ASD-STAN PREN 6059-309-2016 Aerospace series Electrical cables installation Protection sleeves Test methods Part 309 Fire resistance when fitted on a cable bundle (Edition P 1).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 6059-309 Edition P 1 September 2016 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Descriptors: EN

2、GLISH VERSION Aerospace series Electrical cables, installation Protection sleeves Test methods Part 309: Fire resistance when fitted on a cable bundle Luft- und Raumfahrt Elektrische Leitungen, Installation Schutzschluche Prfverfahren Teil 309: Feuerbestndigkeit wenn um Kabelbndel installiert Srie a

3、rospatiale Cbles lectriques, installation Gaines de protection Mthodes dessais Partie 309 : Rsistance au feu une fois installe sur un toron des cbles This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe

4、 - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that in

5、terchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for for

6、mal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This

7、 document is published by ASD-STAN for the needs of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN re

8、views each standard and technical report at least every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored i

9、n a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1st September

10、2016 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2016 ASD-STAN prEN 6059-309:2016 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Specimen composition 3 4 Preparation of specimens 4 5 Apparatus. 5 6 Method 6 7 Pr

11、ocedure 7 8 Requirements . 7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Pub

12、lication. prEN 6059-309:2016 (E) 3 1 Scope This standard specifies a method of testing the fire resistance of wire harnesses protected with fire resistant sleeve for aerospace application. 2 Normative references The following documents, in whole or in part, are normatively referenced in this documen

13、t 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 3909, Aerospace series Test fluids for electrical and optical components and sub-assemblies

14、ISO 2685:1998, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designated fire zones 3 Specimen composition Standard cable = Type of non-fire proof/resistant cables, shall be in accordance with the product standard. Fire resistant electrical harness built with non-

15、fire resistant wires protected by a fire resistant external envelope. Standard bundle: A. Bundle Figure 1 shall be made at least with twisted pairs AWG24 and jacketed shielded twisted pairs AWG24 standard cables. The bundle diameter shall be less than or equal to 10 mm. Bundle shall be twisted with

16、a maximum twisting pitch of twice diameter of the burne. The fireproof external envelope shall be installed in accordance with the installation specification. Other bundles if requested: B. Bundle shall be made at least with twisted pairs AWG24 and shielded twisted pairs AWG24 standard cables in ext

17、ernal position of the bundle. The bundle diameter shall be greater than or equal to 20 mm. The fireproof external envelope shall be installed in accordance with its installation specification. C. Bundle with specific cables or specific composition. Specific cables shall face the burner. Bundle shall

18、 be twisted with a minimum twisting pitch of 300 mm or twice the bundle diameter. The fireproof external envelope shall be installed in accordance with its installation specification. D. Bundle with shield. The fireproof external envelope shall be installed in accordance with its installation specif

19、ication. prEN 6059-309:2016 (E) 4 4 Preparation of specimens 4.1 Equipotentials Preparation of the equipotentials The conductors of the same equipotential shall be short-circuited at the extremity (conductors in parallel). See Figure 2. Sigle core Jacketed twisted pair Jacketed screened twisted pair

20、 Figure 1 Typical standard A bundle Equipotential 1 = Half chosen at random of the single core cables (if applicable) and the red wires of the non-shielded pairs. Equipotential 2 = The other half of the single core cables (if applicable) and all the left wires of the non-shielded pairs. Equipotentia

21、l 3 = All the single core cables (if applicable) and red wires of the shielded pairs. Equipotential 4 = One core of the specific cables (if applicable) or else all the left wires of the shielded pairs. Equipotential 5 = The left core of the specific cables (if applicable). Equipotential 6 = External

22、 and individual shields. prEN 6059-309:2016 (E) 5 4.2 Dimensions See Figure 2. Key 1 Equipotential 2 2 Equipotential 1 3 Equipotential 6 4 Identification 5 Equipotential 3 6 Equipotential 4 7 Equipotential 5 Figure 2 Typical bundle configuration 4.3 Number of specimens Specimens for test without con

