1、 IEC 60079-1 Edition 7.0 2014-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 1: Equipment protection by flameproof enclosures “d” Atmosphres explosives Partie 1: Protection du matriel par enveloppes antidflagrantes d IEC 60079-1:2014-06(en-fr) colour inside THIS PUBLICATIO
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19、ous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60079-1 Edition 7.0 2014-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 1: Equipment protection by flameproof enclosures “d” Atmosphres explosives Partie 1: Prote
20、ction du matriel par enveloppes antidflagrantes d INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XD ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1663-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Elec
21、trotechnique 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 60079-1:2014 IEC 2014 CONTENTS FOREWORD . 8 1 Scope 16 2 Normative re
22、ferences 16 3 Terms and definitions 17 4 Level of protection (equipment protection level, EPL) 19 4.1 General . 19 4.2 Requirements for level of protection “da” 19 4.3 Requirements for level of protection “db” 20 4.4 Requirements for level of protection “dc” . 20 4.4.1 General . 20 4.4.2 Constructio
23、n of “dc” devices 20 4.4.3 Tests for “dc” devices 20 5 Flameproof joints . 21 5.1 General requirements . 21 5.2 Non-threaded joints 22 5.2.1 Width of joints (L) 22 5.2.2 Gap (i) . 22 5.2.3 Spigot joints. 22 5.2.4 Holes in joint surfaces . 23 5.2.5 Conical joints . 25 5.2.6 Joints with partial cylind
24、rical surfaces (not permitted for Group IIC) . 25 5.2.7 Flanged joints for acetylene atmospheres 26 5.2.8 Serrated joints . 26 5.2.9 Multi-step joints . 27 5.3 Threaded joints . 30 5.4 Gaskets (including O-rings) . 30 5.5 Equipment using capillaries 32 6 Sealed joints 32 6.1 Cemented joints 32 6.1.1
25、 General . 32 6.1.2 Mechanical strength. 32 6.1.3 Width of cemented joints . 33 6.2 Fused glass joints . 33 6.2.1 General . 33 6.2.2 Width of fused glass joints . 33 7 Operating rods . 33 8 Supplementary requirements for shafts and bearings. 34 8.1 Joints of shafts . 34 8.1.1 General . 34 8.1.2 Cyli
26、ndrical joints 34 8.1.3 Labyrinth joints 34 8.1.4 Joints with floating glands 34 8.2 Bearings . 36 8.2.1 Sleeve bearings . 36 8.2.2 Rolling-element bearings . 36 IEC 60079-1:2014 IEC 2014 3 9 Light-transmitting parts 36 10 Breathing and draining devices which form part of a flameproof enclosure 37 1
27、0.1 General . 37 10.2 Openings for breathing or draining 37 10.3 Composition limits . 37 10.4 Dimensions . 37 10.5 Elements with measurable paths . 37 10.6 Elements with non-measurable paths 37 10.7 Removable devices . 38 10.7.1 General . 38 10.7.2 Mounting arrangements of the elements 38 10.8 Mecha
28、nical strength 38 10.9 Breathing devices and draining devices when used as Ex components . 38 10.9.1 General . 38 10.9.2 Mounting arrangements of the elements and components 38 10.9.3 Type tests for breathing and draining devices used as Ex components 38 10.9.4 Ex component certificate . 41 11 Faste
29、ners and openings 42 12 Materials . 43 13 Entries for flameproof enclosures 44 13.1 General . 44 13.2 Threaded holes . 44 13.3 Non-threaded holes (for Group I only) . 44 13.4 Cable glands . 45 13.5 Conduit sealing devices 45 13.6 Plugs and sockets and cable couplers 46 13.7 Bushings . 47 13.8 Blanki
30、ng elements. 47 14 Verification and tests . 47 15 Type tests . 48 15.1 General . 48 15.2 Tests of ability of the enclosure to withstand pressure 49 15.2.1 General . 49 15.2.2 Determination of explosion pressure (reference pressure) . 49 15.2.3 Overpressure test 52 15.3 Test for non-transmission of a
31、n internal ignition 53 15.3.1 General . 53 15.3.2 Electrical equipment of Groups I, IIA and IIB 55 15.3.3 Electrical equipment of Group lIC 56 15.4 Tests of flameproof enclosures with breathing and draining devices . 57 15.4.1 General . 57 15.4.2 Tests of ability of the enclosure to withstand pressu
32、re . 57 15.4.3 Thermal tests . 58 15.4.4 Test for non-transmission of an internal ignition . 58 15.5 Tests for “dc” devices . 59 15.5.1 General . 59 15.5.2 Preparation of “dc” samples . 59 15.5.3 Test conditions for “dc” devices . 59 4 IEC 60079-1:2014 IEC 2014 16 Routine tests . 60 16.1 General . 6
33、0 16.2 Enclosures not incorporating a welded construction 61 16.3 Enclosures incorporating a welded construction 61 16.4 Bushings not specific to one flameproof enclosure 61 16.5 Acceptance criteria . 61 16.6 Batch testing . 61 17 Switchgear for Group I . 62 17.1 General . 62 17.2 Means of isolation
34、 . 62 17.2.1 General . 62 17.3 Doors or covers 62 17.3.1 Quick-acting doors or covers . 62 17.3.2 Doors or covers fixed by screws 62 17.3.3 Threaded doors or covers 63 18 Lampholders and Iamp caps 63 18.1 General . 63 18.2 Device preventing lamps working loose . 63 18.3 Holders and caps for lamps wi
