1、BSI Standards PublicationBS EN 50577:2015Electric cables Fire resistancetest for unprotected electriccables (P classification)BS EN 50577:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50577:2015.The UK participation in its preparation was entrusted to Tec
2、hnicalCommittee GEL/20/18, Electric Cables - Fire testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Bri
3、tish Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 78382 1ICS 13.220.50; 29.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee o
4、n 31 December 2015.Amendments issued since publicationDate Text affectedBS EN 50577:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50577 December 2015 ICS 13.220.50; 29.060.20 English Version Electric cables - Fire resistance test for unprotected electric cables (P classification) Cbles le
5、ctriques - Essai de rsistance au feu des cbles lectriques non protgs (Classification P) Kabel und Leitungen - Feuerwiderstandsprfung an ungeschtzten Kabeln und Leitungen (P-Klassifikation) This European Standard was approved by CENELEC on 2015-11-02. CENELEC members are bound to comply with the CEN/
6、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 Centr
7、e 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 under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status
8、 as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
9、Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normu
10、ng 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 CENELEC Members. Ref. No. EN 50577:2015 EBS EN 50577:2015EN 50577:2015 (E) 2 Contents European foreword . 4 Introduction . 5 1 Scope 6 2 Nor
11、mative references . 6 3 Terms and definitions 7 4 Test equipment . 7 4.1 Test furnace . 7 4.2 Continuity and voltage withstand checking arrangement . 7 4.3 Fuse . 8 4.4 Standardized representative installation . 8 4.5 Installation of standardized representative installation 11 5 Test conditions . 16
12、 5.1 Environmental conditions . 16 5.2 Furnace control . 16 6 Test specimen. 16 6.1 Length of test specimen 16 6.2 Number of test specimens 17 6.3 Conditioning 17 6.4 Specimen preparation . 17 6.5 Mounting of test specimens 17 7 Test procedure . 18 7.1 General 18 7.2 Measuring temperature . 18 7.3 A
13、pplying the voltage . 20 7.4 Starting the test . 21 8 Duration of survival 21 8.1 Point of failure . 21 9 Test report 22 Annex A (normative) Field of direct application 23 A.1 Definitions . 23 A.2 Cable Management System . 23 A.3 Orientation . 23 A.4 Bending radius 23 Annex B (normative) Extended ap
14、plication of test results . 24 B.1 Definitions . 24 B.2 Product families for EXAP 24 B.3 EXAP procedure 25 Bibliography 27 BS EN 50577:2015EN 50577:2015 (E) 3 Figures Figure 1 Plan view of “U” bend arrangement incorporating straight or curved corners in both horizontal and vertical furnaces 10 Figur
15、e 2 End elevation of “U” bend arrangement in both horizontal and vertical furnaces 10 Figure 3 Plan view of “S” bend arrangement in horizontal furnace only . 11 Figure 4 End elevation of “S” bend arrangement in horizontal furnace only 11 Figure 5 Plan view of “U” bend standardized installation with
16、curved or straight corners 12 Figure 6 End elevation of “U” bend standardized installation . 12 Figure 7 Plan view of “S” bend standardized representative installation with curved and straight corners . 13 Figure 8 End elevation of “S” bend standardized representative installation . 14 Figure 9 Exit
17、 in the furnace wall of the “U” bend installation . 15 Figure 10 Exit in the furnace wall of the “S” bend installation. 16 Figure 11 Arrangement of test specimens in “U” bend installation . 17 Figure 12 Arrangement of a test specimen in “S” bend installation 18 Figure 13 Locations of plate thermomet
18、ers in “U” bend installation . 19 Figure 14 Locations of plate thermometers in “S” bend installation . 19 Figure 15 Basic circuit diagram Electric power and control cables with rated voltage up to and including 600/1 000V . 21 BS EN 50577:2015EN 50577:2015 (E) 4 European foreword This document (EN 5
19、0577:2015) has been prepared by CLC/TC 20 “Electric 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) 2016-11-02 latest date by which the national standards confl
20、icting with this document have to be withdrawn (dow) 2018-11-02 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 patent rights. This document has been
21、 prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association. The cables are tested in a standardized representative installation, under conditions of minimum bending radius and subject to exposure to fire under conditions of the EN 1363-1 standard ti
22、me/temperature curve which satisfies the requirements of Mandate M/117 for the P classification. NOTE The test method in EN 50200 includes exposure to fire under specified conditions of constant temperature attack and satisfies the requirements of Mandate M/117 for the PH classification. BS EN 50577
23、:2015EN 50577:2015 (E) 5 Introduction The purpose of this test is to evaluate the ability of an electric cable to maintain electrical circuit integrity during a defined time whilst exposed to fire under conditions of the EN 1363-1 standard time/temperature curve and when installed in a standardized
24、representative condition. The fire exposure conditions and general arrangement in this European Standard are similar to those given in prEN 1366-11 1, developed by CEN/TC 127, and a future document on Cable management systems (CMS) for fire resistant installations, to be developed by CLC/TC 213 2. E
25、ach of these standards has been developed under a Mode 4 co-operation between CEN/TC 127, CLC/TC 213 and CLC/TC 20. The test installation has been designed such that vertical and horizontal furnaces can be used to carry out the test. The standardized representative condition can be arranged in the f
26、ollowing configurations: a) a “U” or “S” in the horizontal furnace; b) a “U” and “S” in the horizontal furnace and c) a “U” in the vertical furnace. Caution The attention of all persons concerned with managing and carrying out this fire resistance test is drawn to the fact that fire testing may be h
27、azardous and that there is a possibility that toxic and/or harmful smoke and gases may be evolved during the test. Mechanical, electrical and operational hazards may also arise during the construction of the test elements or structures, their testing and the disposal of test residues. An assessment
