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1、BRITISH STANDARD BS EN 60695-5-1:1993 Fire hazard testing Part 5: Assessment of potential corrosion damage by fire effluent Section 1: General guidance The European Standard EN 60695-5-1:1993 has the status of a British Standard UDC 621.3-1:620.19:614.84 Licensed Copy: sheffieldun sheffieldun, na, T
2、hu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60695-5-1:1993 This British Standard, having been prepared under the direction of the General Electrotechnical Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 November
3、 1993 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference GEL/89 Draft for comment 92/22518 DC ISBN 0 580 22362 0 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Stand
4、ard was prepared, comprises the national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publication Amd. No.DateComments Licensed Copy: sh
5、effieldun sheffieldun, na, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60695-5-1:1993 BSI 11-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 60695-5-13 National annex NA (informative) Committees responsibleInside back
6、cover National annex NB (informative) Cross-referenceInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60695-5-1:1993 ii BSI 11-1999 National foreword This British Standard has been prepared under the direction of the G
7、eneral Electrotechnical Standards Policy Committee and is the English language version of EN 60695-5-1:1993 Fire hazard testing Part 5: Assessment of potential corrosion damage by fire effluent Section 1: General guidance, published by the European Committee for Electrotechnical Standardization (CEN
8、ELEC). It is identical with IEC 695-5-1:1993 published by the International Electrotechnical Commission (IEC). The foreword of EN 60695-5-1 makes reference to the “date of withdrawal” (dow) of the relevant national standard. In this case, there is no relevant British Standard. A British Standard doe
9、s not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an insi
10、de front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sh
11、effieldun, na, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60695-5-1 July 1993 UDC 621.3-1:620.19:614.84 Descriptors: Fire hazard testing, fire effluent, corrosion, risk of damage, electrotechnical equipment, structure English v
12、ersion Fire hazard testing Part 5: Assessment of potential corrosion damage by fire effluent Section 1: General guidance (IEC 695-5-1:1993) Essais relatifs aux risques du feu Partie 5: Evaluation des dommages potentiels de corrosion provoqus par les effluents du feu Section 1: Guide gnral (CEI 695-5
13、-1:1993) Prfungen zur beurteilung der Brandgefahr Teil 5: Beurteilung der Gefahr der Beschdigung durch Korrosion infolge von Brandgasen Hauptabschnitt 1: Allgemeine Anleitung (IEC 695-5-1:1993) This European Standard was approved by CENELEC on 1993-03-09. CENELEC members are bound to comply with the
14、 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 Central Secretariat or
15、 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 Central Secretariat has the same status as the offici
16、al versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical
17、 Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 60695-5-1:1993 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01
18、:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60695-5-1:1993 2 BSI 11-1999 Foreword The text of document 89(CO)19, as prepared by IEC Technical Committee 89, Fire hazard testing, was submitted to the IEC-CENELEC parallel vote in November 1991. The reference document was approved by CENELEC as
19、 EN 60695-5-1 on 9 March 1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex B are informative and Annex ZA is normative. Contents Page Foreword
20、2 Introduction3 1Scope3 2Normative references3 3Definitions3 4Fire scenarios4 5Essential considerations in test method design and selection4 6Category of test methods4 Annex A (informative) Protection of electrotechnical equipment6 Annex B (informative) Bibliography6 Annex ZA (normative) Other inter
21、national publications quoted in this standard with the references of the relevant European publications6 latest date of publication of an identical national standard(dop) 1994-06-01 latest date of withdrawal of conflicting national standards(dow) 1994-06-01 Licensed Copy: sheffieldun sheffieldun, na
22、, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60695-5-1:1993 BSI 11-19993 Introduction The risk of fire should be considered in any electrical circuit. With regard to this risk the objectives of components, circuit and equipment design and the choice of materials should be to r
23、educe the likelihood of fire even in the event of foreseeable abnormal use, malfunction or failure. The practical aim should be to prevent ignition due to the electrically energized part but, if ignition and fire occur, to control the fire preferably within the bounds of the enclosure of the electro
24、technical product. All fire effluent is corrosive to some degree and the level of potential to corrode depends on the substrate under attack as well as the combination of combustible materials involved in fire. There is no evidence that fire effluent from electrotechnical products offers greater ris
25、k of corrosion damage than other products such as furnishings, building materials, etc. The performance of electrical and electronic components can be adversely affected by corrosion when subjected to fire effluent. A wide variety of combinations of small quantities of effluent gases, smoke particle
26、s, moisture and temperature may provide conditions for electrical component or system failures from breakage, overheating or shorting. Evaluation of potential corrosion damage is particularly important for high value and safety-related electrotechnical products and installations. Technical committee
27、s which are responsible for the products will choose the test(s) and they will specify the level of severity. Considering corrosion requires an interdisciplinary approach involving chemistry, electricity, physics, mechanical engineering, metallurgy and electrochemistry. In the preparation of this se
28、ction of IEC 695-5, all of the above have been considered. This section of IEC 695-5 defines the scope of the guidance and indicates the field of application. Section 2 of IEC 695-5 will give a state of the art of test methods including relevance and usefulness. Section 3 of IEC 695-5 will give deta
