Bsi bs en 06059 502 2014

BS EN 6059-502:2014 BSI Standards Publication Aerospace series — Electrical cables, installation — Protection sleeves — Test methods Part 502: Resistance to electrical arcs BS EN 6059-502:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 6059-502:2014 It supersedes BS EN 6059-502:2009 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 86332 ICS 49.060 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2014 Amendments issued since publication Date Text affected BS EN 6059-502:2014 EN 6059-502 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM December 2014 ICS 49.060 Supersedes EN 6059-502:2009 English Version Aerospace series - Electrical cables, installation - Protection sleeves - Test methods - Part 502: Resistance to electrical arcs Série aérospatiale - Câbles électriques, installation - Gaines de protection - Méthodes d'essais - Partie 502: Résistance aux arcs électriques Luft- und Raumfahrt - Elektrische Leitungen, Installation Schutzschläuche - Prüfverfahren - Teil 502: Lichtbogenfestigkeit This European Standard was approved by CEN on 28 June 2014 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 6059-502:2014 E BS EN 6059-502:2014 EN 6059-502:2014 (E) Contents Page Foreword Scope Normative references Specimen requirements 4 4.1 4.2 4.3 Definition and preparation of specimen Protected bundle (bundle P) Aggressive bundle (bundle A) Test configuration 5.1 5.2 5.3 5.4 Apparatus .8 Electrical equipment Test equipment 10 Test protocol 10 Test rig set-up 10 6.1 6.2 6.3 Method 11 Test Procedure 11 Examination 12 Test report 12 Requirements 12 BS EN 6059-502:2014 EN 6059-502:2014 (E) Foreword This document (EN 6059-502:2014) 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 June 2015, and conflicting national standards shall be withdrawn at the latest by June 2015 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 This document supersedes EN 6059-502:2009 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 6059-502:2014 EN 6059-502:2014 (E) Scope This European Standard specifies a method of assessing the behaviour of protection sleeves or conduits subject to an external electric arc, either at 115 Vac or 230 Vac 400 Hz This Standard shall be used together with EN 6059-100 The primary aim of this test is to produce, in a controlled fashion, electric arcs at the immediate vicinity of a protection sleeve or conduit and to examine possible consequences on cables inside this protection, which are supposed to be maintained in a safe condition These electric arcs are representative of those, which may occur in service when a typical cable bundle is severely damaged In order to optimize thickness and mass of such protection, it is necessary to associate a current limit In to each sleeves or conduits construction Two levels of prospective fault current are specified for all protection sizes Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 2267-010, Aerospace series — Cables, electrical, for general purpose — Operating temperatures between − 55 °C and 260 °C — Part 010: DR family, single UV laser printable — Product standard EN 2350, Aerospace series — Circuit breakers — Technical specification EN 3475-302, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 302: Voltage proof test EN 6059-100, Aerospace series — Electrical cables, installation — Protection sleeves — Test methods — Part 100: General EN 6059-501, Aerospace series — Electrical cables, installation — Protection sleeves — Test methods — Part 501: Voltage proof test A-A-52083, Specification for tape lacing and tying 1) Specimen requirements Protection sleeves or conduits to be tested shall be of traceable origin and, unless otherwise specified, shall have passed the voltage proof test (EN 6059-501) as defined in the concerned product standard Unless otherwise specified in the concerned technical product standard, at least one size of protection sleeve per sleeve thickness or construction type (if different from one size to another) shall be assessed If possible for each thickness or construction type the test must be performed on a sample having the minimum authorized thickness or minimum authorized mass 1) Published by: Customer Service, Defense Printing Service Detachment Office, 700 Robbins Ave, Building 4D, Philadelphia PA 19111-5094 USA BS EN 6059-502:2014 EN 6059-502:2014 (E) Definition and preparation of specimen 4.1 Protected bundle (bundle P) Bundles P are made of arc tracking resistant cables, typically from EN 2267-010 product standard unless otherwise specified in the concerned protection sleeves product standard, with bundle external protection to be tested The cable bundle outer diameter shall be as closed as possible to the internal diameter of the protection to be tested This diameter is obtained:  with a full assembly of size 24 cables, or  with a central part in various cable types covered with a full and uniform layer of size 24 cables The sleeve shall be fitted in accordance with the manufacturer’s declared fitting instructions 4.2 Aggressive bundle (bundle A) 4.2.1 Definition and constitution Bundles A are made of arc-tracking resistant cables, typically from EN 2267-010 product standard unless otherwise specified in the concerned protection sleeves product standard, without bundle external protection The short circuit will be created on these bundles (see 4.3) The cables gauge is chosen in Table 1, in accordance with the In limit specified for the protection sleeves Table — Choice of cable gauge CB ratings (A) 7,5 10 10 15 20 25 50 Gauge 