1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 28 February 2005 prEN 3475-203 Edition P 3 February 2005 Comments should be sent within six months after the date of publication to AECMA-STAN ICs: 49.060 Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft
2、 use Test methods Part 203: Dimensions Supersedes edition P 2 November 1999 Srie arospatiale Luft- und Raumfahrt Cbles lectriques usage aronautique Mthodes dessais Partie 203 : Dimensions Elektrische Leitungen fr Luftfahrtverwendung P rfverfa h ren Teil 203: Mae This Xerospace Series“ Prestandard ha
3、s been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent
4、 to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN, it will be submitted
5、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 members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any na
6、tional standards conflicting with the EN. Electrical Domain I I Copyright 2005 O by AECMA-STA/ Page 2 prEN 3475-203:2005 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Electrical Domain. After inquiries and votes carried out in accordance with the rules of AEC
7、MA-STAN defined in AECMA- STANS General Process Manual, this standard has received approval for Publication. Contents Page 1 Scope 3 2 Normative referen ces 3 3 Apparatus 3 4 Method 3 5 Requirements 4 Page 3 prEN 3475-203:2005 1 Scope This standard specifies a method of measuring the dimensions of c
8、onductors and cables. 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 referenced docum
9、ent (including any amendments) applies. EN 3475-1 00, Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General. 3 Apparatus 3.1 Conductor diameter The measurement shall be made with a friction or dial micrometer with flat ends having a diameter of at least 5 mm. Use an
10、instrument constructed with a vernier capable of measurement to the nearest 0,Ol mm. 3.2 Insulation andlor jacket The measurements shall be carried out either with a profile projector, or measuring microscope or equivalent apparatus. 3.3 External diameter The measurement shall be made with a frictio
11、n or dial micrometer with flat ends having a diameter of at least 5 mm for single cables and at least 15 mm for multiconductor cables, or with a profile projector. 4 Method 4.1 Conductor The following shall be verified: - the number of strands making up the conductor; - the nominal diameter of the s
12、trands; - the diameter of the suitably straightened conductor. Measure the outside diameter (OD) of the specimen in at least three locations approximately one meter apart. Each measurement shall consist of two micrometer readings taken at 90“ from each other. (OD) = average diameter over the conduct
13、or Page 4 prEN 3475-203:2005 4.2 Insulation andlor jacket 4.2.1 Wrapped insulation andlor jacket Verify the following: - the number of tapes (if possible); - the sealing of the tapes; - the tape overlap; - the minimum thickness of the outer coating or layer or sealed material (if applicable). 4.2.2
14、Extruded insulation andlor jacket The radial thickness shall be measured at the thinnest and thickest points 4.2.3 Minimum average thickness Four measurements shall be made successively around the circumference of the specimen at 90“ intervals. The first measurement shall be made at the thinnest poi
15、nt of the cross-section. 4.3 External diameter 4.3.1 Single insulated wire or cable Measure the outside diameter (OD) of the specimen in at least three locations approximately one metre apart. Each measurement shall consist of two micrometer readings taken at 90“ from each other. 4.3.2 Non cylindric
16、al cables Measure the outside diameter (OD) of the specimen in at least six locations approximately equidistant along the length of the specimen. NOTE The location of each measurement shall be made at the maximal overall dimension (OD) = average diameter over the insulation or jacket 5 Requirements
17、5.1 Conductor The number of strands, the diameter of the strands and of the conductor shall comply with the values given in the product standard (if applicable). 5.2 Insulation andlor jacket 5.2.1 Wrapped insulation andlor jacket The characteristics shall conform to requirements given in the technic
18、al specification or the product standard (if applicable). Page 5 prEN 3475-203:2005 5.2.2 Extruded insulation andlor jackets The characteristics shall conform to requirements given in the technical specification or the product standard (if applicable). The minimum value of the radial thickness shall
19、 not be less than 70 % of the maximum measured value (the minimum to maximum thickness ratio). 5.2.3 Minimum thickness average The average of the four measurements shall be equal to or greater than the minimum value given in the product standard (if applicable). 5.3 External diameter The external diameter (average) shall conform to that stated in the product standard.
