EN 3475-408:2005

Aerospace series - Cables, electrical, aircraft use - Test methods - Part 408: Fire resistance

This standard specifies a method of testing the fire resistance of "fire-proof" electrical cables.

Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren - Teil 408: Feuerbeständigkeit

Diese Norm legt ein Verfahren zur Prüfung von feuerbeständigen elektrischen Leitungen fest.

Série aérospatiale - Câbles électriques à usage aéronautique - Méthodes d'essais - Partie 408 : Résistance au feu

Aeronavtika – Električni kabli za uporabo v zračnih plovilih – Preskusne metode – 408. del: Požarna odpornost

General Information

• Status: Published
• Publication Date: 15-Nov-2005
• Withdrawal Date: 30-May-2006
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2 - Electrical
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 16-Nov-2005
• Completion Date: 16-Nov-2005
• Ref Project: SIST EN 3475-408:2006 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 408: Fire resistance

Relations

• Revised: EN 3475-408:2025 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 408: Fire resistance
• Effective Date: 28-Jan-2023

Overview

EN 3475-408:2005 - Aerospace series: Cables, electrical, aircraft use - Test methods - Part 408: Fire resistance - specifies a reproducible method to evaluate the fire resistance of fire-proof electrical cables for aircraft. Prepared under AECMA and adopted by CEN (approved September 2005), the standard defines specimen preparation, test apparatus, test procedures and pass/fail electrical requirements to verify continuity and insulation during combined flame and vibration exposure.

Key topics and technical requirements

• Specimens
  • Six test specimens selected at random; minimum length 0.75 m.
  • Centre section immersion: 0.5 m length for 24 h in one of the test fluids.
• Test fluids (per EN 3909)
  • Aircraft fuel (kerosene), hydraulic fluid (phosphate base), lubricant (synthetic oil), isopropyl alcohol (cleaner), de‑icing fluid (ethylene glycol).
• Apparatus
  • Required: burner, test fixture, and test fluids.
  • Burner requirements (ISO 2685 Annex A or equivalent):
    • Minimum burner width 50 mm; cable exposed length 152 mm.
    • Flame temperature (1100 ± 80) °C.
    • Heat flux to calorimeter (116 ± 10) kW/m².
    • Flame base width ≥ 2× cable diameter.
  • Test fixture: vibrating frame, vibration perpendicular to cable axis at (30 ± 5) Hz and minimum acceleration 4 g.
  • Mechanical arrangement: sample wrapped once with two nickel‑chrome ribbons; ribbons inner edges spaced (25 ± 5) mm.
• Electrical setup and acceptance
  • Line current approx. 2 A; a test switch should indicate 25 mA when depressed.
  • Leakage current must not exceed 12.5 mA during test (equivalent to ~10 000 Ω insulation resistance).
  • Continuous monitoring of continuity and insulation resistance before, during and after test.
• Test duration
  • 5 minutes for fire‑resistant cables.
  • 15 minutes for fire‑proof cables.
• Circuit arrangements
  • Diagrams and procedures provided for single‑core, multi‑core and screened cables to verify core‑to‑core and core‑to‑screen integrity.

Applications and users

• Cable and wire manufacturers validating fire‑resistant/aerospace cable designs.
• Aerospace test laboratories performing certification or qualification testing.
• Aircraft OEMs, suppliers, procurement and quality engineers requiring compliance evidence.
• Certification bodies and maintainers verifying in‑service cable integrity and safety.
• Useful for designers specifying cable systems in designated fire zones of aircraft.

Related standards

• ISO 2685:1998 - Environmental test procedure for airborne equipment - Resistance to fire in designated fire zones (burner and calorimeter references).
• EN 3909 - Aerospace series - Test fluids for electric components and sub‑assemblies.

Keywords: EN 3475-408, aerospace cable fire resistance, fire-proof electrical cables, aircraft cable test method, cable fire testing, ISO 2685, EN 3909.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2006
$HURQDYWLND±(OHNWULþQLNDEOL]DXSRUDERY]UDþQLKSORYLOLK±3UHVNXVQHPHWRGH±
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Aerospace series - Cables, electrical, aircraft use - Test methods - Part 408: Fire
resistance
Luft- und Raumfahrt - Elektrische Leitungen für Luftfahrtverwendung - Prüfverfahren -
Teil 408: Feuerbeständigkeit
Série aérospatiale - Câbles électriques a usage aéronautique - Méthodes d'essais -
Partie 408 : Résistance au feu
Ta slovenski standard je istoveten z: EN 3475-408:2005
ICS:
49.060
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3475-408
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2005
ICS 49.060
English Version
Aerospace series - Cables, electrical, aircraft use - Test
methods - Part 408: Fire resistance
Série aérospatiale - Câbles électriques à usage Luft- und Raumfahrt - Elektrische Leitungen für
aéronautique - Méthodes d'essais - Partie 408 : Résistance Luftfahrtverwendung - Prüfverfahren - Teil 408:
au feu Feuerbeständigkeit
This European Standard was approved by CEN on 12 September 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3475-408:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Preparation of specimens .4
4 Apparatus .4
5 Method .5
6 Requirements .8

Foreword
This European Standard (EN 3475-408:2005) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-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
AECMA, 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 May 2006, and conflicting national standards shall be withdrawn at the
latest by May 2006.
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.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and the United Kingdom.
1 Scope
This standard specifies a method of testing the fire resistance of "fire-proof" electrical cables.
...