BS EN 61482-1-2-2007 Live working - Protective clothing against the thermal hazards of an electric arc - Test methods - Determination of arc protection class of material and clothit.pdf

1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58hazards of an electric arc Part 1-2: Test methods Method 2: Determination of arc protection class o

2、f material and clothing by using a constrained and directed arc (box test)The European Standard EN 61482-1-2:2007 has the status of a British StandardICS 13.220.40Live working Protective clothing against the thermal BRITISH STANDARDBS EN 61482-1-2:2007BS EN 61482-1-2:2007This British Standard was pu

3、blished under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 57061 2Thermal Performance Value (ATPV) of the material.It is the opinion of UK technical committee PEL/78 that the “box test” does not provide the user with a realistic and reliable tes

4、t. A premise of this test is that the fault currents will not exceed 4000 A or 7000 A and the worker will not be closer than the specified distance from the arc (in reality this cannot be guaranteed). The energy on the workers body is directly proportional to the length of the arc, the current and t

5、he duration of the arc. For example, if a worker is positioned at 60 cm from the arc and is exposed to 4 cal/cm2, at 30 cm from the arc the energy will be approximately 16 cal/cm2. Experience in the field has shown that hazards can range in strength starting from 3 or 4 cal/cm2to levels higher than

6、40 cal/cm2.UK technical committee PEL/78 believes that IEC 61482-1-1 will provide the best way to determine whether a particular material will provide the best protection for the worker for any given job.This publication does not purport to include all the necessary provisions of a contract. Users a

7、re responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsUK technical committee PEL/78 has consistently opposed the need for this document in view of the existence of the prima

8、ry document IEC 61482-1 (implemented in the UK as DD CLC/TS 61482-1:2003). However, under CENELEC rules, the UK is obliged to publish it at a national level.The “box test” referred to in IEC 61482-1-2 (implemented here as BS EN 61482-1-2:2007) evaluates flame-retardant material at two levels of curr

9、ent, 4 kA and 7 kA. In contrast, IEC 61482-1, soon to be revised and published as IEC 61482-1-1, provides a method for determining the Arc National forewordThis British Standard is the UK implementation of EN 61482-1-2:2007. It is identical to IEC 61482-1-2:2007. It supersedes DD ENV 50354:2001 whic

10、h is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/78, Tools for live working.A list of organizations represented on this committee can be obtained on request to its secretary.EUROPEAN STANDARD EN 61482-1-2 NORME EUROPENNE EUROPISCHE NORM March 2007 CENEL

11、EC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved world

12、wide for CENELEC members. Ref. No. EN 61482-1-2:2007 E ICS 13.220.40; 29.260; 29.260.99 Supersedes CLC/TS 50354:2003English version Live working - Protective clothing against the thermal hazards of an electric arc - Part 1-2: Test methods - Method 2: Determination of arc protection class of material

13、 and clothing by using a constrained and directed arc (box test) (IEC 61482-1-2:2007) Travaux sous tension - Vtements de protection contre les dangers thermiques dun arc lectrique - Partie 1-2: Mthodes dessai - Mthode 2: Dtermination de la classe de protection contre larc de matriaux et de vtements

14、au moyen dun arc dirig et contraint (enceinte dessai) (CEI 61482-1-2:2007) Arbeiten unter Spannung - Schutzkleidung gegen die thermischen Gefahren eines elektrischen Lichtbogens -Teil 1-2: Prfverfahren - Verfahren 2: Bestimmung der Lichtbogen-Schutzklasse des Materials und der Kleidung unter Verwend

15、ung eines gerichteten Prflichtbogens (Box-Test) (IEC 61482-1-2:2007) This European Standard was approved by CENELEC on 2007-03-01. 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 s

16、tandard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any

17、other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Re

18、public, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61482-1-2:2007 2 Foreword The text of docu

19、ment 78/657/CDV, future edition 1 of IEC 61482-1-2, prepared by IEC TC 78, Live working, was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as EN 61482-1-2 on 2007-03-01. This European Standard supersedes CLC/TS 50354:2003. The following dates were fixe

