1、BSI Standards PublicationCommunication cables Specifications for test methodsPart 4-17: Test methods for UV resistance evaluation of the sheath of electrical and optical fibre cableBS EN 50289-4-17:2015National forewordThis British Standard is the UK implementation of EN 50289-4-17:2015. It supersed
2、es BS EN 50289-4-17:2011 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/46, Cables, wires and waveguides, radio frequency connectors and accessories for communication and signalling.A list of organizations represented on this committee can be obtai
3、ned onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86343 1ICS 33.120.10Compliance with a
4、 British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 50289-4-17:2015EUROPEAN STAND
5、ARD NORME EUROPENNE EUROPISCHE NORM EN 50289-4-17 October 2015 ICS 33.120.10 Supersedes EN 50289-4-17:2011 English Version Communication cables - Specifications for test methods - Part 4-17: Test methods for UV resistance evaluation of the sheath of electrical and optical fibre cable Cbles de commun
6、ication - Spcifications des mthodes dessais - Partie 4-17: Mthodes dessai pour valuer la rsistance aux UV des gaines des cbles lectriques et des cbles fibre optique Kommunikationskabel - Specifikationen fr Prfverfahren - Teil 4-17: Prfverfahren zur Ermittlung der UV-Bestndigkeit der Mntel elektrisch
7、er und optischer Kabel This European Standard was approved by CENELEC on 2015-08-31. CENELEC 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 lis
8、ts and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation u
9、nder the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark,
10、Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Commit
11、tee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENEL
12、EC Members. Ref. No. EN 50289-4-17:2015 E BS EN 50289-4-17:2015EN 50289-4-17:2015 2 Contents Page European foreword . 3 Introduction . 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Test methods . 6 4.1 Test methods for outdoor application . 6 4.2 Test methods for indoor applicat
13、ion . 9 5 Measurements 10 5.1 Loss in mechanical properties . 10 5.2 Change in appearance 11 5.3 Change in colour . 11 6 Evaluation of results . 11 7 Test report 11 Annex A (informative) Example of UV test apparatus with mercury vapour lamp source 13 Annex B (informative) Guidelines to the interpret
14、ation and use 15 Bibliography 18 Figures Figure A.1 Vapour mercury test apparatus 13 Figure A.2 Vapour mercury test apparatus Details of construction . 14 Tables Table B.1 Excerpt from MICE table . 16 Table B.2 Measurement units and conversion a16 BS EN 50289-4-17:2015EN 50289-4-17:2015 3 European f
15、oreword This document (EN 50289-4-17:2015) has been prepared by CLC/TC 46X “Communication cables”. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-08-31 latest date
16、 by which the national standards conflicting with this document have to be withdrawn (dow) 2018-08-31 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such
17、 patent rights. This document supersedes EN 50289-4-17:2011. EN 50289-4-17:2015 includes the following significant technical changes with respect to EN 50289-4-17:2011: Annex A has been downgraded as “informative”. Annexes B and C have been deleted and a new Annex B has been introduced that is no lo
18、nger requirements but only a guideline to the interpretation and use. BS EN 50289-4-17:2015EN 50289-4-17:2015 4 Introduction UV hazard assessment for synthetic compounds is possible using a number of UV sources. For the purposes of this European Standard, three alternative methods are given. 1) Meth
19、od A uses a xenon arc source to simulate the UV effect on cable sheath. The effect is measured by the variation of mechanical characteristics and/or change in colour after exposure. 2) Method B uses a fluorescent lamp to simulate the UV effect on cable sheath. Two different lamps may be used; type I
20、 (called UV-A lamps) and type II (called UV-B lamps). The effect is measured as for method A, by the variation of mechanical characteristics and/or change in colour after exposure. 3) Method C uses mercury vapour lamp to simulate the UV effect on cable sheath. As for methods A and B, the effect is d
21、etermined by the variation of mechanical characteristics and/or change in colour after exposure. This test has been typically used for telecommunication cables. For outdoor cable application only, the test specimens are periodically subjected to water attack, for methods A and B. A recent modificati
22、on of method C now allows for a water immersion cycle. For method C, the round robin tests made without water (see Annex B) indicate the method may be applicable to outdoor environments. Other sources and determination methods are capable of detecting and analysing the UV hazard for a cable sheath.
