EN 3475-404:2025

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 404 : Thermal shock

This document specifies a method of evaluating the performance of a cable after exposure to a thermal shock.
It is intended to be used together with EN 3475-100.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 404: Thermischer Schock

Dieses Dokument legt ein Verfahren zur Beurteilung des Verhaltens einer Leitung nach einer thermischen Schockbeanspruchung fest.
Es ist zur Verwendung in Verbindung mit EN 3475 100 vorgesehen.

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essai - Partie 404 : Choc thermique

Le présent document spécifie une méthode pour évaluer la performance d'un câble après exposition à un choc thermique.
Il est destiné à être utilisé conjointement avec l’EN 3475-100.

Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode - 404. del: Toplotni šok

Ta dokument določa metodo za vrednotenje delovanja kabla po izpostavljenosti toplotnemu šoku. Dokument je treba uporabljati v povezavi s standardom EN 3475-100.

General Information

• Status: Published
• Publication Date: 15-Jul-2025
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2/S 2 - Cables & Stripping Tools
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 16-Jul-2025
• Completion Date: 16-Jul-2025
• Ref Project: SIST EN 3475-404:2025 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 404 : Thermal shock

Relations

• Replaces: EN 3475-404:2002 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 404: Thermal shock
• Effective Date: 06-Dec-2023

Overview

EN 3475-404:2025 is a European standard established by CEN for aerospace electrical cables focusing on thermal shock testing. This part 404 specifies a precise test method to evaluate the performance and durability of electrical cables and insulated conductors used in aircraft subjected to rapid and extreme temperature changes. Designed to be applied in conjunction with EN 3475-100, it ensures that cable materials withstand thermal shocks without degradation that could compromise safety or functionality. The standard was updated from its 2002 version to reflect advancements in testing protocols and improve reliability assessments in aerospace applications.

Key Topics

• Scope and Purpose

  • Specifies a method to assess cable performance after exposure to thermal shock.
  • Applies to insulated conductors and jacketed cables used in aircraft electrical systems.

• Specimen Preparation

  • Specimens are 1.5 meters long, taken from finished cables.
  • Ends are stripped carefully to expose conductor or core, ensuring consistent test conditions.

• Test Apparatus

  • Requires a coil support with a minimum diameter of 0.3 meters to hold the cable in a spiral form.
  • An oven capable of reaching and maintaining specified test temperatures is used.

• Thermal Shock Test Procedure

  • The specimen cycles through heating in an oven for 30 minutes at a predetermined temperature.
  • Immediately cooled to -55 ± 2 °C for 30 minutes to simulate extreme cold exposure.
  • Returned to ambient temperature for at least 30 minutes.
  • The cycle is repeated four times total to simulate repeated thermal stress.

• Post-Test Requirements

  • Measure insulation thickness and jacket integrity at both ends of the specimen.
  • Any variation beyond product standard limits or material flaring is considered a failure.

• Compliance and Updates

  • Supersedes EN 3475-404:2002 with enhanced precision in specimen preparation and measurement protocols.
  • Enforced as a harmonized European standard, facilitating uniform testing across CEN member countries.

Applications

EN 3475-404:2025 is essential for aerospace manufacturers, cable suppliers, and testing laboratories involved in the design, quality assurance, and certification of aircraft electrical wiring systems. Practical applications include:

• Assessment of Cable Reliability
  Ensures cables maintain physical and electrical integrity after undergoing thermal shock during flight cycles or rapid environmental temperature changes.

• Quality Control in Cable Production
  Cable manufacturers use this method to verify that their products meet strict aerospace thermal shock performance criteria before delivery.

• Maintenance and Safety Verification
  Aerospace operators and maintenance engineers utilize this standard to evaluate aged or suspect cables for potential enduring damage due to thermal stress.

• Research and Development
  Engineers employ the test in developing new cable materials and constructions tailored to extreme temperature resilience in aircraft environments.

Related Standards

• EN 3475-100 – General Test Methods
  Fundamental procedures and terminology for aerospace cable testing used alongside Part 404 to provide a comprehensive evaluation framework.

• EN 3475 Series
  A complete aerospace cable series covering mechanical, electrical, and environmental tests ensuring cables conform to industry-wide performance requirements.

• ISO and IEC Electropedia
  Provides authoritative terminology and definitions relevant to electrical cables and testing for international standardization consistency.

Keywords

Aerospace cables, thermal shock testing, aircraft electrical wiring, EN 3475-404:2025, cable performance evaluation, insulated conductors, cable jacket, aerospace standards, thermal cycling test, electrical cable durability, aerospace cable testing methods, CEN standards, aircraft cable certification, electrical cable quality assurance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Aeronavtika - Električni kabli za uporabo v zračnih plovilih - Preskusne metode -
404. del: Toplotni šok
Aerospace series - Cables, electrical, aircraft use - Test methods - Part 404 : Thermal
shock
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren, Teil
404: Thermischer Schock
Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essai - Partie
404 : Chocs thermiques
Ta slovenski standard je istoveten z: EN 3475-404:2025
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 3475-404
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 49.060 Supersedes EN 3475-404:2002
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 404 : Thermal shock
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essai - Partie 404 : Choc Luftfahrtverwendung - Prüfverfahren - Teil 404:
thermique Thermischer Schock
This European Standard was approved by CEN on 23 June 2025.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3475-404:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Preparation of a specimen . 4
4.1 Insulated conductor . 4
4.2 Cable jacket . 4
5 Apparatus . 4
6 Method (applicable for insulated conductors and jacketed cables) . 4
7 Requirements . 5
Bibliography .
...