28、of all potential hazards and risks to health should be made and safety precautions should be identified and provided. Written safety instructions should be issued. Appropriate training should be given to relevant personnel. Laboratory personnel should ensure that they follow written safety instructi
29、ons at all times. BS EN 50577:2015EN 50577:2015 (E) 6 1 Scope This European Standard specifies a test method to evaluate the maintenance of circuit integrity of electric cables which have intrinsic resistance to fire under fire conditions, in order to classify the electric cable according to EN 1350
30、1-3. The test determines the survival time for circuit integrity of the electric cable when exposed to fire under the conditions of the EN 1363-1 standard time/temperature curve. This European Standard is used in conjunction with EN 1363-1. This European Standard applies to electric power and contro
31、l cables with rated voltage up to and including 600/1 000 V. The cable is tested in a standardized representative installation condition. The test does not assess the performance of the cable management system. NOTE Optical fibre cables and copper communication cables could be tested using this test
32、 method, however verification procedures for such cables were still under development when this document has been circulated for vote (2015-07-24). This European Standard includes field of direct application (Annex A) and rules for extended application of test results (EXAP) (Annex B). The selection
33、 of cables to be tested for classification of a family is given in Annex B. In case the selection of the cables does not comply with Annex B, the test results are only applicable to the tested cables. 2 Normative references The following documents, in whole or in part, are normatively referenced in
34、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 1363-1, Fire resistance tests Part 1: General requirements EN 13501-3, Fire clas
35、sification of construction products and building elements Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: fire resisting ducts and fire dampers1)EN 50200, Method of test for resistance to fire of unprotected small cables f
36、or use in emergency circuits EN 61537, Cable management Cable tray systems and cable ladder systems (IEC 61537) EN ISO 13943, Fire safety Vocabulary (ISO 13943) 1)EN 13501-3 will be amended to include cables BS EN 50577:2015EN 50577:2015 (E) 7 IEC 60269-3, Low voltage fuses Part 3: Supplementary req
37、uirements for fuses for use by unskilled persons (fuses mainly for household or similar applications) Examples of standardized systems of fuses A to F 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1363-1 and EN ISO 13943 and the following apply. 3.1
38、 circuit integrity ability of an electric cable to continue to operate in a designated manner whilst subjected to a specific source of heat for a specified period of time under specified conditions 3.2 standardized representative installation cable management system based on perforated trays and per
39、forated suspension supports 3.3 cable with intrinsic fire resistance electric cable designed to continue to operate in a designated manner whilst subjected to a specific source of heat for a specified period of time under specified conditions 3.4 rated voltage reference voltage for which the cable i
40、s designed 4 Test equipment 4.1 Test furnace The test furnace shall be capable of subjecting the electric cable when installed to the standard heating and pressure conditions specified in EN 1363-1. The internal dimensions of the test furnace shall be able to accommodate the standardized representat
41、ive installation as specified in 4.4. NOTE 1 Furnaces of the following minimum internal dimensions have been found to be suitable: 3 m long; 1,5 m deep; 2,5 m high. It is acceptable to extend the vertical furnace to achieve the above minimum internal dimensions that have been found to be suitable. N
42、OTE 2 The typical dimensions of a horizontal furnace is 4 m (length) x 3 m (width) x 2,5 m (height) and of a vertical furnace, including any necessary extensions, 3 m (length) x 1,5 m (depth) x 2,5 m (height) The centreline of burners shall be at least 500 mm away from the closest portion of the sta
43、ndardized representative installation. 4.2 Continuity and voltage withstand checking arrangement (See Figure 15) The arrangement for checking continuity and voltage withstand shall comprise a three-phase star-connected or single-phase transformer(s). BS EN 50577:2015EN 50577:2015 (E) 8 During the te
44、st a current for continuity checking shall be passed through all conductors of the test sample. This shall be provided by a three phase star connected or single phase transformer(s) of sufficient capacity to maintain the test voltage up to the maximum leakage current allowable. Consideration should
45、be taken of the fuse characteristics when determining the power rating of the transformer. The current shall be achieved by connecting one end of the sample to the transformer and the other end of the sample to a suitable load and an indicating device (e.g. lamp) to each conductor, or group of condu
46、ctors. NOTE 1 A current of approximately 0,25 A at the test voltage through each conductor or group of conductors is suitable at the beginning of the test. NOTE 2 The voltage applied during the test is the rated voltage of the cable (subject to a minimum a.c. voltage of 100 V). 4.3 Fuse Fuses used i
47、n the test procedure in 7.3 shall be 2 A Type DII complying with IEC 60269-3. Alternatively, a circuit breaker with equivalent characteristics may be used. Where a circuit breaker is used, its equivalent characteristics shall be demonstrated by reference to the characteristic curve shown in the rele
48、vant annex of EN 50200. 4.4 Standardized representative installation 4.4.1 General The cables to be tested shall be installed in the standardized representative installation described in the following subclauses. The standardized representative installation shall be assembled and installed according
49、 to the manufacturers instructions. 4.4.2 System components The system components used shall comply with EN 61537 and shall be based on the following: 4.4.2.1 Cable tray Material: galvanized steel Thickness: (1,5 0,15) mm Perforation in base: (15 5) % Width: (400 20) mm Side wall height: (60 5) mm Safe working load (SWL): 200 N/m 4.4.2.2 Suspensions and horizontal supports (U-shaped and perforated) Material: galvanized steel Cross section: (220 10) mm2Safe working load: 10 kN (Tensile S
