SIST EN 2812:2009
(Main)Aerospace series - Stripping of electric cables
Aerospace series - Stripping of electric cables
This standard specifies the conditions for stripping and inspection of stripping tools and the stripped ends of electric cables for aerospace applications. Various stripping processes exist. The choice of a process depends upon the properties of the particular cables to be stripped and/or on the specific requirements for the end product to be achieved. The processes specified today in this document are: a) manual stripping; b) mechanical stripping; c) laser stripping; d) thermal stripping.
Luft- und Raumfahrt - Abisolieren von elektrischen Leitungen
Die vorliegende Norm legt die Bedingungen für das Abisolieren und die Überprüfung der Abisolierwerkzeuge
und der abisolierten Enden von elektrischen Leitungen zur Verwendung in der Luft- und Raumfahrt fest.
Es gibt verschiedene Abisolierverfahren. Die Wahl des Verfahrens hängt von den Eigenschaften der einzelnen
abzuisolierenden Leitungen ab und/oder von den besonderen Anforderungen, die vom Enderzeugnis zu
erfüllen sind.
Die heutzutage festgelegten Verfahren sind:
a) manuelles Abisolieren;
b) mechanisches Abisolieren;
c) Laser-Abisolieren;
d) thermisches Abisolieren.
Série aérospatiale - Dénudages des câbles électriques
Aeronavtika - Odstranjevanje izolacije pri električnih kablih
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Abisolieren von elektrischen LeitungenSérie aérospatiale - Dénudages des câbles électriquesAerospace series - Stripping of electric cables49.060Aerospace electric equipment and systemsICS:Ta slovenski standard je istoveten z:EN 2812:2009SIST EN 2812:2009en01-oktober-2009SIST EN 2812:2009SLOVENSKI
STANDARD
SIST EN 2812:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2812August 2009ICS 49.060 English VersionAerospace series - Stripping of electric cablesSérie aérospatiale - Dénudages des câbles électriquesLuft- und Raumfahrt - Abisolieren von elektrischenLeitungenThis European Standard was approved by CEN on 20 June 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2812:2009: ESIST EN 2812:2009
EN 2812:2009 (E) 2 Contents Page Foreword .3 1 Scope .4 2 Normative references .4 3 Stripping processes and associated tools .4 4 Identification, inspection and calibration .6 5 Qualification .8 6 Health, safety and environmental aspects . 10 Annex A (normative) Defects illustrations. 11 Annex B (informative) Mechanical stripping . 13 Annex C (informative) Laser stripping . 14 Annex D (informative) Thermal stripping . 15
SIST EN 2812:2009
EN 2812:2009 (E) 3 Foreword This document (EN 2812:2009) 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 2010, and conflicting national standards shall be withdrawn at the latest by February 2010. 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, 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. SIST EN 2812:2009
EN 2812:2009 (E) 4 1 Scope This standard specifies the conditions for stripping and inspection of stripping tools and the stripped ends of electric cables for aerospace applications. Various stripping processes exist. The choice of a process depends upon the properties of the particular cables to be stripped and/or on the specific requirements for the end product to be achieved. The processes specified today in this document are: a) manual stripping; b) mechanical stripping; c) laser stripping; d) thermal stripping. 2 Normative references 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 2083, Aerospace series — Copper or copper alloy conductors for electrical cables — Product standard. EN 3475-701, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 701: Strippability and adherence of insulation to the conductor. EN 3719, Aerospace series — Aluminium or aluminium alloy conductors for electrical cables — Product standard. EN 4434, Aerospace series — Copper or copper alloy lightweight conductors for electrical cables — Product standard (Normal and tight tolerances). EN 4651, Aerospace series — Copper-clad aluminium alloy conductors for electrical cables — Product standard. 1) 3 Stripping processes and associated tools 3.1 General recommendations Precise definition of tools to use on a particular wire or cable standard is under the responsibility of the user. It is particularly important to know from which ASD Product Norm conductors are coming (for examples: EN 2083, EN 3719, EN 4434, EN 4651) for the mechanical stripping process. Availability of a common tool able to strip different gauges or cable sizes is recommended. If tools are designed for particular applications, differentiation by colours is recommended.
