1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3838:2010Aerospace series Requirements and tests onuser-applied markings onaircraft electrical cablesBS EN 3838:2010 BRITISH STANDARDNational forewordThis British Standard
2、is the UK implementation of EN 3838:2010.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does no
3、t purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 70744 5ICS 49.040; 49.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of
4、 theStandards Policy and Strategy Committee on 31 July 2010Amendments issued since publicationDate Text affectedBS EN 3838:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3838 July 2010 ICS 49.040 English Version Aerospace series - Requirements and tests on user-applied markings on aircraft
5、 electrical cables Srie arospatiale - Exigences et mthodes dessais sur les marquages utilisateurs de cbles lectriques aronautiques Luft- und Raumfahrt - Anforderungen und Prfungen der Anwenderkennzeichnung auf elektrischen Luftfahrzeugleitungen This European Standard was approved by CEN on 5 May 201
6、0. 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 o
7、n application to the CEN 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 Management C
8、entre 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, N
9、orway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any fo
10、rm and by any means reserved worldwide for CEN national Members. Ref. No. EN 3838:2010: EBS EN 3838:2010EN 3838:2010 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Qualification tests 64.1 Tests 64.2 Test sequence 65 Acceptance tests .76 Tes
11、t methods 86.1 Visual examination of markings .86.2 Permanence of markings 86.3 Resistance to fluids .96.4 Heat ageing .96.5 Exposure to light. 106.6 Marking contrast . 106.7 Bending at ambient temperature. 116.8 Voltage test 11BS EN 3838:2010EN 3838:2010 (E) 3 Foreword This document (EN 3838:2010)
12、has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the
13、member countries of ASD, prior to its presentation to CEN. 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 January 2011, and conflicting national standards shall be withdrawn at the latest by Janu
14、ary 2011. 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. According to the CEN/CENELEC Internal Regulations, the national standards or
15、ganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
16、Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3838:2010EN 3838:2010 (E) 4 Introduction Durability of function-related marking of aircraft electrical cables is of great importance throughout the life of an aircraft, during initial assembly, operation
17、and maintenance operations in service. Markings should, therefore, be made to a sufficiently high standard to satisfy requirements initially and for the remainder of the expected life marked cable or equipment containing it. Markings are applied by the user to the cable insulation, jacket or sheath
18、and should not degrade the performance of the cable. They should be applied in accordance with design requirements using a process approved by the Design Authority. BS EN 3838:2010EN 3838:2010 (E) 5 1 Scope This standard specifies tests that should be performed on markings applied by the user to ens
19、ure that their durability is satisfactory and that, after application of markings directly to the cable insulation, jacket or sheath, the cable will meet the performance requirements laid down. 2 Normative references The following referenced documents are indispensable for the application of this do
20、cument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General EN 3475-201, Aerospace series Cables,
21、electrical, aircraft use Test methods Part 201: Visual examination EN 3475-302:2006, Aerospace series Cables, electrical, aircraft use Test methods Part 302: Voltage proof test EN 3475-401:2002, Aerospace series Cables, electrical, aircraft use Test methods Part 401: Accelerated ageing EN 3475-405:2
22、002, Aerospace series Cables, electrical, aircraft use Test methods Part 405: Bending at ambient temperature EN 3475-411, Aerospace series Cables, electrical, aircraft use Test methods Part 411: Resistance to fluids EN 3475-703:2002, Aerospace series Cables, electrical, aircraft use Test methods Par
