SIST EN 60079-7:2007
Explosive atmospheres -- Part 7: Equipment protection by increased safety e
Explosive atmospheres -- Part 7: Equipment protection by increased safety e
This part of IEC 60079 specifies the requirements for the design, construction, testing and marking of electrical apparatus with type of protection increased safety "e" intended for use in explosive gas atmospheres. This standard applies to electrical apparatus where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. Additional measures are applied to ensure that the apparatus does not produce arcs, sparks, or excessive temperatures in normal operation or under specified abnormal conditions. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
Explosionsfähige Atmosphäre -- Teil 7: Geräteschutz durch erhöhte Sicherheit e
Atmosphères explosives -- Partie 7: Protection de l'équipment par sécurité augmentée e
La présente partie de la CEI 60079 décrit les exigences spécifiques de conception, de construction, d'essais et de marquage du matériel électrique avec mode de protection de sécurité augmentée 'e' destiné à être utilisé dans les atmosphères explosives gazeuses. La présente norme s'applique au matériel électrique ayant une tension assignée ne dépassant pas 11 kV en courant alternatif (valeur efficace) ou en courant continu. Des mesures supplémentaires sont appliquées pour que le matériel ne produise ni arc, ni étincelle, ni température excessive en fonctionnement normal ou dans des conditions anormales spécifiées.
Eksplozivne atmosfere - 7. del: Zaščita opreme s povečano varnostjo "e" (IEC 60079-7:2006)
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosive atmospheres - Part 7: Equipment protection by increased safety "e"Atmospheres explosives - Partie 7: Protection de l'équipment par sécurité augmentée "e"Explosionsfahige Atmosphäre - Teil 7: Geräteschutz durch erhöhte Sicherheit "e"29.260.20Electrical apparatus for explosive atmospheresICS:SIST EN 60079-7:2007en,fr,deTa slovenski standard je istoveten z:EN 60079-7:200701-december-2007SIST EN 60079-7:2007SLOVENSKI
STANDARDSIST EN 60079-7:20031DGRPHãþD
EUROPEAN STANDARD EN 60079-7 NORME EUROPÉENNE
EUROPÄISCHE NORM January 2007
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für 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 worldwide for CENELEC members.
Ref. No. EN 60079-7:2007 E
ICS 29.260.20 Supersedes EN 60079-7:2003
English version
Explosive atmospheres -
Part 7: Equipment protection by increased safety "e" (IEC 60079-7:2006)
Atmosphères explosives -
Partie 7: Protection de l'équipment par sécurité augmentée "e" (CEI 60079-7:2006)
Explosionsfahige Atmosphäre -
Teil 7: Geräteschutz durch erhöhte Sicherheit "e" (IEC 60079-7:2006)
This European Standard was approved by CENELEC on 2006-10-01. 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 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 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 official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, 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 60079-7:2007 - 2 - Foreword The text of document 31/623/FDIS, future edition 4 of IEC 60079-7, prepared by IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60079-7 on 2006-10-01. This European Standard supersedes EN 60079-7:2003. The significant changes with respect to EN 60079-7:2003 are: – requirements for electrical connections expanded and clarified; – requirements for luminaire ballasts expanded and clarified, – requirements for evaluation and testing of motor rotors clarified. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2007-08-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2009-10-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 94/9/EC. See Annex ZZ. Annexes ZA and ZZ have been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60079-7:2006 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60034-17 NOTE
Harmonized as CLC/TS 60034-17:2004 (not modified). IEC 60079-14 NOTE
Harmonized as EN 60079-14:2003 (not modified). IEC 60079-17 NOTE
Harmonized as EN 60079-17:2003 (not modified). IEC 60079-18 NOTE
Harmonized as EN 60079-18:2004 (not modified). IEC 60086-1 NOTE
Harmonized as EN 60086-1:2001 (not modified). IEC 60095-1 NOTE
Harmonized as EN 60095-1:1993 (not modified). IEC 60622 NOTE
Harmonized as EN 60622:2003 (not modified). IEC 60623 NOTE
Harmonized as EN 60623:2001 (not modified). IEC 61008-1 NOTE
Harmonized as EN 61008-1:2004 (not modified). IEC 61056-1 NOTE
Harmonized as EN 61056-1:2003 (not modified). IEC 61951-1 NOTE
Harmonized as EN 61951-1:2003 (not modified). IEC 62013-1 NOTE
Harmonized as EN 62013-1:2006 (not modified). __________
- 3 - EN 60079-7:2007 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60034-1 –1) Rotating electrical machines -
Part 1: Rating and performance EN 60034-1 20042)
IEC 60034-5 –1) Rotating electrical machines -
Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification EN 60034-5 20012)
IEC 60044-6 (mod) –1) Instrument transformers -
Part 6: Requirements for protective current transformers for transient performance EN 60044-6 19992)
IEC 60050-426 –1) International Electrotechnical Vocabulary (IEV) - Chapter 426: Electrical apparatus for explosive atmospheres - -
IEC 60061-1 (mod) –1) Lamp caps and holders together with gauges for the control of interchangeability and safety -
Part 1: Lamp caps EN 60061-1
19932)
IEC 60061-2 (mod) –1) Lamp caps and holders together with gauges for the control of interchangeability and safety -
Part 2: Lampholders EN 60061-2 19932)
IEC 60064 (mod) –1) Tungsten filament lamps for domestic and similar general lighting purposes - Performance requirements EN 60064 19952)
IEC 60068-2-6 –1) Environmental testing -
Part 2: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 19952)
IEC 60068-2-27 1987 Environmental testing -
Part 2: Tests - Test Ea and guidance: Shock EN 60068-2-27 1993
IEC 60068-2-42 –1) Environmental testing -
Part 2-42: Tests - Test Kc: Sulphur dioxide test for contacts and connections EN 60068-2-42 20032)
IEC 60079-0 (mod) 2004 Electrical apparatus for explosive gas atmospheres -
Part 0: General requirements EN 60079-0 2006
1) Undated reference. 2) Valid edition at date of issue.
