1、February 2016 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.220.50!%LF_“2413560www.din.d
2、eDIN EN ISO 2746Vitreous and porcelain enamels High voltage test (ISO 2746:2015);English version EN ISO 2746:2015,English translation of DIN EN ISO 2746:2016-02Emails und Emaillierungen Hochspannungsprfung (ISO 2746:2015);Englische Fassung EN ISO 2746:2015,Englische bersetzung von DIN EN ISO 2746:20
3、16-02Emaux vitrifis Essai sous haute tension (ISO 2746:2015);Version anglaise EN ISO 2746:2015,Traduction anglaise de DIN EN ISO 2746:2016-02SupersedesDIN EN 14430:2004-12www.beuth.deDocument comprises 15 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be
4、 considered authoritative.02.16 DIN EN ISO 2746:2016-02 2 A comma is used as the decimal marker. National 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 “Metall
5、ic and other inorganic coatings” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-01-63 AA Prfung von Emails und Emaillierungen. The DIN Standards c
6、orresponding to the International Standards referred to in this document are as follows: ISO 2178 DIN EN ISO 2178 ISO 2360 DIN EN ISO 2360 IEC 60335-1 DIN EN 60335-1 (VDE 0700-1) IEC 60335-2-15 DIN EN 60335-2-15 (VDE 0700-15) IEC 60335-2-30 DIN EN 60335-2-30 (VDE 0700-30) IEC/TS 60479-1 DIN IEC/TS 6
7、0479-1 Amendments This standard differs from DIN EN 14430:2004-12 as follows: a) ISO 2746 has been harmonized with EN 14430; b) the maximum permitted test temperature has been increased to 45 C and the maximum recommended test temperature to 35 C; c) the document has been editorially revised; d) the
8、 Bibliography has been revised; Previous editions DIN 51163: 1967-01 DIN 51165: 1968-07 DIN ISO 2746: 1982-11, 1999-09 DIN EN 14430: 2004-12 DIN EN ISO 2746:2016-02 3 National Annex NA (informative) Bibliography DIN EN ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thi
9、ckness Magnetic method DIN EN ISO 2360, Non-conductive coatings on non-magnetic electrically conductive basis materials Measurement of coating thickness Amplitude-sensitive eddy current method DIN EN 60335-1 (VDE 0700-1), Household and similar electrical appliances Safety Part 1: General requirement
10、s DIN EN 60335-2-15 (VDE 0700-15), Household and similar electrical appliances Safety Part 2-15: Particular requirements for appliances for heating liquids DIN EN 60335-2-30 (VDE 0700-30), Household and similar electrical appliances Safety Part 2-30: Particular requirements for room heaters DIN IEC/
11、TS 60479-1, Effects of current on human beings and livestock Part 1: General aspects DIN EN ISO 2746:2016-02 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2746 October 2015 ICS 25.220.50 Supersedes EN 14430:2004English Version Vitreous and porcelain enam
12、els - High voltage test(ISO 2746:2015) Emaux vitrifis - Essai sous haute tension(ISO 2746:2015) Emails und Emaillierungen - Hochspannungsprfung (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 whic
13、h 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 Eur
14、opean 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 a
15、re 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, R
16、omania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and
17、by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2746:2015 EForeword 4Introduction 51 Scope . 62 Normative references 63 Terms and definitions . 64 Principle 75 Apparatus . 76 Specimens 77 Test voltage . 87.1 Test A: Detection of defects (3.1) which extend down to the metal
18、basis (e.g. open pores) 87.2 Test B: Detection of defects and weak spots (3.2) 98 Procedure. 99 Test report . 9Bibliography . 11Contents PageDIN EN ISO 2746:2016-02 EN ISO 2746:2015 (E) 2European foreword 3European foreword This document (EN ISO 2746:2015) has been prepared by Technical Committee IS
19、O/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
20、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 fo
21、r 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 Re
22、public, 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. En
23、dorsement notice The text of ISO 2746:2015 has been approved by CEN as EN ISO 2746:2015 without any modification. DIN EN ISO 2746:2016-02 EN ISO 2746:2015 (E) 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies)
24、. 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
25、-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 describ
26、ed 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 t
27、he 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
28、 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 w
29、ell as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationISO 2746 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 262, Metallic and other inorganic coa
30、tings, 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 r
31、evised. This edition has also been adopted as a European standard, which supersedes EN 14430:2004.DIN EN ISO 2746:2016-02 EN ISO 2746:2015 (E) 4 IntroductionThere are two different objectives for high voltage testing of vitreous and porcelain enamels.Test A is used to detect and locate defects, whic
32、h 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 def
33、ect density (defects/m2) 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 th
34、e 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, orb) to verify that the enamel coating is safe to be
35、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).DIN EN ISO 2746:2016-02 EN ISO 2746:2015 (E) 5 WARNING This International Standard
36、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 an
37、d 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 Inter
38、national Standard does not of itself confer immunity from legal obligations.1 ScopeThis 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
39、 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
40、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 referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for
41、 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 methodISO 2360, Non-conduc
42、tive coatings on non-magnetic electrically conductive basis materials Measurement of coating thickness Amplitude-sensitive eddy-current methodIEC/TS 60479-1, Effects of current on human beings and livestock Part 1: General aspectsIEC/TS 60479-2, Effects of current on human beings and livestock Part
43、2: Special aspects3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1defectarea of an enamel layer where an open path connects the enamel surface with the metal basisNote 1 to entry: Examples of defects are cracks or pores.DIN EN ISO 2746:2016-02 E
44、N ISO 2746:2015 (E) 6 3.2weak spotarea of an enamel layer where the dielectric strength falls below the required value, as determined by the application of high voltage because of blisters, foreign body inclusions, spalling or cracks4 PrincipleA high voltage electrode is passed over the enamel surfa
45、ce. Defects (Test A) or defects and weak spots (Test B) are indicated by a spark and a simultaneous optical and/or acoustic signal. The applied voltage can be DC or pulsed DC. The test voltage might be different in each case.At distances smaller than 2 cm of the edges/borders of the enamelled parts,
46、 an electrical arc can occur between the test electrode and edges/borders with no or only a limited enamel coating thickness. The high voltage technique may, therefore, not be applicable to such border areas.5 Apparatus5.1 High voltage generator.5.1.1 Direct-current (DC)-voltage generator, conformin
47、g to the requirements of IEC/TS 60479-1, able to deliver a DC-voltage corresponding to the testing voltage, adjustable and measurable at the test probe with limiting deviation +5 %/-10 %. The total internal resistance shall be high enough to give the short circuit current of the generator an arithme
48、tical mean from 2 mA to 3 mA maximum. The peak value of the current during a spark discharge shall be between 10 mA and 50 mA and the amount of charge per impulse shall be 25 C maximum.The negative pole of the generator shall be earthed (USA: grounded) and the positive pole shall be connected to the test electrode by a screened high voltage cable of suitable length.5.1.2 Pulsed DC-voltage generator, conforming to the requirements o