20、d: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-03-01 Annex ZA has been added by CENELEC. _ E

21、ndorsement notice The text of the International Standard IEC 61482-1-2:2007 was approved by CENELEC as a European Standard without any modification. _ 3 EN 61482-1-2:2007 CONTENTS 1 Scope 5 2 Normative references .6 3 Terms, definitions and symbols.6 4 Principle of the test methods.11 4.1 Material b

22、ox test method11 4.2 Garment box test method.11 5 Significance and use of the test methods 11 6 Test apparatus .12 6.1 Test box for both methods .12 6.2 Material box test method14 6.3 Garment box test method.16 6.4 Electric supply and electrodes16 6.5 Electric arc characteristics .17 6.6 Measurement

23、 and data acquisition system .17 7 Precautions 18 8 Specimen preparation.18 8.1 Description of the test specimens.18 8.2 Laundry conditioning of test specimens.19 8.3 Pre-conditioning of the test specimens .19 9 Calibration19 9.1 Data acquisition system pre-calibration 19 9.2 Calorimeter calibration

24、 check.19 9.3 Arc exposure calibration 19 9.4 Calibration of the electric test circuit and testing.20 9.5 Confirmation of test apparatus setting 20 9.6 Preparing and conditioning of the box 20 10 Apparatus care and maintenance21 10.1 Surface reconditioning of the sensors.21 10.2 Care of test plate a

25、nd mannequin.21 10.3 Care of electrodes .21 11 Test procedures .21 11.1 Test parameters 21 11.2 Number of tests .22 11.3 Test conditions and initial temperature .22 11.4 Specimen mounting .22 11.5 Specimen description 22 12 Interpretation of results.23 12.1 Heat transfer .23 12.2 Visual inspection .

26、24 12.3 Test result .25 13 Test report .25 Annex ZA (normative) Normative references to international publications with their corresponding European publications28 EN 61482-1-2:2007 4 Bibliography .27 Figure 1 Test box 13 Figure 2 Test set up 14 Figure 3 Test plate with sensors (calorimeter in mount

27、ing board) .15 Table 1 Statistically confirmed mean values of the direct exposure incident energy .20 Table 2 Ranges of the permissible arc energy 20 Table 3 Test parameters for Classes 1 and 221 Table 4 Human tissue tolerance to heat, second degree burn .24 Table 5 Acceptance criteria for tests on

28、materials.25 Table 6 Acceptance criteria for tests on garments.25 5 EN 61482-1-2:2007 LIVE WORKING PROTECTIVE CLOTHING AGAINST THE THERMAL HAZARDS OF AN ELECTRIC ARC Part 1-2: Test methods Method 2: Determination of arc protection class of material and clothing by using a constrained and directed ar

29、c (box test) 1 Scope This part of IEC 61482 specifies methods to test material and garments intended for use in heat- and flame-resistant clothing for workers exposed to electric arcs. In contrast to the test methods in IEC 61482-1-11)a directed and constrained electric arc in a low voltage circuit

30、is used to classify material and clothing in defined arc protection classes. The test methods specified in this document are aimed at rendering a decision whether arc thermal protection is met under defined conditions. Two protection classes are tested. Protection class 1 and protection class 2 are

31、safety requirements covering actual risk potentials due to electric fault arcs. NOTE 1 In practice there can be higher risks. A risk analysis should clarify the actual risk. The test methods are not directed toward measuring the arc thermal performance value (ATPV). Methods determining the ATPV are

32、prescribed in IEC 61482-1-1. This standard specifies tests with which it is possible to evaluate materials and protective clothing based on the use of a directed and constrained electric arc under defined laboratory conditions (box-test). A practical scenario concerning test set-up and test conditio

33、ns, electrical and constructional parameters is selected. For the tests a low voltage procedure is used. The tests can optionally be carried out in two fixed test classes, selected by the amount of prospective short circuit current: Class 1 4 kA; Class 2 7 kA. The defined duration of the electric ar

