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1、BRITISH STANDARD BS EN 60079-14:1997 IEC 60079-14: 1996 Incorporating Corrigendum No. 1 Electrical apparatus for explosive gas atmospheres Part 14: Electrical installations in hazardous areas (other than mines) The European Standard EN 60079-14:1997 has the status of a British Standard ICS 29.260.20
2、 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60079-14:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes int
3、o effect on 15 October 1997 BSI 05-1999 ISBN 0 580 27773 9 National foreword This British Standard is the English language version of EN 60079-14:1997. It is identical with IEC 60079-14:1996. It supersedes BS 5345-1:1989 and BS 5345-3:1979, BS 5345-4:1977, BS 5345-5:1983, BS 5345-6:1978, BS 5345-7:1
4、979 and BS 5345-8:1980 which will be withdrawn on 1 December 1999. The obsolescent Standard BS 4137:1967 is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Electrical apparatus for explosive atmospheres, to Subcommittee GEL/31/11, Code of practice for
5、electrical apparatus for explosive atmospheres, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related interna
6、tional and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as
7、 IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to inter
8、national publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facil
9、ity of the BSI Standards Electronic Catalogue. A British Standard does 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 obligat
10、ions. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 31 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 i
11、nside front cover. Amendments issued since publication Amd. No.DateComments 10013 Corr No. 1 April 1998 First paragraph of the national foreword. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60079-14:1997 BSI 05-1999i Contents Page
12、National forewordInside front cover Foreword2 Text of EN 60079-145 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN S
13、TANDARD NORME EUROPENNE EUROPISCHE NORM EN 60079-14 August 1997 ICS 29.260.20 English version Electrical apparatus for explosive gas atmospheres Part 14: Electrical installations in hazardous areas (other than mines) (IEC 60079-14:1996) Matriel lectrique pour atmosphres explosives gazeuses Partie 14
14、: Installations lectriques dans les emplacements dangereux (autres que les mines) (CEI 60079-14:1996) Elektrische Betriebsmittel fr gasexplosionsgefhrdete Bereiche Teil 14: Errichtung elektrischer Anlagen in explosionsgefhrdeten Bereichen (ausgenommen Grubenbaue) (IEC 60079-14:1996) This European St
15、andard was approved by CENELEC on 1997-03-11. 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 lists and bibliographical references conce
16、rning 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 other language made by translation under the responsibility of a CENELEC member into
17、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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spai
18、n, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation
19、 in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60079-14:1997 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60079-14:1997 BSI 05-1999 2 Foreword The text of document 31J/47/FDIS, future edition 2 of I
20、EC 60079-14, prepared by SC 31J, Classification of hazardous areas and installation requirements, of IEC TC 31, Electrical apparatus for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60079-14 on 1997-03-11. The following dates were fixed: Ann
21、exes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex A and Annex ZA are normative and Annex B is informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Sta
22、ndard IEC 60079-14:1996 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 Introduction5 1Scope and object5 2Normative references5 3Definitions and terms6 4General8 4.1General requirements8 4.2Documentation8 5Selection of electrical apparatus (excluding
23、cables and conduits)8 5.1Specific information8 5.2Selection according to zones8 5.3Selection according to the ignition temperature of the gas or vapour9 5.4Selection according to apparatus grouping9 5.5External influences10 6Protection from dangerous (incendive) sparking10 6.1Danger from live parts1
24、0 6.2Danger from exposed and extraneous conductive parts10 6.3Potential equalization11 6.4Static electricity11 6.5Lightning protection11 6.6Electromagnetic radiation11 6.7Cathodically protected metallic parts11 7Electrical protection11 8Emergency switch-off and electrical isolation12 8.1Emergency sw
25、itch-off12 8.2Electrical isolation12 9Wiring systems12 9.1General12 9.2Cable systems for zone 0 13 9.3Cable systems for zones 1 and 213 9.4Conduit systems14 10Additional requirements for type of protection “d” Flameproof enclosures14 10.1 Solid obstacles14 10.2 Protection of flameproof joints14 10.3
26、 Cable entry systems15 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1998-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1999-12-01 Licensed Copy: sheffi
27、eldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60079-14:1997 BSI 05-19993 Page 10.4 Motors supplied at varying frequency and voltage16 10.5 Conduit systems16 11Additional requirements for type of protection “e” Increased safety16 11.1 Degree of protection of
28、 enclosures (IEC 34-5 and IEC 529)16 11.2 Cage induction motors Thermal protection in operation17 11.3 Wiring systems17 11.4 Resistance heating devices18 12Additional requirements for type of protection “i” Intrinsic safety18 12.1 Introduction18 12.2 Installations for zones 1 and 218 12.3 Installati
29、ons for zone 023 13Additional requirements for type of protection “p” Pressurized apparatus24 13.1 Ducting24 13.2 Action to be taken on failure of pressurization24 13.3 Multiple pressurized enclosures with a common safety device25 13.4 Purging25 14Additional requirements for apparatus for use in zon
30、e 225 14.1 Degree of protection of enclosures (IEC 34-5 and IEC 529)25 14.2 Energy-limited apparatus and circuits25 14.3 Wiring systems25 14.4 Motors supplied at varying frequency and voltage26 Annex A (normative) Verification of intrinsically safe circuits with more than one associated apparatus wi
31、th linear current/voltage characteristics27 Annex B (informative) Methods of determining the maximum system voltages and currents in intrinsically safe circuits with more than one associated apparatus with linear current/voltage characteristics27 Annex ZA (normative) Normative references to internat
32、ional publications with their corresponding European publications30 Figure 1 Selection chart for cable entry devices into flameproof enclosures for cables complying with item b) of 10.3.215 Figure 2 Earthing of conducting screens 19 Page Figure B.1 Series connection Summation of voltage 28 Figure B.
