Aerospace series - Cables, electrical, aircraft use - Test methods - Part 418: Thermal endurance for conductors

This European Standard specifies a test method to value the thermal endurance of bi-metal conductors, by valuation of the influence of metallic migration on the electrical resistance per unit length.
It shall be used together with EN 3475-100.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 418: Thermische Gebrauchsdauer für Leiter

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d’essais - Partie 418 : Endurance thermique des conducteurs

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 418. del: Toplotna vzdržljivost za vodnike

Ta evropski standard določa preskusno metodo za vrednotenje toplotne vzdržljivosti dvokovinskih vodnikov
z vrednotenjem vpliva kovinske migracije na električni upor pri dolžini enote.
Uporabljati ga je treba skupaj s standardom EN 3475-100.

General Information

Status
Published
Publication Date
18-Jun-2019
Withdrawal Date
30-Dec-2019
ICS
49.060 - Aerospace electric equipment and systems
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 2 - Electrical
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-Jan-2025
Completion Date
21-Jan-2026
Ref Project
SIST EN 3475-418:2019 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 418: Thermal endurance for conductors

Relations

Replaces
EN 3475-418:2007 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 418: Thermal endurance for conductors
Effective Date
26-Jun-2019

Overview

EN 3475-418:2019 is a European Standard developed by CEN that specifies a test method to evaluate the thermal endurance of bi-metal conductors used in aerospace electrical cables. This standard focuses on assessing how metallic migration affects the electrical resistance per unit length of conductors when exposed to elevated temperatures over time. The standard is designed for use alongside EN 3475-100, which covers general test methods for aerospace electrical cables.

This test method is critical for ensuring the reliability and safety of electrical wiring systems in aircraft, where conductor performance under thermal stress directly impacts electrical integrity and mechanical properties. EN 3475-418:2019 provides aerospace manufacturers and testing laboratories with a clear and standardized approach to determine conductor durability under thermal conditions typical of aerospace environments.

Key Topics

  • Thermal Endurance of Bi-metal Conductors
    The standard applies to conductors such as tin-coated copper, copper clad steel, and copper clad aluminium. It evaluates thermal endurance by monitoring the growth of inter-metallic compounds formed due to diffusion mechanisms at elevated temperatures.

  • Influence of Metallic Migration
    Thermal exposure can cause metallic migration at conductor layer interfaces, leading to changes in electrical resistance-an important indicator of conductor degradation. Measuring this resistance increase helps gauge the conductor’s thermal endurance.

  • Test Procedure and Conditions
    Specimens from the same cable batch undergo thermal ageing in an air-circulating oven at specified temperatures and durations. Periodic resistance measurements are performed following established methods in EN 3475-301 to track resistance changes.

  • Acceptance Criteria
    The standard defines two conditions to assess compliance:

    1. Resistance increase must be below the maximum specified in the relevant product standard.
    2. If the first condition is not met, resistance increases must be within specified percentage limits of the initial measurement and the product standard’s maximum allowable resistance.

  • Temperature-Time Equivalence
    The standard describes the theoretical basis to relate exposure time at different temperatures using diffusion coefficients, allowing accelerated testing while ensuring realistic simulation of long-term thermal ageing.

Applications

  • Aerospace Electrical Wiring Systems
    EN 3475-418 is crucial for verifying the long-term reliability of electrical cables in aircraft, particularly those with bi-metal conductors. It ensures that cables can withstand the thermal stresses encountered during typical operational and environmental conditions.

  • Quality Assurance & Certification
    Manufacturers use this standard to validate conductor constructions and cable batches before release. Testing to EN 3475-418 supports compliance with aerospace certification requirements and promotes safety and performance consistency.

  • Research and Development
    Design teams and material scientists utilize the thermal endurance test data to optimize conductor materials and coatings, improving resistance to diffusion-related degradation and enhancing cable lifespan.

  • Maintenance and Lifecycle Assessment
    Periodic retesting informed by EN 3475-418 guidelines can assist in determining the end-of-life criteria for cable systems and inform maintenance schedules to prevent electrical failures caused by conductor degradation.

Related Standards

  • EN 3475-100: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General
    Provides the general testing framework and principles applicable to aerospace electrical cables and must be used in conjunction with EN 3475-418.

  • EN 3475-301: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 301: Ohmic resistance per unit length
    Specifies the method for measuring the electrical resistance used as a key parameter in evaluating thermal endurance per EN 3475-418.

  • Additional Aerospace Wiring Standards
    The EN 3475 series includes multiple parts addressing cable mechanical, environmental, and electrical tests, ensuring comprehensive assessment and standardization of aerospace wiring products.

Keywords: aerospace standards, thermal endurance test, bi-metal conductors, electrical resistance, metallic migration, aircraft cables, EN 3475-418:2019, aerospace electrical wiring, cable testing methods, thermal ageing, CEN standard, conductor reliability.

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Frequently Asked Questions

EN 3475-418:2019 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Cables, electrical, aircraft use - Test methods - Part 418: Thermal endurance for conductors". This standard covers: This European Standard specifies a test method to value the thermal endurance of bi-metal conductors, by valuation of the influence of metallic migration on the electrical resistance per unit length. It shall be used together with EN 3475-100.

This European Standard specifies a test method to value the thermal endurance of bi-metal conductors, by valuation of the influence of metallic migration on the electrical resistance per unit length. It shall be used together with EN 3475-100.

EN 3475-418:2019 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 3475-418:2019 has the following relationships with other standards: It is inter standard links to EN 3475-418:2007. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 3475-418:2019 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN 3475-418:2009
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
418. del: Toplotna vzdržljivost za vodnike
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 418: Thermal
endurance for conductors
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren -
Teil 418: Thermische Gebrauchsdauer für Leiter
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais -
Partie 418 : Endurance thermique des conducteurs
Ta slovenski standard je istoveten z: EN 3475-418:2019
ICS:
29.060.20 Kabli Cables
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3475-418
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2019
EUROPÄISCHE NORM
ICS 49.060
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 418: Thermal endurance for conductors
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essais - Partie 418 : Luftfahrtverwendung - Prüfverfahren - Teil 418:
Endurance thermique des conducteurs Thermische Gebrauchsdauer für Leiter
This European Standard was approved by CEN on 6 January 2019.

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-CENELEC 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-CENELEC Management
Centre 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3475-418:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Introduction . 4
5 Preparation of specimens . 5
6 Apparatus. 6
7 Method . 6
8 Requirements . 6
Annex A (normative) Standard evolution form . 7

European foreword
This document (EN 3475-418:2019) 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 December 2019, and conflicting national standards shall
be withdrawn at the latest by December 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 3475-418:2007.
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, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies a test method to value the thermal endurance of bi-metal conductors,
by valuation of the influence of metallic migration on the electrical resistance per unit length.
It shall be used together with EN 3475-
...

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