EN 60079-7:2007 - 4 - Publication Year Title EN/HD Year IEC 60079-1 –1) Electrical apparatus for explosive gas atmospheres -
Part 1: Flameproof enclosures 'd' EN 60079-1 + corr. April
20042)2006
IEC 60079-11 –1) Explosive atmospheres -
Part 11: Equipment protection by intrinsic safety "i" EN 60079-11 20072)
IEC 60085 –1) Electrical insulation - Thermal classification EN 60085 20042)
IEC 60112 –1) Method for the determination of the proof and the comparative tracking indices of solid insulating materials EN 60112 20032)
IEC 60228 –1) Conductors of insulated cables EN 60228 + corr. May
20052)2005
IEC 60238 –1) Edison screw lampholders EN 60238 + corr. January
20042)2005
IEC 60317-3 2004 Specifications for particular types of winding wires - Part 3: Polyester enamelled round copper wire, class 155 - -
IEC 60317-7 1990 Specifications for particular types of winding wires - Part 7: Polyimide enamelled round copper wire, class 220 EN 60317-7 1994
IEC 60317-8 1990 Specifications for particular types of winding wires - Part 8: Polyesterimide enamelled round copper wire, class 180 EN 60317-8 1994
IEC 60317-13 1990 Specifications for particular types of winding wires - Part 13: Polyester or polyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200 EN 60317-13 1994
IEC 60364-5-55 –1) Electrical installations of buildings -
Part 5-55: Selection and erection of electrical equipment - Other equipments – –
IEC 60400 (mod) –1) Lampholders for tubular fluorescent lamps and starterholders EN 60400 20002)
IEC 60432-1 (mod) –1) Incandescent lamps - Safety specifications - Part 1: Tungsten filament lamps for domestic and similar general lighting purposes EN 60432-1 20002)
IEC 60529 –1) Degrees of protection provided by enclosures (IP Code) EN 60529 + corr. May
19912)1993
IEC 60664-1 1992 Insulation coordination for equipment within low-voltage systems -
Part 1: Principles, requirements and tests EN 60664-13)
2003
IEC 60947-1 –1) Low-voltage switchgear and controlgear - Part 1: General rules EN 60947-1 + corr. November
20042)2004
3) EN 60664-1 includes A1:2000 + A2:2002 to IEC 60664-1.
