EN 4703:2022
(Main)Aerospace series - Test specification for verification of the permeability of electrical insulation
Aerospace series - Test specification for verification of the permeability of electrical insulation
This document specifies a test that determines the ability of electrical equipment to withstand wet atmospheres in combination with variable ambient air pressure in particular in an aircraft installation. The main adverse effects to be anticipated are fluid ingress and related insulation breakdown.
Luft- und Raumfahrt - Testverfahren zur Überprüfung der elektrischen Isolationsfestigkeit
Dieses Dokument legt eine Prüfung fest, die die Fähigkeit elektrischer Geräte bestimmt, feuchten Atmosphären in Kombination mit wechselndem Luftdruck in der Umgebungsluft, insbesondere in einer Flugzeuginstallation, zu widerstehen. Die wichtigsten zu erwartenden nachteiligen Auswirkungen sind das Eindringen von Flüssigkeit und der damit verbundene Ausfall der Isolierung.
Série aérospatiale - Spécification d’essai pour la vérification de la perméabilité de l’isolation électrique
Le présent document spécifie un essai qui détermine la capacité des équipements électriques à résister aux atmosphères humides combinées à une pression atmosphérique ambiante variable, en particulier dans une installation d'aéronef. Les principaux effets indésirables à prévoir sont la pénétration de fluides et la rupture d'isolement qui en découle.
Aeronavtika - Specifikacija preskusa za preverjanje prepustnosti izolacije električne opreme
Ta dokument določa preskus za določitev sposobnosti električne opreme, da prenese vlažno okolje v kombinaciji s spremenljivim tlakom zunanjega zraka, zlasti v letalih. Glavna škodljiva učinka, ki ju je mogoče predvideti, sta vdor tekočine in s tem povezan izpad izolacije.
General Information
- Status
- Published
- Publication Date
- 20-Dec-2022
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 12/WG 3 - Cabin monuments and supply systems
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 21-Dec-2022
- Completion Date
- 21-Dec-2022
Overview
EN 4703:2022 is a European aerospace standard developed by CEN to specify test methods for verifying the permeability of electrical insulation in aerospace electrical equipment. This standard addresses the critical requirement of ensuring electrical insulation integrity under wet atmospheric conditions combined with varying ambient air pressure, typical in aircraft environments. The primary concern is to evaluate fluid ingress and the resulting insulation breakdown to guarantee safety and reliable operation of electrical systems in aerospace applications.
The standard defines procedures for testing insulation resistance and sheath integrity, providing a comprehensive framework for manufacturers and quality assurance teams to assess electrical insulation performance under simulated real-world aircraft conditions.
Key Topics
Test Environment and Setup
- Testing is conducted in a controlled chamber at temperatures between 15 °C and 35 °C.
- The Unit Under Test (UUT) is immersed in tap water with dissolved NaCl to achieve a conductivity of approximately 1 mS/cm, simulating wet atmospheres.
- Two main test set-ups are specified:
- HV Insulation Resistance Measurement to assess resistance between live parts and their shielding using a high voltage insulation resistance tester compliant with ISO 2678.
- Sheath Integrity Measurement to evaluate the insulation between conducting parts and an external electrode, employing an LCR meter measuring capacitance, phase angle, and resistance.
Test Procedures
- The UUT is subjected to cycles of reduced and ambient pressure mimicking aircraft altitude pressure changes.
- Each cycle lasts 180 minutes; 8 cycles are performed daily for a minimum duration of 30 days, totaling 240 cycles.
- Insulation resistance and sheath integrity measurements are taken at specified intervals including the start, during, and at the conclusion of testing.
Pass/Fail Criteria
- Insulation resistance must meet or exceed minimum values outlined in ISO 2678 for non-climatic conditions.
- Sheath integrity parameters must comply with strict benchmarks for capacitance, phase angle, and parallel resistance detailed in the standard.
Receptacle Immersion Categories and Operation States
- The standard provides guidelines on immersion levels of connectors/receptacles (fully immersed, partially immersed, or not immersed) to cover various installation scenarios.
