1、 IEC 61892-7 Edition 3.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Mobile and fixed offshore units Electrical installations Part 7: Hazardous areas Units mobiles et fixes en mer Installations lectriques Partie 7: Emplacements dangereux IEC 61892-7:2014-12(en-fr) colour inside THIS PUBLICAT
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19、 nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61892-7 Edition 3.0 2014-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Mobile and fixed offshore units Electrical installations Part 7: Hazardous areas Units mobiles et fixes en mer Inst
20、allations lectriques Partie 7: Emplacements dangereux INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XC ICS 47.020.60 PRICE CODE CODE PRIX ISBN 978-2-8322-1986-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission
21、Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 61892-7:2014 IEC 2014 CONTENTS FOREWORD . 8 INTRODUCTION . 10 1 S
22、cope 11 2 Normative references 11 3 Terms and definitions 13 4 Area classification . 20 4.1 General . 20 4.2 Safety principles . 20 4.3 Sources of release 21 4.4 Type of zone . 22 4.5 Relative density of the gas or vapour when it is released 22 4.6 Mobile drilling units . 22 General . 22 4.6.1Zone 0
23、 . 23 4.6.2Zone 1 . 23 4.6.3Zone 2 . 23 4.6.4Well test facilities 23 4.6.5 4.7 Fixed units 24 General . 24 4.7.1Zone 0 . 24 4.7.2Zone 1 . 24 4.7.3Zone 2 . 24 4.7.4Drilling facilities . 24 4.7.5 4.8 Floating production units . 24 4.9 Provisions regarding all types of offshore units (floating, mobile
24、and fixed units) 25 4.10 Openings, access and ventilation conditions affecting the extent of hazardous areas . 25 General . 25 4.10.1Enclosed space with direct access to any zone 1 location 25 4.10.2Enclosed space with direct access to any zone 2 location 25 4.10.3Warning notices . 26 4.10.4 5 Elect
25、rical systems 26 5.1 Sources of electrical power . 26 5.2 Distribution systems 26 General . 26 5.2.1Earth fault detection 26 5.2.2 5.3 Electrical protection 26 5.4 Emergency conditions due to drilling operations Mobile drilling units 27 5.5 Emergency switch-off Ignition source control Production uni
26、ts . 28 General . 28 5.5.1Low gas alarm . 28 5.5.2High gas alarm 29 5.5.3Manual disconnection 29 5.5.4 6 Protection from dangerous (incendive) sparking 29 6.1 General . 29 6.2 Light metal as construction materials 29 IEC 61892-7:2014 IEC 2014 3 6.3 Dangers from live parts . 29 6.4 Dangers from expos
27、ed and extraneous conductive parts . 29 General . 29 6.4.1System with earthed neutral 30 6.4.2System with isolated or impedance earthed neutral . 30 6.4.3Systems in zone 0 . 30 6.4.4SELV and PELV systems . 30 6.4.5Electrical separation 30 6.4.6Non Ex electrical equipment above hazardous areas . 30 6
28、.4.7 6.5 Potential equalization 31 General . 31 6.5.1Temporary bonding 31 6.5.2 6.6 Static electricity 32 6.7 Cathodically protected metallic parts . 32 6.8 Electromagnetic radiation 32 6.9 Danger from mechanical parts 32 7 Assurance of conformity of equipment . 33 7.1 Equipment with certificates ac
29、cording to IEC standards 33 General . 33 7.1.1IEC standards 33 7.1.2Equipment without certificates according to IEC standards 33 7.1.3 7.2 Selection of repaired, second hand or existing equipment . 33 7.3 Qualifications of personnel 33 8 Selection of equipment (excluding cables and conduits) 34 8.1
30、General . 34 8.2 Information requirements 34 8.3 Zones . 34 8.4 Relationship between equipment protection levels (EPLs) and zones 34 8.5 Selection of equipment according to EPLs 34 General . 34 8.5.1Relationship between EPLs and types of protection . 35 8.5.2Equipment for use in locations requiring
31、EPL Ga 35 8.5.3Equipment for use in locations requiring EPL Gb 35 8.5.4Equipment for use in locations requiring EPL Gc 36 8.5.5 8.6 Selection according to equipment grouping . 36 8.7 Selection according to the ignition temperature of the gas or vapour and ambient temperature . 36 General . 36 8.7.1G
32、as or vapour 37 8.7.2 8.8 Selection of radiating equipment . 37 8.9 Selection of ultrasonic equipment . 37 8.10 Selection to cover external influences . 37 8.11 Selection of transportable, portable and personal equipment 38 Transportable and portable equipment . 38 8.11.1Personal equipment . 38 8.11
33、.2 8.12 RFID tags . 39 9 Cable system General 39 9.1 Cables 39 9.2 Connections 39 4 IEC 61892-7:2014 IEC 2014 9.3 Jointing . 40 9.4 Cable system 40 Construction 40 9.4.1Earthing of metallic covering 40 9.4.2 9.5 Conduit systems . 40 9.6 Cable and conduit systems . 41 Zone 0, EPL Ga . 41 9.6.1Cable a
34、nd conduit systems for zone 1 and 2, EPL, Gb and Gc . 41 9.6.2 9.7 Installation requirements . 42 Circuits traversing a hazardous area 42 9.7.1Terminations 42 9.7.2Unused cores 42 9.7.3 10 Cable entry systems and blanking elements 42 10.1 General . 42 10.2 Connections of cables to equipment 42 10.3