- 5 - EN 60079-7:2007 Publication Year Title EN/HD Year IEC 60947-7-1 –1) Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors EN 60947-7-1 20022)
IEC 60947-7-2 –1) Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective conductor terminal blocks for copper conductors EN 60947-7-2 20022)
IEC 60999-1 –1) Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units -
Part 1: General requirements and particular requirements for clamping units for conductors from 0,2 mm² up to 35 mm² (included) EN 60999-1 20002)
IEC 60999-2 –1) Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units -
Part 2: Particular requirements for clamping units for conductors above 35 mm² up to 300 mm² (included) EN 60999-2 20032)
IEC 61195 1999 Double-capped fluorescent lamps - Safety specifications EN 61195 1999
IEC 61347-2-3
A1 A2 2000
2004 2006 Lamp controlgear -
Part 2-3: Particular requirements for a.c. supplied electronic ballasts for fluorescent lamps EN 61347-2-3 + corr. July
A1 A2 2001 2003 2004 2006
IEC 62086-1 –1) Electrical apparatus for explosive gas atmospheres - Electrical resistance trace heating -
Part 1: General and testing requirements EN 62086-1 20052)
ISO 2859-1 –1) Sampling procedures for inspection by attributes -
Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection - -
EN 60079-7:2007 - 6 - Annex ZZ (informative)
Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers only the following essential requirements out of those given in Annex II of the EC Directive 94/9/EC: – ER 1.0.1 to ER 1.0.6 – ER 1.1.1 to ER 1.1.3 – ER 1.2.1, ER 1.2.2, ER 1.2.3, ER 1.2.5 to ER 1.2.8
– ER 1.3.1, ER 1.3.3, ER 1.3.4 – ER 1.4.1, ER 1.4.2 – ER 1.5.1 to ER 1.5.8 – ER 2.0.2.1, ER 2.0.2.3 Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned. WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard. ___________
IEC 60079-7Edition 4.0 2006-07INTERNATIONAL STANDARD NORME INTERNATIONALEExplosive atmospheres –
Part 7: Equipment protection by increased safety "e"
Atmosphères explosives – Partie 7: Protection de l'équipement par sécurité augmentée «e»
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XCICS 29.260.20 PRICE CODECODE PRIXISBN 2-8318-8726-7
– 2 – 60079-7 © IEC:2006
CONTENTS FOREWORD.5
1 Scope.7 2 Normative references.7 3 Terms and definitions.9 4 Constructional requirements for all electrical apparatus.12 4.1 General.12 4.2 Electrical connections.12 4.3 Clearances.15 4.4 Creepage distances.20 4.5 Solid electrical insulating materials.21 4.6 Windings.21 4.7 Temperature limitations.22 4.8 Wiring internal to apparatus.24 4.9 Degrees of protection provided by enclosures.24 4.10 Fasteners.24 5 Supplementary requirements for specific electrical apparatus.25 5.1 General.25 5.2 Rotating electrical machines.25 5.3 Luminaires.30 5.4 Caplights and handlights.34 5.5 Measuring instruments and instrument transformers.35 5.6 Transformers other than instrument transformers.35 5.7 Batteries.36 5.8 General purpose connection and junction boxes.42 5.9 Resistance heaters (other than trace heaters).42 5.10 Other electrical apparatus.44 6 Type verifications and type tests.44 6.1 Dielectric strength.44 6.2 Rotating electrical machines.45 6.3 Luminaires designed for mains supply.47 6.4 Measuring instruments and instrument transformers.49 6.5 Transformers other than instrument transformers.50 6.6 Secondary batteries.50 6.7 General purpose connection and junction boxes.53 6.8 Resistance heating devices and resistance heating units.53 6.9 Terminal insulating material tests.54 7 Routine verifications and routine tests.55 7.1 Dielectric tests.55 7.2 Dielectric tests for batteries.55 7.3 Inter-turn overvoltage tests.56 8 Ex component certificates.56 8.1 General.56 8.2 Terminals.56
60079-7 © IEC:2006 – 3 –
9 Marking and instructions.56 9.1 General marking.56 9.2 Instructions for use.57 9.3 Warning markings.59
Annex A (normative)
Cage motors − Methods of test and of calculation.60 Annex B (normative)
Type tests for specific forms of resistance heating devices or resistance heating units (other than trace heater).62 Annex C (informative)
Cage motors – Thermal protection in service.64 Annex D (informative)
Resistance heating devices and units – Additional electrical protection.65 Annex E (informative)
Combinations of terminals and conductors for general purpose connection and junction boxes.66 Annex F (informative)
Dimensions of copper conductors.68 Annex G (informative)
Potential stator winding discharge risk assessment – Ignition risk factors.69 Annex H (normative)
Test procedure for T8, T10 and T12 lamps.70 Annex I (Informative) Introduction of an alternative risk assessment method encompassing ‘Equipment Protection Levels’ for Ex Equipment.75
Bibliography.80
Figure 1 – Determination of creepage distances and clearances.20 Figure 2 – Minimum values of the time tE of motors in relation to the starting current ratio IA/IN.28 Figure 3 – Arrangement for the luminaire vibration test.49 Figure A.1 – Diagram illustrating the determination of time tE.61 Figure E.1 – Example of defined terminal/conductor arrangement table.67 Figure H.1 – Asymmetric pulse test circuit.71 Figure H.2 – Asymmetric power detection circuit.73 Figure H.3 – Flow Chart – Asymmetric power Test.74
Table 1 – Creepage distances and clearances.16 Table 2 – Tracking resistance of insulating materials.20 Table 3 – Limiting temperatures for insulated windings.23 Table 4 – Potential air gap sparking risk assessment for cage rotor ignition risk factors.27 Table 5 – Minimum distance between lamp and protective cover.31 Table 6 – Creepage distances and clearances for screw lamp caps.31 Table 7 − Resistance to the effect of short-circuit currents.35 Table 8 – Explosion test mixtures.46 Table 9 – Insertion torque and minimum removal torque.47 Table 10 – Value for pull-out tests.55 Table 11 – Creepage distances and clearances for screw lamp caps.58 Table 12 − Text of warning markings.59
– 4 – 60079-7 © IEC:2006
Table F.1 – Standard cross-sections of copper conductors.68 Table G.1 – Potential stator winding discharge risk assessment – Ignition risk factors.69 Table I.1 – Traditional relationship of EPLs to Zones (no additional risk assessment).77 Table I.2 – Description of risk of ignition protection provided.78
60079-7 © IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
EXPLOSIVE ATMOSPHERES –
Part 7: Equipment protection
by increased safety "e"
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-7 has been prepared by IEC technical committee 31: Equipment for explosive atmospheres. This fourth edition cancels and replaces the third edition published in 2001, and constitutes a technical revision. The significant changes with respect to the previous edition are listed below: – requirements for electrical connections expanded and clarified, – requirements for luminaire ballasts expanded and clarified, – requirements for evaluation and testing of motor rotors clarified.