23、Examples of such methods are metal halide lamps or sunshine carbon arc lamps, in combination with proper filters in order to cut off most radiation having wavelengths lower than 290 nm. Contracting parties may agree to use such other methods, but such methods cannot claim conformity to this European
24、 Standard. If used, it is recommended that such methods have at least equivalent sensitivity and detection levels as those in this European Standard. Informative Annex B gives guidelines for the use and interpretation of results. NOTE It is important to recall the introduction to EN ISO 4892-1:2000,
25、 which says, “The relative durability of materials in actual-use exposures can be very different depending on the location of the exposure because of differences in UV radiation, time of wetness, temperature, pollutants and other factors. Therefore, even if results from a specific accelerated labora
26、tory test are found to be useful for comparing the relative durability of materials exposed in a particular outdoor location or in particular actual-use conditions, it cannot be assumed that they will be useful for determining the relative durability of materials exposed in a different outdoor locat
27、ion or in different actual-use conditions.” BS EN 50289-4-17:2015EN 50289-4-17:2015 5 1 Scope This European Standard describes three methods to determine the UV resistance of sheath materials for electric and for optical fibre cables. These tests apply for outdoor and indoor cable applications accor
28、ding to the product standard. The samples of sheath are taken from the finished cables. Although this test method European Standard is written principally for communication cables, it may be used for energy cables if called up by the relevant product standard. Where a sheath is of cross-linked (ther
29、mosetting) material, it should be recalled that the preparation of moulded plaques should be made before crosslinking. Methods differ by the nature of the UV source. Due to the excessive time to failure, the methods described are inappropriate to products where UV resistance is conferred by 2,0 % ca
30、rbon black meeting the dispersion requirements defined in EN 50290-2-24. 2 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 refer
31、ences, the latest edition of the referenced document (including any amendments) applies. EN 16472:2014, Plastics Method for artificial accelerated photoageing using medium pressure mercury vapour lamps EN 60811-202, Electric and optical fibre cables Test methods for non-metallic materials Part 202:
32、General tests - Measurement of thickness of non-metallic sheath (IEC 60811-202) EN 60811-501, Electric and optical fibre cables Test methods for non-metallic materials Part 501: Mechanical tests Tests for determining the mechanical properties of insulating and sheathing compounds (IEC 60811-501) EN
33、ISO 4892-1:2000, Plastics Methods of exposure to laboratory light sources Part 1: General guidance (ISO 4892-1:1999) EN ISO 4892-2:2013, Plastics Methods of exposure to laboratory light sources Part 2: Xenon-arc lamps (ISO 4892-2:2013) ISO 9370, Plastics Instrumental determination of radiant exposur
34、e in weathering tests General guidance and basic test method 3 Terms and definitions For the purposes of this document, the following term and definition applies. 3.1 median value when several test results have been obtained and ordered in an increasing (or decreasing) succession, middle value if th
35、e number of available value is odd, and mean of the two middle values if the number is even SOURCE: EN 60811-100:2012, 3.1) BS EN 50289-4-17:2015EN 50289-4-17:2015 6 4 Test methods 4.1 Test methods for outdoor application 4.1.1 Method A: xenon arc source 4.1.1.1 General According to EN ISO 4892-1:20
36、00, 5.1.6.1, the xenon arc lamp, when appropriately filtered, produces radiations with a spectral power distribution that is a good simulation of average daylight throughout the UV and visible region. The exposure apparatus is typically constituted by a rotating specimen holder drum, which rotates a
37、round the light source, as per EN ISO 4892-1:2000, Figure B.1. Apparatus having a fixed specimen holder is also permitted. In this case, it is important that air can circulate around the sample to allow a homogeneous repartition of temperature. 4.1.1.2 Apparatus The testing apparatus is equipped wit
38、h the following lamps and filters and is set with the parameters prescribed below: a ray source consisting of a xenon arc lamp (“long arc” type) equipped with borosilicate filters so that the typical irradiance should be 43 W/m2 15 % with a spectrum between 300 nm and 400 nm; a means to provide auto
39、matic control of temperature, humidity and cycles; a generator of deionised water with a conductivity not greater than 5 S/cm (the pH should be recorded); the water shall leave no observable stains or deposits and should therefore contain less than 1 ppm of solids; the rate of flow should be suffici
40、ent to guarantee that all the test specimens can be washed; a means to control the irradiance to produce (43,0 0,2) W/m2at 340 nm (if the apparatus is not equipped with irradiance control, follow the device manufacturers recommendations to produce this irradiance). More details are given in EN ISO 4
41、892-2:2013. 4.1.1.3 Sample and test specimen preparation A sample, at least 600 mm long, of the finished cable or of the outer sheath removed from the finished cable. It shall be used to prepare 12 test specimens. Test specimens shall be prepared according to EN 60811-202. In case, for geometrical r
42、easons, it is not possible to use the above samples (finished cable or outer sheath), test specimens shall be cut from finished cable, a moulded plaque prepared from pieces of the cable sheath or a moulded plaque produced from granules of the same material and colour of the cable sheath. The thickne
43、ss of the test pieces shall be (1,0 0,1) mm. 4.1.1.4 Procedure Six test specimens shall be suspended vertically so that the external surface is uniformly exposed to the action of the actinic rays. During the test, the temperature indicated by the black-panel or the black-standard thermometer shall r
44、emain in the range (60 3) C and the relative humidity shall remain in the range (50 5) % (only in the dry period in the case of a test for outdoor application). The rotating drum carrying the test specimens shall turn at a speed of (1 0,1) r/min. If a flat specimen plane is used, the minimum irradia
45、nce in any point of the specimen exposure area shall be at least 90 % of maximum irradiance. BS EN 50289-4-17:2015EN 50289-4-17:2015 7 Test specimens are cycled through periods of UV exposure, followed by periods of no radiation during which temperature changes occur. The periods of each cycle, tota
46、l time of 120 min, are the following: 102 min of dry UV exposure at a temperature of (60 3) C 1), followed by 18 min of deionised water exposure, without radiation, at a temperature of (50 5) C. The overall duration of the test shall be as defined in the relevant product standard. In the absence of
47、such a definition, guidance is given in Annex B. After the exposure, the exposed test specimens shall be removed from the equipment and conditioned at ambient temperature for at least 16 h. The six other test specimens shall be kept at ambient temperature and protected from any light source during t
48、he UV treatment; they shall be tested at the same time as the exposed test specimens. 4.1.2 Method B: fluorescent UV lamp 4.1.2.1 General According to EN ISO 4892-3:2013, 4.1.1, there are different types of fluorescent UV lamps that may be used as laboratory light sources: type I lamps (commonly cal
49、led UV-A lamps), with the preferred option of the UV-A 340 lamp, having a spectral radiation that peaks at 340 nm; type II lamps (commonly called UV-B lamps), having a spectral radiation that peaks near the 313 nm mercury line; these type II fluorescent UV lamps emit significant amount of radiation below 300 nm, the nominal cut off wavelength for solar radiation, which may result in ageing processes not completely equal to those occurring outdoors. The method using UV-B lamp