- Operation states of the UUT during testing include operated, powered but not operated, or non-powered.
Applications
EN 4703:2022 is essential for aerospace manufacturers, suppliers, and testing laboratories focusing on:
- Aircraft Electrical Systems: Ensuring electrical components such as wiring harnesses, connectors, and insulation materials maintain dielectric integrity under moisture and pressure stress.
- Safety Compliance: Verifying electrical insulation durability to mitigate risks of fluid ingress and insulation failure that could lead to short circuits, equipment damage, or safety hazards in aircraft.
- Design Validation: Providing manufacturers with test protocols to validate new insulation materials or designs in real flight environmental conditions before certification.
- Quality Assurance and Maintenance: Applying standardized testing to periodic checks of in-service electrical equipment to maintain operational reliability and airworthiness.
Related Standards
- ISO 2678: Environmental tests for aircraft equipment - Specifies insulation resistance and high voltage tests for electrical equipment, serving as the basis for insulation resistance measurement in EN 4703.
- IEC Electropedia: Offers standardized terminology pertinent to electrical insulation testing referenced in the document.
- ASD-STAN Aerospace Standards: As EN 4703 was prepared under the Aerospace and Defence Industries Association of Europe, cross-reference with other ASD-STAN standards can provide comprehensive aerospace electrical testing frameworks.
Keywords: EN 4703:2022, electrical insulation permeability, aerospace electrical equipment, insulation resistance test, sheath integrity measurement, wet atmosphere testing, variable air pressure, aircraft electrical safety, aerospace standards, CEN aerospace testing, electrical insulation breakdown, aircraft installation testing.
Frequently Asked Questions
EN 4703:2022 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Test specification for verification of the permeability of electrical insulation". This standard covers: This document specifies a test that determines the ability of electrical equipment to withstand wet atmospheres in combination with variable ambient air pressure in particular in an aircraft installation. The main adverse effects to be anticipated are fluid ingress and related insulation breakdown.
This document specifies a test that determines the ability of electrical equipment to withstand wet atmospheres in combination with variable ambient air pressure in particular in an aircraft installation. The main adverse effects to be anticipated are fluid ingress and related insulation breakdown.
EN 4703:2022 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.
You can purchase EN 4703:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2023
Aeronavtika - Specifikacija preskusa za preverjanje prepustnosti izolacije
električne opreme
Aerospace series - Test specification for verification of the permeability of electrical
insulation
Luft- und Raumfahrt - Testverfahren zur Überprüfung der elektrischen Isolationsfestigkeit
Série aérospatiale - Spécification d’essai pour la vérification de la perméabilité de
l’isolation électrique
Ta slovenski standard je istoveten z: EN 4703:2022
ICS:
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 4703
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 49.060
English Version
Aerospace series - Test specification for verification of the
permeability of electrical insulation
Série aérospatiale - Spécification d'essai pour la Luft- und Raumfahrt - Testverfahren zur Überprüfung
vérification de la perméabilité de l'isolation électrique der elektrischen Isolationsfestigkeit
This European Standard was approved by CEN on 22 August 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4703:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test set-up . 4
4.1 General set-up . 4
4.1.1 General. 4
4.1.2 Test set-up 1: HV-insulation resistance measurement . 4
4.1.3 Test set-up 2: Sheath integrity measurement . 5
4.2 Immersion of receptacle . 6
4.3 Operation of test unit . 7
5 Test procedure . 8
6 Pass/fail criteria . 9
7 Designation . 10
European foreword
This document (EN 4703:2022) 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 document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, 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 June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
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.
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, Republic of North Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
the United Kingdom.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
1 Scope
This document specifies a test that determines the ability of electrical equipment to withstand wet
atmospheres in combination with variable ambient air pressure in particular in an aircraft installation.
The main adverse effects to be anticipated are fluid ingress and related insulation breakdown.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 2678, Environmental tests for aircraft equipment — Insulation resistance and high voltage tests for
electrical equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
LCR meter
type of electronic test equipment used to meas
...
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