– 6 – 60079-7 © IEC:2006
The text of this standard is based on the following documents: FDIS Report on voting 31/623/FDIS 31/639/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. Cette publication a été rédigée selon les Directives ISO/CEI, Partie 2. The list of all parts of IEC 60079 series, under the general title Explosive atmospheres, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed; • withdrawn; • replaced by a revised edition, or • amended.
60079-7 © IEC:2006 – 7 –
EXPLOSIVE ATMOSPHERES –
Part 7: Equipment protection
by increased safety "e"
1 Scope This part of IEC 60079 specifies the requirements for the design, construction, testing and marking of electrical apparatus with type of protection increased safety "e" intended for use in explosive gas atmospheres. This standard applies to electrical apparatus where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. Additional measures are applied to ensure that the apparatus does not produce arcs, sparks, or excessive temperatures in normal operation or under specified abnormal conditions. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
NOTE
Increased safety "e" can provide Equipment Protection Levels (EPL) Mb or Gb. For further information, see Annex I. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance IEC 60034-5, Rotating electrical machines – Part 5: Degrees of protection provided by the internal design of rotating electrical machines (IP code) – Classification
IEC 60044-6, Instrument transformers – Part 6: Requirements for protective current trans-formers for transient performance IEC 60050(426), International Electrotechnical Vocabulary (IEV) – Chapter 426: Electrical apparatus for explosive atmospheres IEC 60061-1, Lamp caps and holders together with gauges for the control of interchangeability and safety – Part 1: Lamp caps IEC 60061-2, Lamp caps and holders together with gauges for the control of interchangeability and safety – Part 2: Lampholders IEC 60064, Tungsten filament lamps for domestic and similar general lighting purposes – Performance requirements IEC 60068-2-6, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)
– 8 – 60079-7 © IEC:2006
IEC 60068-2-27:1987, Environmental testing – Part 2: Tests – Test Ea and guidance: Shock IEC 60068-2-42, Environmental testing –
Part 2-42: Tests –
Test Kc: Sulphur dioxide test for contacts and connections IEC 60079-0:2004, Electrical apparatus for explosive gas atmospheres – Part 0: General requirements IEC 60079-1, Electrical apparatus for explosive gas atmospheres – Part 1: Flameproof enclosures "d"
IEC 60079-11, Electrical apparatus for explosive gas atmospheres – Part 11: Equipment
protection by intrinsic safety "i" IEC 60085, Electrical insulation – Thermal classification IEC 60112, Method for the determination of the proof and the comparative tracking indices of solid insulating materials IEC 60228, Conductors of insulated cables IEC 60238, Edison screw lampholders IEC 60317-3:2004, Specifications for particular types of winding wires – Part 3: Polyester enamelled round copper wires, class 155 IEC 60317-7:1990, Specifications for particular types of winding wires – Part 7: Polyimide enamelled round copper wire, class 220
IEC 60317-8:1990, Specifications for particular types of winding wires – Part 8: Polyesterimide enamelled round copper wire, class 180
IEC 60317-13:1990, Specifications for particular types of winding wires – Part 13: Polyester or polyesterimide overcoated with polyamide-imide enamelled round copper wire, class 200
IEC 60364-3, Electrical installations of buildings – Part 5-55: Selection and erection of electrical equipment – Other equip
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