IEC 79-12 Ed 1 (1978) Electrical Apparatus for Explosive Gas Atmospheres Part 12 Classification o
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Transcript of IEC 79-12 Ed 1 (1978) Electrical Apparatus for Explosive Gas Atmospheres Part 12 Classification o
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iWIiation 79-12: 1-EC - 79 PT*J2 78 m 4844891 0080234 8 m -
CO M M I S S I O N L E C T R O T E C H N I Q U E I N T E R N A T I O N A L E
RAPPORT D E LA C E I
I N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S 1 O N I E C REPORT
Publication 79-12 Premire dition - First edition
1 9 7 8
Matriel lectrique pour atmosphres explosives Douzime partie: Classement des mlanges de gaz ou de vapeurs et dair
suivant leur interstice exprimental maximal de scurit et leur courant minimal dinflammation
Electrical apparatus for explosive gas atmospheres Part 12: Classification of mixtures of gases or vapours with air
according to their maximum experimental safe yaps and minimum igniting currents
Droits de reproduction rservs - Copyright - all rights reserved
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I E C 7 9 P T * 2 2 78 4 8 4 4 8 9 1 0080235 T m
Rvision de la prsente publication
Le contenu technique des publications de la CE1 est constam- ment revu par la Commission afin dassurer quil reflte bien ltat actuel de la technique.
Les renseignements relatifs ce travail de rvision, ltablisse- ment des ditions rvises et aux mises jour peuvent tre obtenus auprs des Comits nationaux de la CE1 et en consultant les docu- ments ci-dessous:
Bulletin de la CE1
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Terminologie
En ce qui concerne la terminologie gnrale, le lecteur se reportera la Publication 50 de la CEI: Vocabulaire Electro- technique International (V.E.I.), qui est tablie sous forme de chapitres spars traitant chacun dun sujet dfini, lIndex gnral tant publi sparment. Des dtails complets sur le V.E.I. peuvent tre obtenus sur demande.
Les termes et dfinitions figurant dans la prsente publication ont t soit repris du V.E.I., soit spcifiquement approuvs aux fins de cette publication.
Symboles graphiques et littraux
Pour les symboles graphiques, symboles littraux et signes dusage gnral approuvs par la CEI, le lecteur consultera:
- ia Publication 27 de la CEI: Symboles littraux utiliser en lectrotechnique;
- la Publication 117 de la CEI: Symboles graphiques recom- mandes.
Les symboles et signes contenus dans la prsente publication ont t soit repris des Publications 27 ou 117 de la CEI, soit spcifiquement approuvs aux fins de cette publication.
Autres publications de la C E 1 tablies par le mme Comit dEtudes
Lattention du lecteur est attire sur la page 3 de la couverture, qui numre les autres publications de la CE1 prpares par le Comit dEtudes qui a tabli la presente publication.
Revision of this publication
The technical content of I E C publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology.
Information on the work of revision, the issue of revised editions and amendment sheets may be obtained from I E C National Committees and from the following I E C sources:
0 IECBulletin
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Terminology
For general terminology, readers are referred to I E C Publi- cation 50: fiternational Electrotechnical Vocabulary Q.E.V.), which is issued in the form of separate chapters each dealing with a specific field, the General Index being published as a separate booklet. Full details of the I.E.V. will be supplied on request.
The terms and definitions contained in the present publication have either been taken from the I.E.V. or have been specifically approved for the purpose of this publication.
Graphical and letter symbols
For graphical symbols, and letter symbols and signs approved by the I E C for general use, readers are referred to:
- I E C Publication 27: Letter symbols to be used in electrical technology ;
- I E C Publication 117: Recommended graphical symbols.
The symbols and signs contained in the present publication have either been taken from I E C Publications 27 or 117, or have been specifically approved for the purpose of this publi- caiion.
Other I E C publications prepared by the same Technical Committee
The attention of readers is drawn to the inside of the back cover, which lists other I E C publications issued by the Technical Committee which has prepared the present publication.
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C O M M I S S 1 0 N L E G T R O T E C H N I Q U E I N T E R N A T I O N A L E R A P P O R T D E L A C E 1
I N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S I O N
I E C R E P O R T
Publication 79-12 Premire dition - First edition
1 9 7 8
Matriel lectrique pour atmosphres explosives Douzime partie: Classement des mlanges de gaz ou de vapeurs et dair
suivant leur interstice exprimental maximal de scurit et leur courant minimal dinflammation
Electrical apparatus for explosive gas atmospheres Part 12: Classification of mixtures of gases or vapours with air
according to their maximum experimental safe gaps and minimum igniting currents
Droits de reproduction rservs - Copyright - all rights reserved Aucune partie de cette publication ne peut Btre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mca- nique, y compris la photocopie et les microfilms, sans laccord crit de IBditeur.
No part of this publication may be reproduced o r . utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission i n writing from the publisher.
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IEC 77 P T * 3 2 78 4844893 0080337 3 W
- 2 -
COMMISSION LECTROTECHNIQUE INTERNATIONALE
MAmRIEL LECTRIQUE POUR ATMOSPHRES EXPLOSIVES .
Douzime partie: Classement des mlanges de gaz ou de vapeurs et dair suivant leur interstice exprimental maximal de scurit
et leur courant minimal dinflammation
PRAMBULE
1) Les dcisions ou accords officiels de la CE1 en ce qui concerne les questions techniques, prpars par des Comits dEtudes OU sont reprsents tous les Comits nationaux sintressant ces questions, expriment dans la plus grande mesure possible un accord international sur les sujets examins.