23、t 703: Permanence of manufacturers marking EN 3475-705, Aerospace series Cables, electrical, aircraft use Test methods Part 705: Contrast measurement EN ISO 4892-3:2006, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps (ISO 4892-3:2006) 3 Terms and definitions Fo
24、r the purposes of this document, the following terms and definitions apply. For other definitions see EN 3475-100. 3.1 marking identification mark applied directly to the cable insulation, jacket or sheath by any process that meets the requirements of this standard NOTE The markings should be in acc
25、ordance with the design requirements. 3.2 aggressive marking system marking which can deform or damage the insulating layer of a cable BS EN 3838:2010EN 3838:2010 (E) 6 NOTE Hot-stamp is defined as such a method. Other methods of marking may be defined as aggressive by the Official Services. 4 Quali
26、fication tests 4.1 Tests The tests in Table 1 shall be performed at the introduction of the marking process, at every change in technology or processing technique affecting the cable insulation, jacket or sheath or as required by the Official Services. Tests shall be performed on the sizes for quali
27、fication defined in the cable specification for each colour, material and construction of cable, jacket and sheath which will be directly marked. Before the tests defined in Table 1 are performed on specimens of user marked cable, ensure that the specimens have been subjected to any post marking cur
28、ing which is normal for the defined marking process. Table 1 Title Subclause Visual examination of markings 6.1 Permanence of markings 6.2 Resistance to fluids 6.3 Heat ageing 6.4 Exposure to light 6.5 Marking contrast 6.6 Bending at ambient temperature 6.7 4.2 Test sequence The number of specimens
29、for each test and the sequence of testing shall be as laid down in Table 2. Each specimen shall be taken sequentially from a continuous length of cable. BS EN 3838:2010EN 3838:2010 (E) 7 Table 2 GroupNumber of specimens TestsTitle Subclause 1 5 Visual examination of markings 6.1 Marking contrast 6.6
30、 Permanence of markings 6.2 2 1 per fluid Visual examination of markings 6.1 Resistance to fluids 6.3 Marking contrast 6.6 3 3 Visual examination of markings 6.1 Heat ageing 6.4 Marking contrast 6.6 4 3 Visual examination of markings 6.1 Exposure to light 6.5 Visual examination of markings 6.1 5 a 3
31、 Visual examination of markings 6.1 Bending at ambient temperature 6.7 aGroup 5 tests only performed on markings made by aggressive marking systems. 5 Acceptance tests The tests in Table 3 shall be performed on each production batch of markings. Visual examination shall be made on specimens taken ea
32、ch time production is started (e.g. at start of day or shift), at the beginning and end of each production run and at intervals not exceeding 10 000 m for single core cables and 800 m for multicore and screened cables. Table 3 Title Subclause Applicable Visual examination of markings 6.1 All marking
33、 systems Voltage test 6.8 6.8.4.1 or 6.8.4.2 continuously Tests on aggressive marking systems BS EN 3838:2010EN 3838:2010 (E) 8 6 Test methods 6.1 Visual examination of markings 6.1.1 Object The markings shall be examined to ensure that they are legible and comply with the specified requirements in
34、respect of size and style of print and colour if specified. 6.1.2 Apparatus A light source which provides an illumination of 500 lx min. on a flat work surface. 6.1.3 Test specimen The test specimen shall be a length of marked cable. The specimen shall not be tested until all drying, cooling or curi
35、ng has been completed in accordance with the process specification. 6.1.4 Procedure The test specimen shall be placed flat on the work surface and shall be visually examined from a distance of 0,3 m without additional magnification other than spectacles if worn. For initial examination only, a magni
36、fication of between six times and ten times shall be used to inspect for any mechanical damage to the insulation or conductors (EN 3475-201). 6.1.5 Requirements The legend of the marking shall be uniform and clearly legible. Each individual character shall be easily identified. In any case of disagr