34、c is 500 ms in both test classes. NOTE 2 These conditions represent e.g. low voltage environmental conditions during an electric fault. Materials and clothing will be tested with two methods: the material box test method and the garment box test method. _ 1)IEC 61482-1, Ed.1 (2002) is currently unde

35、r revision. The next edition will be numbered IEC 61482-1-1. EN 61482-1-2:2007 6 The material box test method is used to measure and find material response to an arc exposure when tested in a flat configuration. A quantitative measurement of the arc thermal performance is made by means of the energy

36、 transmitted through the material. The garment box test method is used to test the function of the protective clothing after an arc exposure, including all the garment findings, sewing tread, fastenings and other accessories; no heat flux will be measured. Testing refers to the thermal arc effects;

37、it does not apply to other effects like noise, light emissions, pressure rise, hot oil, electric shock, the consequences of physical and mental shock or toxic influences. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer

38、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60584-1, Thermocouples Part 1: Reference tables ISO 3175-2, Textiles Professional care, drycleaning and wetcleaning of fabrics and garments Part 2: Pro

39、cedure for testing performance when cleaning and finishing using tetrachloroethene ISO 6330, Textiles Domestic washing and drying procedures for textile testing ISO 9151, Protective clothing against heat and flame Determination of heat transmission on exposure to flame 3 Terms, definitions and symbo

40、ls For the purposes of this document, the following terms, definitions and symbols apply. 3.1 arc current Iarc current actually flowing in the electric test circuit during arc duration (through the arc); as r.m.s. value the average during arc duration NOTE 1 Arc current is expressed in A. NOTE 2 The

41、 arc current flowing during arc duration fluctuates due to the non-linear arc impedance stochastically varying with time. 3.2 arc duration time duration of the arc NOTE Arc duration is expressed in s. 7 EN 61482-1-2:2007 3.3 arc energy Warc electrical energy supplied to the arc and converted in the

42、arc; sum of the instantaneous arc voltage values multiplied by the instantaneous arc current values multiplied by the incremental time values during the arc duration NOTE Arc energy is expressed in kJ or kWs. 3.4 arc gap distance between the arc electrodes NOTE Arc gap is expressed in mm. 3.5 arc th

43、ermal protection degree of thermal protection offered against electric arc under specific arc testing conditions NOTE 1 For materials, the arc thermal performance is obtained from the measurement of the transmitted energy and by evaluation of other thermal parameters (burning time, hole formation, m

44、elting). NOTE 2 For garments, the arc thermal performance is obtained by evaluation of thermal parameters (burning time, hole formation, melting) and of the functioning of fasteners and accessories. 3.6 arc voltage voltage across the arc NOTE Arc voltage is expressed in V. 3.7 burning time time for

45、which a flame is visible after arc exposition NOTE Burning time is expressed in s. 3.8 calorimeter device for measuring the heat flux and incident energy 3.9 charring formation of carbonaceous residue as the result of pyrolysis or incomplete combustion 3.10 clothing assembly of garments worn by work

46、ers 3.11 delta peak temperature Tp difference between the maximum temperature and the initial temperature of the sensor during the test exposure time NOTE 1 Delta peak temperature is expressed in C. NOTE 2 The symbol Tpis used without index when testing with material; an additional index “0” is used

47、 when testing without material for calibration (Tp0). EN 61482-1-2:2007 8 3.12 direct exposure incident energy Ei0heat energy or incident energy emitted by the electric arc and received at a calorimeter directly exposed to the arc without material influence; used for calibration NOTE Direct exposure

48、 incident energy is expressed in kJ/m2or kWs/m2(cal/cm) 2). 3.13 dripping material response evidenced by flowing of the fibre polymer 3.14 electric arc self-maintained gas conduction for which most of the charge carriers are electrons supplied by primary-electron emission IEV 121-13-12 NOTE During l

49、ive working, the electric arc is generated by gas ionisation arising from an unintentional electrical conducting connection or breakdown between live parts or a live part and the earth path of an electrical installation or an electrical device. During testing, the electric arc is initiated by the blowing of a fuse wire. 3.15 embrittlement formation of a brittle residue as the result of pyrolysis or incomplete combustion 3.16