1、BS EN 2812:2009ICS 49.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAerospace series Stripping of electric cablesThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 30September 2009 BSI 2009ISBN 978 0 58
2、0 68925 3Amendments/corrigenda issued since publicationDate CommentsBS EN 2812:2009National forewordThis British Standard is the UK implementation of EN 2812:2009. The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnolog
3、y.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom
4、legal obligations.BS EN 2812:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 2812August 2009ICS 49.060English VersionAerospace series - Stripping of electric cablesSrie arospatiale - Dnudages des cbles lectriques Luft- und Raumfahrt - Abisolieren von elektrischenLeitungenThis European Standard
5、 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 nat
6、ionalstandards 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 no
7、tified 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, Mal
8、ta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitat
9、ion in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2812:2009: EBS EN 2812:2009EN 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 Qualificati
10、on .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 BS EN 2812:2009EN 2812:2009 (E) 3 Foreword This document (EN 2812:2009)
11、 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
12、 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 Fe
13、bruary 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
14、 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, Portug
15、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 2812:2009EN 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
16、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
17、) 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 20
18、83, 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 cond
19、uctors 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 Str
20、ipping 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,
21、 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 publicatio
22、n of this standard. BS EN 2812:2009EN 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 m
23、ust 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.
24、 3.2.2 Application Manual stripping by scalpel, razor blade or other cutting tool is carried out on cables over 5 mm2cross-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
25、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 (Inform
26、ative). 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 cut
27、ting 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
28、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. BS EN 2812:2009EN 2812:2009 (E) 6 Particular care is necessary during the use of rotating blades, and their depth shall be adjustable to adapt
29、 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
30、 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 abl
31、e 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 scre
32、en 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 flammab
33、le 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
34、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
35、be completed by inspection of samples of stripped cable ends, see 5.3.1. BS EN 2812:2009EN 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 ha
36、ve an individual inspection sheet including: its identification number; date of first commissioning; dates of successive inspections; dates of rectification or repair; numbers of associated blades. 4.2.2 Inspection The inspection of blades is carried out with the aid of measuring gauges, shadowgraph
37、, calipers or other means permitting confirmation that the cavities are in accordance with the dimensions specified. The inspection shall be completed by checking the mechanical condition of the manual tool or power tool and by stripping tests, followed by inspection of samples of stripped cable end
38、s, see 5.3.2. For the routine inspection of production tools, the gauging of blades may be omitted, provided double stripping is used for the inspection of stripped cable ends. Stripping tools shall be inspected at least every 90 days. If a worn blade requires replacement, the complete blade assembl
39、y shall always be replaced together. 4.2.3 Calibration Some particular tools, for coaxial cables for example, may require calibration to obtain the necessary diameter to strip. 4.3 Laser stripping tools 4.3.1 Identification An identification number shall be permanently marked on the main body of the
40、 tool. In addition, each tool shall have an individual inspection sheet including: its identification number; date of first commissioning; dates of successive inspections; dates of rectification or repair; numbers of associated parts. BS EN 2812:2009EN 2812:2009 (E) 8 4.3.2 Inspection The inspection
41、 shall be completed by checking the general behaviour of the laser tool accordingly to the laser tool manufacturer instructions and by stripping tests, followed by inspection of samples of stripped cable ends, see 5.3.3. Laser tools shall be inspected at least every 90 days. 4.3.3 Calibration Period
42、ic laser power checks shall be made to ensure power levels remain within the limits as defined by the manufacturers specification. 4.4 Thermal stripping tools 4.4.1 Identification An identification number shall be permanently marked on the main body of the tool. In addition, each stripping tool shal
43、l have an individual inspection sheet including: its identification number; date of first commissioning; dates of successive inspections; dates of rectification or repair; numbers of associated parts. 4.4.2 Inspection The inspection shall be completed by checking the general behaviour of the thermal
44、 tool according to the thermal tool manufacturer instructions and by stripping tests, followed by inspection of samples of stripped cable ends, see 5.3.4. Thermal tools shall be inspected at least every 90 days. 4.4.3 Calibration Periodic calibration checks of the tool shall be made to ensure power
45、levels, and consequently temperature at the tip of the respective blade remain within the limits as defined by the manufacturers specification. 5 Qualification 5.1 General Wires and cables must be strippable as normally defined in their technical specification or product standard. The test method ge
46、nerally used to assess this is EN 3475-701. The stripping operation must remove the insulator from the conductor over a length defined with tolerances, to allow correct connection of cables, without damaging the core strands or the screen or the insulator and without reducing the original performanc
47、es of the cable as defined in its technical specification. The stripping length depends on the length required to connect the conductor into the end component. BS EN 2812:2009EN 2812:2009 (E) 9 Each process must be applied by trained operators. For qualification to a wire and cable standard, there m
48、ust be an agreement between the wire and cable manufacturer and the qualifying authority on exact tool reference to use. The exact reference of this tool must be written in the associated test report. 5.2 Method Qualification of a dedicated tool to strip a cable type will be performed by stripping o
49、f samples coming from at least two different batches (ideally for manual stripping pliers used for single wires, batches shall have conductors not coming from the same conductor batch, and if possible one at the maximum conductor diameter and the other at the minimum). The inspection of stripped cable ends, for which the tool will be used, shall be carried out on 10 samples coming from the same manufacturing batch for each cable size. Five samples will have one stripping at each extremity and the other 5 samples a doubl
