Bsi bs en 03475 704 2007 (2008)

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Aerospace series —

Cables, electrical,

aircraft use — Test

methods —

Part 704: Flexibility

ICS 49.060

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BS EN 3475-704:2007

This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee

on 29 February 2008

© BSI 2008

ISBN 978 0 580 56705 6

National foreword

This British Standard is the UK implementation of EN 3475-704:2007 It supersedes BS EN 3475-704:2002 which is withdrawn

The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Panel ACE/6/-/2, Aerospace — Cables

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

Amendments/corrigenda issued since publication

Date Comments

EUROPÄISCHE NORM August 2007

English Version

Aerospace series - Cables, electrical, aircraft use - Test

methods - Part 704: Flexibility

Série aérospatiale - Câbles électriques à usage

aéronautique - Méthodes d'essais - Partie 704 : Flexibilité Luft- und Raumfahrt - Elektrischen Leitungen für LuftfahrtVerwendung - Prüfverfahren - Teil 704: Biegsamkeit

This European Standard was approved by CEN on 21 June 2007.

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 on 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 Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä IS C H E S K O M IT E E FÜ R N O R M U N G

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2007 CEN All rights of exploitation in any form and by any means reserved

2

Foreword 3

1 Scope 4

2 Normative references 4

3 Test Procedures 4

EN 3475-704:2007

3

Foreword

This document (EN 3475-704:2007) 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 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 February 2008, and conflicting national standards shall be withdrawn

at the latest by February 2008

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 This document supersedes EN 3475-704:2002

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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom

4

1 Scope

This standard specifies two methods for appraising the flexibility of a completed cable and its bending aptitude, Method 1 is for cables not less than 5 mm2 cross-section cables and Method 2 for cables not larger than 5 mm2 (10 AWG) cross-section cables

Unless otherwise specified in the product standard, Method 1 applies

It shall be used together with EN 3475-100

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 document (including any amendments) applies

EN 3475-100, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 100: General

3.1 Method 1 (applicable for cable sizes larger than 5 mm2 (10 AWG))

3.1.1 Preparation of specimens

Sufficiently long test specimen shall be sampled from a completed cable and, after appropriate forming, shall undergo a compression crushing test performed with an appropriate machine

For each test specimen, forming shall consist in making a loop of a diameter equal to 40 times the maximum diameter of the cable The loop shall be made in the normal cable winding direction The two ends shall be stripped over 5 mm and placed together, then soldered with tin or spliced

Key

1 Dm = maximum diameter of the cable

2 Solder or splice

Necessary length: π× 40 × Dm = 125,7 × Dm

Figure 1 — Test specimen forming

EN 3475-704:2007

5

3.1.2 Apparatus

The set-up shall comply with the specifications stipulated below and shall consist of a device designed crush the loop, preferably in the vertical direction, over a height 10 times the maximum diameter of the cable (25 %

of the loop diameter) at a 100 mm/min speed

This device shall be fitted with a recording system

Key

1 Retaining notch

2 Position of loop connection

Figure 2 — Test mounting 3.1.3 Procedure

This test shall be performed at ambient temperature

A test specimen shall be put in the crushing device with the loop junction point in contact with the support

Then, the test specimen shall be subjected to a gradual force F

3.1.4 Requirements

The force F applied to crush the loop 25 % shall be less than the value specified in the product standard

6

3.2 Method 2 (applicable for cable sizes not larger than 5 mm2 (10 AWG))

3.2.1 Preparation of specimens

Cut the cable specimens, each approximately 200 mm long, consecutively from the same coil

The specimens shall be straightened by hand

or

when specified in the individual cable specification, hang each specimen vertically for 24 hours in an oven with the mass specified in Table 1 attached to its free end The oven temperature is be as stated in the individual cable specification but shall not exceed the cables maximum rated temperature

After straightening the specimen test shall be performed within 1 hour at an ambient temperature (20 °C ± 5 °C)

3.2.2 Apparatus

The apparatus shall consist of a device, shown in Figure 3, designed to examine the bending attitude

Key

1 Clamp

2 Mandrel

3 Specimen

4 Recoil

5 Mass container

Figure 1 — Method 2, test apparatus

5

1

3 2

4

Dimensions in millimetres

EN 3475-704:2007

7

3.2.3 Procedure

Test the specimens using the rig shown in Figure 3, the diameter of the mandrel in the test rig being that specified in Table 1 Gradually apply a mass to the cable at the position shown in Figure 1 sufficient to bend the cable downwards through (90 10

− )° Ensure that the specimen remains in this position for 5 min and record the mass After this time, remove the mass and allow the specimen to recoil towards its original position At a time 5 min after removal of the mass, record the recoil distance

Table 1

001 26 15 5

002 24 15 7

004 22 15 10

006 20 15 15

010 18 25 20

012 16 25 25

020 14 25 30

030 12 25 40

050 10 50 50

3.2.4 Requirements

The mass required to bend the cable through (90 10

− )° and the recoil angle shall not exceed the values stated

in the individual cable specification

BS EN

3475-704:2007

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