKI STANDARD
01-januar-2016
1DGRPHãþD
SIST EN 14430:2004
Steklasti in porcelanski emajli - Visokonapetostni preskus (ISO 2746:2015)
Vitreous and porcelain enamels - High voltage test (ISO 2746:2015)
Emails und Emaillierungen - Hochspannungsprüfung (ISO 2746:2015)
Émaux vitrifiés - Essai sous haute tension (ISO 2746:2015)
Ta slovenski standard je istoveten z: EN ISO 2746:2015
ICS:
25.220.50 Emajlne prevleke Enamels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2746
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2015
EUROPÄISCHE NORM
ICS 25.220.50 Supersedes EN 14430:2004
English Version
Vitreous and porcelain enamels - High voltage test (ISO
2746:2015)
Emaux vitrifiés - Essai sous haute tension (ISO Emails und Emaillierungen - Hochspannungsprüfung
2746:2015) (ISO 2746:2015)
This European Standard was approved by CEN on 29 August 2015.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2746:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2746:2015) has been prepared by Technical Committee ISO/TC 107 " Metallic
and other inorganic coatings" in collaboration with Technical Committee CEN/TC 262 “Metallic and
other inorganic coatings” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2016, and conflicting national standards shall be
withdrawn at the latest by April 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 14430:2004.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 2746:2015 has been approved by CEN as EN ISO 2746:2015 without any modification.
INTERNATIONAL ISO
STANDARD 2746
Third edition
2015-10-01
Vitreous and porcelain enamels —
High voltage test
Émaux vitrifiés — Essai sous haute tension
Reference number
ISO 2746:2015(E)
©
ISO 2015
ISO 2746:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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copyright@iso.org
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ii © ISO 2015 – All rights reserved

ISO 2746:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Specimens . 2
7 Test voltage . 3
7.1 Test A: Detection of defects (3.1) which extend down to the metal basis (e.g. open pores) 3
7.2 Test B: Detection of defects and weak spots (3.2) . 4
8 Procedure. 4
9 Test report . 4
Bibliography . 6
ISO 2746:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
ISO 2746 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 262, Metallic and other inorganic coatings, in collaboration with Technical Committee
ISO/TC 107, Metallic and other inorganic coatings, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 2746:1998) which has been technically
revised. This edition has also been adopted as a European standard, which supersedes EN 14430:2004.
iv © ISO 2015 – All rights reserved

ISO 2746:2015(E)
Introduction
There are two different objectives for high voltage testing of vitreous and porcelain enamels.
Test A is used to detect and locate defects, which extend down to the metal base (e.g. open pores). This
is a non-destructive test usually applied to thin enamel coatings. The test serves to monitor either that
the parts produced are free from defects at the chosen test voltage, or to count the number of existing
defects, e.g. to determine the defect density (defects/m ) of enamelled architecture panels.
Test B is used to detect and locate defects, which extend down to the metal base (e.g. open pores) and
to detect weak spots. This is a destructive test, i.e. the test can generate open pores with an electric
discharge through weak spots in the enamel coating. This test is usually applied to thick enamel
coatings and serves:
a) to verify that an enamel coating is safe to be used under highly corrosive conditions, e.g. to test the
enamel coating of vessels used in the chemical industry, or
b) to verify that the enamel coating is safe to be used as a dielectric.
Test A and test B require the same test equipment (see Clause 5) and follow the same test procedure
(see Clause 8). However, for test B the applied voltage is higher than in test A (see Clause 7).
INTERNATIONAL STANDARD ISO 2746:2015(E)
Vitreous and porcelain enamels — High voltage test
WARNING — This International Standard may not be compliant with some countries’ health and
safety legislations and calls for the use of substances and/or procedures that may be injurious to
health if adequate safety measures are not taken. This International Standard does not address
any health hazards, safety or environmental matters and legislations associated with its use. It
is the responsibility of the user of this International Standard to establish appropriate health,
safety and environmentally acceptable practices and take suitable actions to comply with any
national and international regulations. Compliance with this International Standard does not of
itself confer immunity from legal obligations.
1 Scope
This International Standard describes two test methods of high voltage testing:
— Test A is used to detect and locate defects in vitreous and porcelain enamels;
— Test B is used to detect and locate defects and weak spots in vitreous and porcelain enamels.
The tests are performed using DC or pulsed DC high voltage.
The tests are applicable to dry surfaces of enamel coatings. In the case of moist surfaces, care should be
taken to ensure that the locating of any defects is correctly performed.
Since test voltages depend on the coating thickness, the test method, especially with test A, may not be
suitable for test specimens for which the coating thickness varies to a large extent.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness —
Magnetic method
ISO 2360, Non-conductive coatings on non-magnetic electrically conductive basis materials — Measurement
of coating thickness — Amplitude-sensitive eddy-current method
IEC/TS 60479-1, Effects of current on human beings and livestock — Part 1: General aspects
IEC/TS 60479-2, Effects of cur
...