33、2 Parallel connection Summation of currents 28 Figure B.3 Series and parallel connections Summations of voltages and summations of currents 29 Table 1 Relationship between the temperature classes, surface temperatures and ignition temperature 9 Table 2 Relationship between gas/vapour subdivision and
34、 apparatus subgroup 10 Table 3 Minimum distance of obstruction from the flameproof flange related to the gas/vapour subgroup of the hazardous area 14 Table 4 Assessment for T4 classification according to component size and ambient temperature 23 Table 5 Use of spark and particle barriers 24 Table 6
35、Action to be taken when the pressurization with the protective gas fails for electrical apparatus without an internal source of release24 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Thu
36、 Nov 09 01:17:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60079-14:1997 BSI 05-19995 Introduction When electrical apparatus is to be installed in areas where dangerous concentrations and quantities of flammable gases, vapours, mists, ignitable fibres or dusts may be present in the atmosphere, p
37、rotective measures are applied to reduce the likelihood of explosion due to ignition by arcs, sparks or hot surfaces, produced either in normal operation or under specified fault conditions. This part of IEC 79 is supplementary to other relevant IEC standards, for example IEC 364 as regards electric
38、al installation requirements, and also refers to IEC 79-0 and its associated standards for the construction, testing and marking requirements of suitable electrical apparatus. By careful design of the electrical installation, it is frequently possible to locate much of the electrical apparatus in le
39、ss hazardous or non-hazardous areas. For an explosion to occur, an explosive atmosphere and a source of ignition need to co-exist. Protective measures aim to reduce to an acceptable level the likelihood that the electrical installation could become a source of ignition. It has been found practical t
40、o classify hazardous areas into zones according to the likelihood of an explosive gas atmosphere being present (see IEC 79-10). Such classification allows appropriate types of protection to be specified for each zone. Several types of protection are now available for electrical apparatus in hazardou
41、s areas (see IEC 79-0), and this standard gives the specific requirements for design, selection and erection of electrical installations in explosive atmospheres. This standard is based on the assumption that electrical apparatus is correctly installed, tested, maintained and used in accordance with
42、 its specified characteristics. In any industrial installation, irrespective of size, there may be numerous sources of ignition apart from those associated with electrical apparatus. Precautions may be necessary to ensure safety, but guidance on this aspect is outside the scope of this standard. 1 S
43、cope and object This part of IEC 79 contains the specific requirements for the design, selection and erection of electrical installations in explosive gas atmospheres. These requirements are in addition to the requirements for installations in non-hazardous areas. This standard applies to all electr
44、ical equipment and installations in hazardous areas whether permanent, temporary, portable, transportable or hand-held. It applies to installations at all voltages. This standard does not apply to electrical installations in mines susceptible to firedamp; NOTEThis standard may apply to electrical in
45、stallations in mines where explosive gas atmospheres other than firedamp may be formed and to electrical installations in the surface installation of mines. electrical installations in areas where the hazard is due to ignitable dusts or fibres; inherently explosive situations, for example explosives
46、 manufacturing and processing; rooms used for medical purposes. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 79. At the time of publication, the editions indicated were valid. All normativ
47、e documents are subject to revision, and parties to agreements based on this part of IEC 79 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 Standa
48、rds. IEC 34-5:1991, Rotating electrical machines Part 5: Classification of degrees of protection provided by enclosures of rotating electrical machines (IP code). IEC 50(426):1990, International Electrotechnical Vocabulary (IEV) Chapter 426: Electrical apparatus for explosive atmospheres. IEC 60-1:1
49、989, High-voltage test techniques Part 1: General definitions and test requirements. IEC 79-0:1983, Electrical apparatus for explosive gas atmospheres Part 0: General requirements. Amendment 1 (1987) Amendment 2 (1991 ) IEC 79-1:1990, Electrical apparatus for explosive gas atmospheres Part 1: Construction and verification test of flameproof enclosures of electrical apparatus. IEC 79-2:1983, Electrical apparatus for explosive gas atmospheres Part 2: Electrical apparatus type of protection “p”. IEC