1) Published as ASD Prestandard at the date of publication of this standard. SIST EN 2812:2009
EN 2812:2009 (E) 5 Size and weight of tools has to be appropriate for the envisaged use. When it is essential to control the length of insulation to be removed an adjustable abutment must be part of the tool. 3.2 Manual stripping 3.2.1 Use The use of this process must be strictly limited to insulations and jackets of the cables for which other methods are impractical. Nevertheless, with thermal stripping and the arrival of small laser machines, this manual practice must be progressively eliminated for aerospace use and stay permissible only for small batches. 3.2.2 Application Manual stripping by scalpel, razor blade or other cutting tool is carried out on cables over 5 mm2 cross-section, sheaths of shielded cables, fire-resistant cables and coaxial cables, unless another stripping process is specified. 3.3 Mechanical stripping 3.3.1 Use This process is generally the most used in particular for single wires. Various power tools are also adapted to strip round cables, such as single wire screened jacketed and coaxial, and flat cables. The simplicity of manual pliers makes these tools ideal for work in the field. For illustration, see Annex B (Informative). 3.3.2 Stripping with manual tools The blades of tools can have different profiles and dimensions. Various assembly shapes are now available. A blade can have several marked cavities of different sizes. When the tool is closed, the edges of the blades shall be in the same plane and form a cutting circumference whose diameter is greater than the maximum diameter of the conductor of the cable to be stripped. Blades must be replaced as pairs. The manual stripping tools with V shaped cutting blades or shearing type blades are forbidden (see Figure 1 and Figure 2).
Figure 1 — V shaped cutting blades Figure 2 — Shearing type blades
3.3.3 Stripping with power tools These tools use blades with the same general characteristics as those defined in 3.3.2. SIST EN 2812:2009
EN 2812:2009 (E) 6 Particular care is necessary during the use of rotating blades, and their depth shall be adjustable to adapt the cutting diameter to the need. 3.4 Laser stripping 3.4.1 Use Laser wire stripping can be carried out on wires and cables of any gauge and on jackets. This process is particularly suitable for use in applications where damage of any sort to the conductor or the screen is unacceptable and when the external geometry of the cable to strip is incompatible with mechanical processes. For illustration, see Annex C (Informative). 3.4.2 Application Carbon Dioxide (CO2) lasers are normally used, but other laser types may be applicable for certain applications. Beam power shall be adjustable to be able to cut properly all various types of insulation and shapes. 3.5 Thermal stripping 3.5.1 Use Thermal wire stripping can be carried out on wires and cables of any gauge and on jackets. This process is particularly suitable for use in applications where damage of any sort to the conductor or the screen is unacceptable, when the external geometry of the cable to strip is incompatible with mechanical process and when the size of tooling equipment investment must be limited. This process may not be suitable for all types of insulation or in particular environmental conditions such as where flammable vapours may be present. For illustration, see Annex D (Informative). 3.5.2 Application Generally the tool is in two parts, a generator to control the required temperature and a hand unit. The hand unit can be equipped with various shape of blades. 4 Identification, inspection and calibration 4.1 Manual stripping tools
4.1.1 Identification An identification number marked on the main body is recommended in order to facilitate the follow-up of the inspection of the cutting blade. 4.1.2 Inspection
The inspection of cutting area is carried out visually at regular intervals. The inspection shall be completed by inspection of samples of stripped cable ends, see 5.3.1. SIST EN 2812:2009
EN 2812:2009 (E) 7 4.2 Mechanical stripping tools 4.2.1 Identification
An identification number shall be permanently marked on the main body of the tool and on the blade. In addition, each stripping tool shall have an individual inspection sheet including: its identification number; date of first commissioning; dates of successi
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