29、ils of test methods (if not defined in another International Standard). 1 Scope This section of IEC 695-5 is intended to give guidance on the assessment of corrosion damage: a) to electrotechnical equipment and systems from fire effluent; b) to building structures from fire effluent emitted by elect
30、rotechnical equipment and systems. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC 695-5. At the time of publication, the editions indicated were valid. All normative documents are subject
31、 to revision, and parties to agreements based on this section of IEC 695-5 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 695-1-1:
32、1982, Fire hazard testing Part 1: Guidance for the preparation of requirements and test specifications for assessing fire hazard of electrotechnical products General guidance. IEC 695-4:1989, Fire hazard testing Part 4: Terminology concerning fire tests. 3 Definitions For the purpose of this Interna
33、tional Standard, the following definitions apply. 3.1 Definitions taken from IEC 695-4 The figures given in parentheses, after the defined term, refer to the subclauses of IEC 695-4. fire (2.26):a) A process of combustion characterized by the emission of heat accompanied by smoke, and/or flame, and/
34、or glowing. b) Combustion spreading uncontrolled in time and space. fire effluent (2.29): The total gaseous, particulate or aerosol effluent from combustion or pyrolysis. ignition source (2.62): An (external) heat source that initiates combustion. smoke (2.83):A visible suspension of solid and/or li
35、quid particles in gases resulting from combustion or pyrolysis. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60695-5-1:1993 4 BSI 11-1999 3.2 Further terms and definitions1) corrosion damage the physical and/or chemical damage or impai
36、red function caused by the chemical action of fire effluent corrosion target the sensor product, component, or a reference material simulating them used to determine the degree of corrosion damage, under specified test conditions fire effluent transport the movement of fire effluent away from the lo
37、cation of the fire fire effluent decay characteristics the physical and/or chemical changes in fire effluent due to time and transport fire scenario a detailed description of conditions, including environmental, of one or more of the stages from before ignition to the completion of combustion in an
38、actual fire at a specific location, or in a full-scale simulation 4 Fire scenarios Within the context of this section, the fire scenarios shall be examined for relevance to the corrosion damage caused by fire effluent in the following situations: a) within electrotechnical equipment and systems from
39、 unusual localized, internal sources of excessive heat and ignition; b) from electrotechnical equipment and systems when exposed to external sources of flame or excessive heat. 5 Essential considerations in test method design and selection When evaluating the relevance of a test method, the followin
40、g should be considered. 5.1 Corrosion targets Corrosion targets are those electrotechnical products or building components whose performance could be significantly and adversely affected by exposure to fire effluent. Examples are: a piece of metal or concrete, a printed wiring board, a complete equi
41、pment such as a telephone handset. Corrosion targets shall be placed in the effluent inside the test apparatus to detect the degree of corrosion damage. 5.2 Generation of fire effluent The fire effluent in 6.1, 6.2 and 6.3 shall be generated according to a relevant procedure as defined by IEC or ISO
42、 (fire models). Reference to a discussion of fire models is given in Annex B. 5.3 Relevant fire effluent characteristics The significant effects of fire effluent are related to their actions on the targets in terms of rate of function impairment and are thus dependent on: the chemical and physical n
43、ature and concentration of the fire effluent; the chemical and physical nature of the exposed targets; the prevailing conditions of temperature and relative humidity; whether or not an electrical circuit is present and energized; interactions among fire effluent species themselves (smoke particulate
44、 ageing and agglomeration, settling, precipitation phenomena, absorption by smoke particles of chemically reactive effluents); interactions between fire effluent and surrounding surfaces (for example, structural elements). 6 Category of test methods It is desirable that the test procedure is designe
45、d in such a manner that the results are valid for application to an analysis of corrosion hazard, and also as part of an analysis of total fire hazard. Work on the design of reaction-to-fire tests to ensure that results are valid in assessment of hazard is in its early stages (see IEC 695-1-1 for ea
46、rly guidance). The guidance in this section will therefore be superseded as work progresses. There are three approaches to testing and they are defined in terms of the type of corrosion target. 6.1 Approach 1: product testing The corrosion target shall be a manufactured product. Examples are: printe
47、d wiring board, switchboards, washing machines, computers, etc. The effects of fire effluent on the product can be assessed by degradation of function as determined by inspection or measurement. 1) These definitions are taken from IEC/DIS 89(CO)25. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov
48、 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60695-5-1:1993 BSI 11-19995 6.2 Approach 2: simulated product testing The corrosion target shall be a reference material simulating a product. The effects of fire effluent on the reference material can be assessed by measurements such as cha
49、nge in aspect, weight, mechanical, physical or electrical characteristics. 6.3 Approach 3: indirect assessment An indirect method of assessment is one that uses no corrosion target but measures a characteristic of the gases and vapours evolved, for example the pH and/or the conductivity of a solution in which the gases and vapours evolved by combustion have been dissolved. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:40:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60695-5-1:1993 6 BSI 11-1999 Annex A (informative)