37、eement concerning compliance with these conditions, the marking contrast test in 6.6 shall be performed. 6.2 Permanence of markings 6.2.1 Object The marking shall be tested to ensure that it will withstand the specified scrape abrasion and retain legibility. 6.2.2 Apparatus See EN 3475-703:2002, Cla
38、use 4. 6.2.3 Test specimen See 6.1.3. 6.2.4 Procedure See EN 3475-703, except that the load shall be 1 N and the number of cycles shall be 50 for ink jet marking and 100 for all other types of marking. BS EN 3838:2010EN 3838:2010 (E) 9 6.2.5 Requirements The printing shall remain legible as in 6.1 a
39、nd comply with Clause 5 of EN 3475-703:2002 except that one of the five specimens may not be completely legible if this is due to a local defect of the cable top coat. 6.3 Resistance to fluids 6.3.1 Object The marking shall be tested to ensure that it remains legible after immersion in the test flui
40、ds specified in EN 3475-411. 6.3.2 Apparatus Suitable containers for immersing specimens and maintaining specified test temperature for duration of immersion. 6.3.3 Specimen See 6.1.3. 6.3.4 Procedure One specimen shall be immersed in each test fluid specified in EN 3475-411 for the time and tempera
41、ture stated. At the conclusion of immersion the specimens shall be removed from the fluids and after draining for 1 h at ambient temperature shall be dried by dabbing (not wiping) with a lint-free cloth and shall be visually examined. 6.3.5 Requirements See 6.1. Any deviation shall be reported. 6.4
42、Heat ageing 6.4.1 Object The marking shall be tested to ensure that it remains legible when heat aged at the temperature specified in the cable product standard. 6.4.2 Apparatus See EN 3475-401:2002, Clause 4. 6.4.3 Specimen See 6.1.3 and Clause 3 of EN 3475-401:2002. 6.4.4 Procedure Specimen shall
43、be placed in an oven for 168 h at the cable operating temperature as specified in the product standard for the cable. See EN 3475-401. BS EN 3838:2010EN 3838:2010 (E) 10 6.4.5 Requirements The specimen shall meet the requirements of 5.4 of EN 3475-401:2002 and the marking shall remain legible as in
44、6.1. 6.5 Exposure to light 6.5.1 Object The marking shall be tested to ensure that it remains legible after exposure to laboratory light sources. 6.5.2 Apparatus See EN ISO 4892-3:2006, lamp type 1. 6.5.3 Specimen See 6.1.3. 6.5.4 Procedure See EN ISO 4892-3. The specimen shall be mounted so that th
45、e marks being tested face the light source and unless other wise specified in the product standard exposure mode 1 used. 6.5.5 Requirements Unless otherwise specified in the concerned product standard, after exposure for 168 h the contrast, as measured in 6.6, shall be not less than 40 %. 6.6 Markin
46、g contrast 6.6.1 Object The marking shall be examined to ensure that there is sufficient contrast between it and the surface on which it is made for its legibility to be acceptable in all light conditions. 6.6.2 Apparatus See EN 3475-705. 6.6.3 Test specimen See 6.1.3. 6.6.4 Procedure See EN 3475-70
47、5. 6.6.5 Requirements Unless otherwise specified in the concerned product standard, the contrast shall be not less than: 50 % initially; 40 % after application of specified tests. BS EN 3838:2010EN 3838:2010 (E) 11 6.7 Bending at ambient temperature 6.7.1 Object The object of this test is to ensure
48、that the application of the marking has not caused mechanical damage to the insulation. 6.7.2 Apparatus See EN 3475-405:2002, Clause 4. 6.7.3 Test specimen See 6.1.3 and EN 3475-405:2002, Clause 3. 6.7.4 Procedure See EN 3475-405:2002, 5.1. 6.7.5 Requirements See EN 3475-405:2002, 5.2. 6.8 Voltage t
49、est 6.8.1 Object The specimen shall be tested to ensure that the application of the marking has not degraded the electrical performance of the insulation, sheath or jacket. 6.8.2 Apparatus See EN 3475-302:2006, Clauses 3, 4 and 5. 6.8.3 Test specimen See 6.1.3 and EN 3475-302. 6.8.4 Procedure 6.8.4.1 Dry test as EN 3475-302:2006, Clause 4. 6.8.4.2 Dry test (impulse) as EN 3475-302:2006, Clause 5. 6.8.5 Requirements There shall be no perforation of th
