1、Cables, electrical, aircraft use Test methods Part 305: Overload resistance The European Standard EN 3475-305:2002 has the status of a British Standard ICs 49.060 BS EN 3475-30512002 Wk present to the responsible European committee any enquiries on the interpretation, or proposals for change, and ke
2、ep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement international or E
3、uropean publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the n
4、ecessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page,
5、 pages 2 and 3 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 15 February 2002 ISBN O 580 38368 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3475-305 February 2002 ICs 49.060 English version Aerospace series - Cables,
6、electrical, aircraft use - Test methods - Part 305: Overload resistance Srie arospatiale - Cbles lectriques usage aronautique - Mthodes dessais - Partie 305: Tenue aux surcharges Luft- und Raumfahrt - Elektrische Leitungen fr Luftfahrt, Verwendung - Prfverfahren - Teil 305: Uberlastbarkeit This Euro
7、pean Standard was approved by CEN on 5 August 2001 CEN members are bound to comply with the CENKENELEC 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 conce
8、rning such national standards may be obtained on application to the 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 la
9、nguage and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, S
10、weden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Me
11、mbers. Ref. No. EN 34753052002 E EN 3475-305:2002 (E) Foreword This document (EN 3475-305:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the app
12、roval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standards, either by publication of an identical text or by endorsement, at the latest by August 2002, and c
13、onflicting national standards shall be withdrawn at the latest by August 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France,
14、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 3475-305:2002 (E) 1 Scope This standard specifies a method of measuring the resistance to overload of finished cables. It shall be used together with EN
15、 3475-100. 2 Normative references 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
16、 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. EN 3475-100 Aerospace series - Cables, electrical, aircraft use - Test methods - Part 10
17、0: General 3 Preparation of specimens Each specimen having 0,75 m to 1 m useful length between the supports, shall be installed horizontally in front of a screen and lightly stretched at the ends to avoid any slack during the test. The test shall be carried out at ambient temperature in a chamber wh
18、ere the whole unit shall be sheltered from draughts. An extraction shall be provided but only operated after completion of the test. To identify the appearance of smoke, a screen with black and white horizontal bands or any other device shall be used. 4 Method The purpose of this test shall be to ch
19、eck that there is no smoke emission for an overload level bringing the conductor to a temperature TI, and that for an overload bringing the conductor to a temperature T2, there is neither ignition nor disappearance of the insulation. The temperatures TI and T2 shall be specified in the product stand
20、ard. The test shall be performed on size 0,60 mm2 only. The temperatures shall be determined by measuring the variation of the voltage drop in the central part of the cable (2/3 of the useful length maximum) between the voltage application points. EL= R, = I + 0,004 (e- 20) A u20 R20 First regulate
21、the current to a value Il, which raises the temperature of the conductor to TI, for a period of 30 min (temperature defined in the product standard). The current shall then be increased to a second value I2 for 15 min, bringing the temperature of the conductor to T2 (temperature defined in the produ
22、ct standard). 5 Req ui rements At TI : At TZ : no visible deterioration of the insulation (peeling, cracking, stripping of the conductor) no no visible smoke or smell or appreciable change of colour; spontaneous combustion and no visible smoke. 3 BS EN 3475-30512002 BSI 389 Chiswick High Road Lon do
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