1、ASD STANDARD NORME ASD ASD NORM prEN 3475-506 Edition P 2 September 2006 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Supersedes issue P 1 of Augus
2、t 1992 and will supersede EN 3475-506:2002 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 506: Plating continuity Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 506 : Continuit du revtement Luft- und Raumfahrt Elektrische
3、Leitungen fr Luftfahrtverwendung Prfverfahren Teil 506: Gleichmaigkeit des berzugs This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European
4、Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without r
5、e-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national membe
6、rs have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 30 September 2006 Comments should be sent within six months after the date of publication to ASD-S
7、TAN Electrical Domain Copyright 2006 by ASD-STAN prEN 3475-506:20062 Contents Page Foreword2 1 Scope 3 2 Normative references 3 3 Preparation of specimens.3 3.1 General3 3.2 Strands before stranding or screening .3 3.2.1 Copper strands 3 3.2.2 Copper-clad aluminum strands3 3.3 Strands after strandin
8、g or screening.4 3.3.1 General4 3.3.2 Copper conductors or copper screens .4 3.3.3 Copper-clad aluminum conductors .4 4 Method 4 5 Requirements.4 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordanc
9、e with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3475-506:20063 1 Scope This standard specifies a method of verifying the continuity of plating on strands which are: either checked before stranding or screening, or ch
10、ecked after stranding or screening It shall be used together with EN 3475-100. 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 ref
11、erenced document (including any amendments) applies. EN 3475-100, Aerospace series Cables, electrical, aircraft use Test methods Part 100: General. ASTM B 33-81, Standard specification for tinned soft or annealed copper wire for electrical purposes. 1)ASTM B 298-99, Standard specification for silver
12、-coated soft or annealed copper wire. 1)ASTM B 355-95, Standard specification for nickel-coated soft or annealed copper wire. 1)3 Preparation of specimens 3.1 General The ASTM B 33 or ASTM B 298 or ASTM B 355 plating continuity test method applies to single end wires taken before stranding or before
13、 screening. Thus the applicability of the polysulfide test is restricted by the ASTM in recognition of the abrasion to the wire inherent in the stranding or in the screening process. 3.2 Strands before stranding or screening 3.2.1 Copper strands Prepare three strands at least 150 mm long as specimen
14、s and carefully straighten them by hand. Degrease the strands without damaging them and wipe them with a clean dry cloth. After cleaning, the strands shall not be touched with bare fingers. The length of the specimen which is immersed shall be at least 110 mm. 3.2.2 Copper-clad aluminum strands Prep
15、are three strands at least 150 mm long as specimens. 1) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, USA. prEN 3475-506:20064 Degrease the strands without damaging them and wipe them with a clean dry cloth. Aft
16、er cleaning, the strands shall not be touched with bare fingers. By using gloves, wind five turns of each strand on a mandrel which diameter is about 12 times the strand diameter. NOTE Due to hardness differences between, aluminium, copper and coating (particularly nickel) materials and possible ass
17、ociated drawbacks during strand drawings after plating, turns are necessary to reveal possible weakness. 3.3 Strands after stranding or screening 3.3.1 General Due to the above restriction by the ASTM in recognition of the abrasion to the wire inherent in the stranding or in the screening process, t
18、he following preparation of specimens apply when testing stranded or screened product: 1) Unilay or Concentric constructions to be tested as the whole conductor 2) Two members from each layer of rope constructions to be tested after they have been carefully removed from the finished rope 3) Screen t
19、o be tested as whole conductor after it has been carefully separated from cable jacket and from inner core(s) 3.3.2 Copper conductors or copper screens Prepare three samples at least 150 mm long as specimens. Degrease the specimens without damaging them and wipe them with a clean dry cloth. After cl
20、eaning, the specimens shall not be touched with bare fingers. The length of the specimen which is immersed shall be at least 110 mm. 3.3.3 Copper-clad aluminum conductors Prepare three samples at least 150 mm long as specimens. Degrease the specimens without damaging them and wipe them with a clean
21、dry cloth. After cleaning, the specimens shall not be touched with bare fingers. By using gloves, wind five turns of each conductor on a mandrel which diameter is about 12 times the conductor diameter. 4 Method Place the specimens for 30 s in a sodium polysulphide solution which has a density of 1,1
22、42 g/cm3at 20 C, then wash them carefully in distilled water. In addition, for silver plating, the samples shall then be immersed for 15 s in a solution of hydrochloric acid which has a density of 1,088 g/cm3at 20 C. The specimens shall then be washed carefully again in distilled water. 5 Requirements Examination shall occur immediately after the solution cycle. There shall be no adherent or distinctly visible black spots when examined with the naked eye. Any blackening occurring less than 15 mm from each end shall be disregarded.