26 24 22 20 18 16 14 12 10 Circuit breaker used to protect these cables must be also in accordance with Table EXAMPLE If the sleeve must provide a 15 A protection, take gauge 16 cables to built the bundle with 15 A CB ratings For information the diameter of the bundle will be three times the cable diameter 4.2.2 Preparation Cut seven separate lengths of approximately 0,5 m consecutively from one length of cable, and strip one of the ends of insulation to permit electrical connection Clean each length of cable with a clean cloth moistened with propan-2-ol (isopropyl alcohol) fluid 4.2.3 Lay up the seven cables as follows: a) Form the cables in a six around one configuration as shown in Figure b) Ensure that all cables are straight and geometrically parallel, and restrained by ties such that they are in continuous contact at least within the test zone BS EN 6059-502:2014 EN 6059-502:2014 (E) c) Position the ties at 50 mm spacing toward the end of the specimen as shown in Figure NOTE The tie material shall be PTFE glass lacing tape conforming to A-A-52083, finish D size A1-A2 : phase A B1-B2 : phase B C1-C2 : phase C N : Neutral cable connected to earth Key Drop needle Figure — Bundle A – Electrical configuration Key Glass lacing ties Drop needle Drops 10 mm to 20 mm Ends of the cables in the same plane Figure — Configuration of bundle A BS EN 6059-502:2014 EN 6059-502:2014 (E) 4.3 Test configuration The bundle A shall be attached on bundle P by qualified tyraps, according to the following Figures and For protective materials with a join or overlap the bundle A shall be so positioned that the energy from any arc is applied to the minimum material thickness part of the protective material Key Ends of the cables in the same plane 10 mm to 20 mm Cable ties Tyraps Two attachment points Length and end of bundle sample to be define with mechanical test setup Drops Bundle P Bundle A Figure — Test bundles configuration BS EN 6059-502:2014 EN 6059-502:2014 (E) Key Bundle P Drip needle Bundle A Figure — Test configuration Apparatus 5.1 Electrical equipment 5.1.1 For 115 Vac 400 Hz network Connect the seven cables of the test sample within a circuit as shown in Figure This circuit shall have the following requirements: a) The provision of adjustable levels of prospective fault currents for the six A, B and C cables b) A three phase 200/115 V 400 Hz star (Y) connected supply shall be derived from a dedicated rotary machine capable of sustaining the maximum prospective fault current given in Table for at least sufficient time for circuit protection to operate In any case the generator shall have a rating of not less than 20 kVA c) Circuit breakers shall be rated as given in Table and shall be single pole units They shall have trip characteristics in accordance with EN 2350 or as required in the product specification NOTE In particular case, others ratings of thermal breaker protection could be employed in accordance with aircraft manufacturer rules d) The electrical power source shall be appropriately protected and it shall be established that no combination of test circuit events would activate this protection BS EN 6059-502:2014 EN 6059-502:2014 (E) e) The ballast Rb resistors shall be non-inductive and of appropriate power rating Care shall be taken to position all laboratory wiring such that inductive effects are reduced to a practical minimum Supply cables shall be as short as possible The ballast resistor Rb is in order to prevent over voltage (115 Ω - 115 W per phase) during the arc extinction phases (opening of an inductive circuit) f) A rheostat, Rf, limiting maximum short-circuit current per phase by simulating a line length g) Appropriate instrumentation, recording and switching control shall be installed in accordance with good laboratory practice Key Supply protection Test bundle Figure — Test schematic circuit 5.1.2 For 230 Vac 400 Hz network a) Apply 5.1.1 with the following modifications:  in b) replace “200/115 V 400 Hz” by “400/230 V 400 Hz”,  in e) replace “115 Ω - 115 W per phase” by “230 Ω - 230 W per phase” BS EN 6059-502:2014 EN 6059-502:2014 (E) b) Except if CBs are defined for 230 Vac uses, before starting tests, there must be CB preliminary verifications:  verify each CB voltage drop under his nominal intensity  make a short-circuit directly on the terminals of each CB with a shunt without resistance  verify again the voltage drop  repeat this cycle five times  there must be no significant variations in the voltage drop values  if variations or bad tendency occur, CB must be changed after each tripping 5.2 Test equipment Construct an apparatus as shown diagrammatically in Figures 2, and which includes the following minimum provisions: a) Electrical terminations to provide a ready means of connecting test specimens into the circuit as shown in Figure b) A transparent enclosure to protect personnel from ejected molten metal and short wavelength ultra violet light c) An electrolyte delivery system which provides a constant rate of (100 ± 10) mg/min and dispenses drops from an 18 gauge needle, cut of square at the outlet NOTE The needle wall thickness shall be selected such that the specified flow rate shall be delivered at approximately six drops per minute 5.3 Test protocol 5.3.1 The procedure embraces at least one size of protection sleeve per sleeve thickness or construction type and for each two values of prospective fault current, to be set by adjustment of resistances Rf have been defined in Table Performance of the protection at a given maximum fault