23、ditioning: One (1) straight specimen (type A); One (1) specimen of each bundle types B, C and/or D as specified in the product standard. Specimens for test with conditioning: One (1) straight specimen (Type A) per fluid. 5 Apparatus 5.1 List of apparatus The following shall be required for this test

24、: a burner, a test fixture, and test fluids. prEN 6059-309:2016 (E) 6 5.2 Burner The burner shall be as described in Annex A of ISO 2685 (6 inch gas burner). Specimen length exposed to the flame: 150 mm; Flame temperature: 1 100 C 80 C measured 75 mm above the burner; Heat flux density received by t

25、he calorimeter described in Annex B of ISO 2685: (116 10) kW/m2. 5.3 Test fixture Refer to Figures 3 and 4. The distance between the burner and the under side of the cable under test shall be 70 mm to 80 mm. The frame of the test fixture shall be vibrated with the following characteristics: Directio

26、n perpendicular to the axis of the cable; Frequency: (30 5) Hz; Minimum acceleration: 4 g. 5.4 Fluids The test fluids listed below shall be in accordance with EN 3909. Aircraft fuel (kerosene); Hydraulic fluid (phosphate base); Lubricant (synthetic oil). 6 Method 6.1 Conditioning The conditioning is

27、 only applicable to the test specimens which are to be exposed to fluid contamination. At ambient temperature the centre 300 mm m section of each specimen shall be heavily soaked five times by pouring fluid over the specimen in the fluid (see Figure 3). Each soaking is to be spaced 10 minutes apart.

28、 After soaking the specimen shall be rested for between 16 h to 24 h, then any surplus fluid shall be removed with a lint free tissue. 6.2 Preparation The test shall be conducted in still air. Each sample shall be mounted onto a frame as shown in Figure 4. Test assembly shall be adjusted so that the

29、 low side of the specimen is in the 1 100 C flame temperature zone. prEN 6059-309:2016 (E) 7 The sample shall be weighted, as shown in Figure 4, to maintain it straighten and without sag during vibrations. Each equipotential shall be connected to a circuit as shown in Figure 5. 7 Procedure The targe

30、t is to record the insulation resistance between equipotentials and to measure the time to reach the minimum insulation resistance value according to the requirement. The test consists to measure according to the hereafter sequence, the insulation resistance between: Equipotential 1 with equipotenti

31、al 2; Equipotential 1 with equipotential 6; Equipotential 3 with equipotential 4; Equipotential 3 with equipotential 6; Equipotential 4 with equipotential 5 (if applicable). This sequence shall be repeated permanently during the whole duration test. The continuity of each conductor shall be conform

32、before test Circuit diagram shall be in accordance with Figure 5 where circuit X is the first indicated equipotential and circuit Y is the second indicated equipotential. Time to make one sequence (five (5) measurements) shall be less than 2,5 seconds. Flame time, the five (5) measurements and the f

33、lame temperature shall be recorded for each sequence. Result shall be presented as a curve (linear scale for the time, logarithmic scale for the insulation resistance) Each sample shall be simultaneously subjected to the combined flame and vibration test. The test duration shall be: Five (5) minutes

34、 for fire resistant harnesses; 15 minutes for fire proof harnesses. 8 Requirements Check electrical continuity Draw five (5) curves of insulation resistance in function of the time. All the points of curves must be above 10 k during the specified time: Five (5) minutes for fire resistant harnesses;

35、15 minutes for fire proof harnesses. prEN 6059-309:2016 (E) 8 Key 1 Harness test specimen 2 Soaked zone 3 Container Figure 3 Moistening procedure Key 1 Vibratory frame 2 Harness test specimen 3 Weight 4 Test burner Figure 4 Test fixture prEN 6059-309:2016 (E) 9 Key 1 Circuit X 2 Circuit Y Figure 5 C

36、ircuit diagram Vc.a., R1 and Um shall be chosen to allow a measurement of an isolation resistance scale from 1 k to 100 M. The test voltage shall be (60 10) V between circuits with a maximum short circuit current of 10 A. The continuity indicator load R2 and lamp L shall limit the standing current to be less than 0,5 A. Equivalent apparatus can be used.