35、Selection of cable glands 43 10.4 Additional entries other than Ex d or Ex nR . 44 10.5 Unused openings 44 10.6 Additional requirements for type of protection d Flameproof enclosures 44 General . 44 10.6.1Selection of cable glands . 45 10.6.2 10.7 Additional requirements for type of protection nR Re
36、stricted breathing enclosure 45 11 Rotating electrical machines 45 11.1 Type of protection d Flameproof enclosures . 45 11.2 Type of protection e Increased safety . 45 11.3 Type of protection p Pressurized enclosures 45 11.4 Type of protection nA Non-sparking 45 11.5 Ex protected permanent magnet mo
37、tor 46 12 Electric heating systems 46 12.1 General . 46 12.2 Temperature monitoring 46 12.3 Limiting temperature . 46 12.4 Safety device 46 12.5 Electrical trace heating systems 47 13 Additional requirements for type of protection d Flameproof enclosures 47 13.1 General . 47 13.2 Solid obstacles . 4
38、8 13.3 Protection of flameproof joints. 48 13.4 Conduit systems . 49 14 Additional requirements for type of protection e Increased safety 49 14.1 General . 49 14.2 Maximum dissipated power of terminal box enclosures . 49 14.3 Conductor terminations . 50 14.4 Maximum number of conductors in relation
39、to the cross-section and the permissible continuous current 50 15 Additional requirements for type of protection i Intrinsic safety 50 15.1 Introductory remark . 50 15.2 Earthing of intrinsically safe circuits 51 IEC 61892-7:2014 IEC 2014 5 15.3 Earthing of conducting screens . 52 15.4 Cable braid b
40、onding 52 15.5 Verification of intrinsically safe circuits 52 15.6 Simple apparatus 52 16 Additional requirements for pressurized enclosures . 53 16.1 General . 53 16.2 Type of protection p. 53 General . 53 16.2.1Ducting 54 16.2.2Action to be taken on failure of pressurization . 54 16.2.3Multiple pr
41、essurized enclosures with a common safety device . 56 16.2.4Purging 57 16.2.5Protective gas 57 16.2.6 17 Pressurized rooms . 57 17.1 General . 57 17.2 Doors 58 17.3 Inlets and outlets 58 17.4 Clean air supply 58 Source of clean air 58 17.4.1Minimum flow rate . 58 17.4.2 17.5 Purging . 58 General . 5
42、8 17.5.1Sequence of operations of the purging safety devices . 59 17.5.2Enclosures within the room 59 17.5.3 17.6 Safety devices 59 General . 59 17.6.1Safety devices based on type of protection 60 17.6.2 17.7 Failure of the pressurization system 60 17.8 Pressurized room in a hazardous area . 60 Gene
43、ral 60 Preventing the explosive atmosphere from entering an open door . 60 17.8.2 17.9 Gas detection . 61 17.10 Action when pressurization system fails 61 Type of protection px 61 17.10.1Type of protection py 61 17.10.2Re-energizing the room . 62 17.10.3 17.11 Marking . 62 18 Analyser houses 62 19 A
44、dditional requirements for type of protection n . 62 20 Additional requirements for type of protection o Oil immersion . 63 21 Additional requirements for type of protection q Powder filling . 63 22 Additional requirements for type of protection m Encapsulation . 63 23 Additional requirements for ty
45、pe of protection op Optical radiation 63 24 Ventilation . 63 24.1 General . 63 24.2 Ventilation of spaces containing electrical apparatus 64 24.3 Ventilation of other hazardous spaces. 64 25 Ventilation requirements for battery compartments 64 6 IEC 61892-7:2014 IEC 2014 25.1 General . 64 25.2 Venti
46、lation requirements . 64 25.3 Natural ventilation . 66 25.4 Forced ventilation . 67 25.5 Fans and ducts . 67 26 Inspection, maintenance, repair and overhaul 67 26.1 Initial inspection 67 26.2 In-service inspection . 67 26.3 Isolation of apparatus . 68 26.4 Precautions concerning the use of ignition
47、sources . 68 26.5 Repair and overhaul 68 26.6 Personnel qualifications 68 27 Documentation 68 Annex A (informative) Examples of sources of release Process plant 71 A.1 General . 71 A.2 Sources giving a continuous grade of release . 71 A.3 Sources giving a primary grade of release 71 A.4 Sources givi
48、ng a secondary grade of release 71 Annex B (informative) Schematic approach to the classification of hazardous areas 72 Annex C (informative) Hazardous area data sheets and symbols . 74 C.1 Hazardous area classification data sheet 74 C.2 Symbols for hazardous area classification drawings 74 Annex D
49、(informative) Introduction of an alternative risk assessment method encompassing equipment protection levels for Ex equipment 78 D.1 General . 78 D.2 Historical background . 78 D.3 Risk assessment . 79 D.3.1 Gases (Group II) 79 D.3.2 EPL Ga 79 D.3.3 EPL Gb 79 D.3.4 EPL Gc 79 D.4 Risk of ignition protection afforded 79 Annex E (informative) Electrical installations in