current shall be determined by testing three specimens Thus six specimens are required for each protection size 5.3.2 Additional testing of other sizes may be deemed necessary in particular cases and values of prospective fault currents, the ratings of thermal breaker protection which are typical of aircraft use have been included in Table 5.3.3 It is emphasized that electrical arcing tests are essentially destructive and can be hazardous to personnel Therefore tests should be undertaken with all observers shielded from direct physical and visual exposure as noted in 5.2 b) The use of video recording for all tests is required 5.4 5.4.1 Test rig set-up Install the rating of circuit breaker appropriate to the cable size used for the test (Table 2) 5.4.2 Heavy duty electrical shorting connections shall be fitted in substitution of a test sample to enable prospective fault currents to be set by adjustment of resistances Rf Because these currents would trip the thermal breakers very rapidly these shall be shunted to permit the pulsing of current until the desired value is obtained Re-instate the thermal protection 10 BS EN 6059-502:2014 EN 6059-502:2014 (E) 5.4.3 Prepare a solution in distilled or de-ionized water of % by mass of ammonium chloride and (0,1 ± 0,01) % by mass of isooctylphenolpolyethoxyethanal, the polyethoxy chain to contain approximately 10 ethoxy units (triton ×-100) Exceptionally, in the circumstances given in 6.1.2, the surfactant may be changed to ammonium perfluoroalkane carboxylate, e.g 3M FC 126 or FC 143, at a concentration of (0,1 ± 0,01) % by mass 5.4.4 Support the specimen in free air inclined at an angle of 10° to the horizontal with the electrical input connections at the higher end 5.4.5 Position the delivery system so that the electrolyte contacts the loom from a height of (10 ± 2) mm above the uppermost cables in the loom at a point which allows the solution to run along the cables so that it wets the exposed conductor ends Ensure that the drops strike the cables at the top centre of the circumference such that they fall into the crevice between cables A1 and B1 Method 6.1 Test Procedure 6.1.1 Install a test specimen with electrical connections as shown in Figure and with Rf set, as in 5.4.2 above, to give the required fault current specified in Table Table — Prospective fault currents Wire size 001 002 004 060 010 012 020 030 050 AWG a 26 24 22 20 18 16 14 12 10 CB Ratings 7.5 10 10 15 20 25 50 In 10 15 20 20 30 40 50 100 10 In 30 50 75 100 100 150 200 250 500 Prospective fault currents a Closest American Wire Gauge 6.1.2 Apply electrical power to the specimen and start the flow of electrolyte at a rate of (100 ± 10) mg/min Particular care should be taken to ensure that the electrolyte flows between the damage sites as the evidenced by the steaming of the electrolyte and the development of scintillation Shall this not occur, and failure of the cable to wet be determined, then the alternative surfactant described in 5.4.3 may be used 6.1.3 Run the test continuously for a period of h or until an automatic shut down (CB tripping occurs) If bundle A is so eroded that the drip is no longer applied to it continue the test for 30 or until the end of the test period whichever is the sooner (Note if no electrical action starts to occur within 10 of starting the test then the drip position shall be adjusted to ensure that the solution is wetting the cut cable ends) 6.1.4 In the event of an automatic shutdown adopt the following procedure: a) After not less than min, nor more than 10 min, and with all thermal circuit breakers closed, reapply power to the specimen with the automatic trip circuit deactivated and with no further flow of electrolyte b) Maintain the power for 15 to allow any fault condition to develop fully but not reset any of the thermal circuit breakers 6.1.5 Repeat the test to obtain three tested specimens and then repeat the procedure for all the fault currents until all specimens have been tested 11 BS EN 6059-502:2014 EN 6059-502:2014 (E) 6.2 Examination 6.2.1 Carefully remove bundle A from the apparatus and photograph the protected bundle P in the shortcircuit area 6.2.2 Damage on bundle P shall be analysed by visual examination or microscope x10 if necessary:  on the external protection,  on the bundle after removing the external protection,  on each cables 6.2.3 With minimal mechanical disturbance to the test specimen, carry out a voltage proof test EN 3475-302 – Immersion test with a voltage of 000 V, on each of the cables which were in direct contact with the protection in the short circuit area 6.3 Test report The test report shall include details of the following: a) Identity of the protection type and details of the origin and release certification permitting traceability to product batch b) Record if tests are done under 115 Vac or 230 Vac 400 Hz c) Characteristics of power source d) Operation of individual circuit breakers e) Record the damage as required in 6.2.2 and the result of the voltage test required in 6.2.3 f) References of cables used in each bundles Requirements The detail product specification shall define the tension and the protection sizes to be tested and the pass/ fail criteria for each protection size, in any series of tests In any case the protection shall not ignite to the extent that it would fail the flammability after-burn and char length requirements of the related product specification 12 This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW 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