35、th cylindrical caps. 63 18.4 Holders for lamps with threaded caps . 63 19 Non-metallic enclosures and non-metallic parts of enclosures . 63 19.1 General . 63 19.2 Resistance to tracking and creepage distances on internal surfaces of the enclosure walls . 64 19.3 Requirements for type tests 64 19.4 T
36、est of erosion by flame 64 20 Marking . 64 20.1 General . 64 20.2 Caution and warning markings 65 20.3 Informative markings . 65 21 Instructions 65 Annex A (normative) Additional requirements for crimped ribbon elements and multiple screen elements of breathing and draining devices 66 Annex B (norma
37、tive) Additional requirements for elements, with non-measurable paths of breathing and draining devices 67 B.1 Sintered metal elements . 67 B.2 Pressed metal wire elements 67 B.3 Metal foam elements . 68 Annex C (normative) Additional requirements for flameproof entry devices 69 C.1 General . 69 C.2
38、 Constructional requirements . 69 C.2.1 Sealing methods 69 C.2.2 Flameproof joints . 70 C.2.3 Constructional requirements for Ex blanking elements . 71 C.2.4 Constructional requirements for Ex thread adapters. 73 C.3 Type tests . 73 C.3.1 Sealing test . 73 C.3.2 Test of mechanical strength . 74 IEC
39、60079-1:2014 IEC 2014 5 C.3.3 Type tests for Ex blanking elements 75 C.3.4 Type tests for Ex thread adapters 76 Annex D (normative) Empty flameproof enclosures as Ex components . 78 D.1 General . 78 D.2 Introductory remarks . 78 D.3 Ex component enclosure requirements 78 D.4 Utilization of an Ex com
40、ponent enclosure certificate to prepare an equipment certificate 80 D.4.1 Procedure 80 D.4.2 Application of the schedule of limitations . 80 Annex E (normative) Cells and batteries used in flameproof “d” enclosures . 81 E.1 Introductory remarks . 81 E.2 Acceptable electrochemical systems . 81 E.3 Ge
41、neral requirements for cells (or batteries) inside flameproof enclosures 82 E.4 Arrangement of safety devices 82 E.4.1 Prevention of excessive temperature and cell damage . 82 E.4.2 Prevention of cell polarity reversal or reverse charging by another cell in the same battery 83 E.4.3 Prevention of in
42、advertent charging of a battery by other voltage sources in the enclosure . 83 E.5 Recharging of secondary cells inside flameproof enclosures . 84 E.6 Rating of protection diodes and reliability of protection devices . 85 Annex F (informative) Mechanical properties for screws and nuts 86 Annex G (no
43、rmative) Additional requirements for flameproof enclosures with an internal source of release (containment system) . 87 G.1 General . 87 G.2 Release conditions 87 G.2.1 No release . 87 G.2.2 Limited release of a gas or vapour . 88 G.2.3 Limited release of a liquid 88 G.3 Design requirements for the
44、containment system 88 G.3.1 General design requirements . 88 G.3.2 Infallible containment system . 88 G.3.3 Containment system with a limited release 89 G.4 Type tests for the containment system 89 G.4.1 Overpressure test 89 G.4.2 Leakage test for an infallible containment system 89 G.4.3 Leakage te
45、st for a containment system with a limited release 90 Annex H (normative) Requirements for machines with flameproof “d” enclosures fed from converters . 91 H.1 General . 91 H.2 Construction requirements for bearings . 91 H.3 Temperature requirements 91 Bibliography 92 Figure 1 Example of constructio
46、n for indirect checking of a flanged Group I flameproof joint . 22 Figure 2 Spigot joints . 23 Figure 3 Holes in surfaces of flanged joints, example 1 24 6 IEC 60079-1:2014 IEC 2014 Figure 4 Holes in surfaces of flanged joints, example 2 24 Figure 5 Holes in surfaces of flanged joints, example 3 24
47、Figure 6 Holes in surfaces of spigot joints, example 1 24 Figure 7 Holes in surfaces of spigot joints, example 2 25 Figure 8 Holes in surfaces of spigot joints, example 3 25 Figure 9 Examples of joint constructions 26 Figure 10 Illustration of the requirements concerning gaskets Example 1 31 Figure
48、11 Illustration of the requirements concerning gaskets Example 2 31 Figure 12 Illustration of the requirements concerning gaskets Example 3 31 Figure 13 Illustration of the requirements concerning gaskets Example 4 31 Figure 14 Illustration of the requirements concerning gaskets Example 5 31 Figure
49、15 Illustration of the requirements concerning gaskets Example 6 31 Figure 16 Illustration of the requirements concerning gaskets Example 7 32 Figure 17 Example of cylindrical joint for shaft of rotating electrical machine 35 Figure 18 Example of labyrinth joint for shaft of rotating electrical machine . 35 Figure 19 Example of joint with floating gland for shaft of rotating electrical machine 35 Figure 20