2) Ces dcisions constituent des recommandations internationales et sont agres comme telles par les Comits nationaux.
3) Dans le but dencourager lunification internationale, la CE1 exprime le vu que tous les Comits nationaux adoptent dans leurs rgles nationales le texte de la recommandation de la CEI, dans la mesure o les conditions nationales le permettent. Toute divergence entre la recommandation de la CE1 et la rgle nationale correspondante doit, dans la mesure du possible, tre indique en termes clairs dans cette dernire.
PREFACE
Le prsent rapport a t tabli par le Comit dEtudes No 31 de la CEI: Matriel lectrique pour atmosphres explosives.
I1 constitue une partie dune srie de publications traitant du matriel lectrique utilis dans les atmosphres explosives.
Les parties suivantes de la Publication 79 de la CEI: Matriel lectrique pour atmosphres explosives, sont dj parues;
- Introduction gnrale (Publication 79-0). - Construction, vrification et essais des enveloppes antidflagrantes de matriel lectrique (Publication 79-1). - Annexe D: Mthode dessai pour la dtermination de linterstice exprimental maximal de scurit (Publication 79-1A). - enveloppes surpression interne (Publication 79-2). - Eclateur pour circuits de scurit intrinsque (Publication 79-3). - Mthode dessai pour la dtermination de la temprature dinflammation (Publications 79-4 et 79-4A). - Protection par remplissage pulvrulent (Publications 79-5 et 79-5A). - Matriel immerg dans lhuile (Publication 79-6). - Construction, vri6cation et essais du matriel lectrique en protection a e )) (Publication 79-7). - Classification des tempratures maximales de surface (Publication 79-8). - Marquage (Publication 79-9). - Classification des zones dangereuses (Publication 79-10). - Construction et essais du matriel scurit intrinsque et du matriel associ (Publication 79-11).
Un projet fut discut lors de la runion tenue Paris en 1974. A la suite de cette runion, un projet, document 31(Bureau Central)39, fut soumis lapprobation des Comits nationaux suivant la Rgle des Six Mois en aot 1976.
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The following countries voted explicitly in favour of publication: Australia Austria Belgium Canada Denmark E!ZYPt France Germany H w w Y
Japan Netherlands Poland South Africa (Republic of) Spain Sweden Switzerland Turkey Yugoslavia
The United States National Committee voted against publication of this report because it considered that, for some gases classified in this manner, changes in the maximum experimental safe gap (MESG) and variafions in the degree of pressure enhancement which may occur under pressure piling and turbulent conditions could result in a factor of safety of less than unity under actual conditions.
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1.
2.
2.
MATRIEL LECTRIQUE POUR ATMOSPHRES EXPLOSIVES
Douzime partie: Classement des mlanges de gaz ou de vapeurs et dair suivant leur interstice exprimental maximal de scurit
et leur courant minimal dinflammation
Domaine dapplication
Le prsent rapport donne des directives pour le choix du groupe ou sous-groupe appropri de matriels lectriques protgs par une enveloppe antidflagrante ou conus de faon tre scurit intrinsque, daprs le gaz ou la vapeur,dans lesquels les matriels sont destins tre utiliss.
Le prsent rapport indique les critres de classement des gaz et des vapeurs les plus courants. Des conseils sont donns au sujet des essais excuter pour classer les gaz ou vapeurs non mentionns dans le prsent rapport.
Classement des gaz et vapeurs
Pour les matriels protgs par enveloppes antidflagrantes et scurit intrinsque, on peut classer les gaz et les vapeurs daprs le groupe ou sous-groupe de matriels requis pour utilisation dans une atmosphre particulire de gaz ou de vapeur.
Les principes gnraux appliqus pour tablir les listes de gaz et de vapeurs dans les tableaux sont indiqus ci-aprs.
Classement suivant les interstices exprimentaux maximaux de scurit ( IEMS)
Pour les enveloppes antidflagrantes, les gaz et les vapeurs sont classs suivant leurs interstices exprimentaux maximaux de scurit (IEMS). La dtermination normalise de lIEMS est effectue avec lappareil dcrit dans la Publication 79-1A ; mais, si des dterminations ont t effectues seulement dans une sphre de 8 litres avec inflammation proche du plan du joint, elles peuvent tre admises provisoirement.
Les groupes de matriels lectriques sont: Groupe I: Groupe II:
les limites des IEMS sont: Groupe IIA: IEMS suprieur ou gal 0,9 mm. Groupe IIB: IEMS suprieur 0,5 mm et infrieur 0,9 mm. Groupe IIC: IEMS infrieur ou gal 0,5 mm. Note. - LIEMS est dtermin 20 C ou corrig pour cette temprature.
Classement suivant les courants minimaux dinjlammation (CMI)
utilisation dans les mines (mthane). pour applications dans dautres industries.
Le groupe II de matriels lectriques est subdivis et, dans le but de classer les gaz et les vapeurs,
2.2
Pour la scurit intrinsque, les gaz et les vapeurs sont classs en fonction du rapport de leur courant minimal dinflammation (CMI) celui du mthane de laboratoire. La dtermination normalise de ce rapport CMI est effectue avec lappareil dcrit dans la Publication 79-3; mais, si des dterminations ont t effectues avec dautres appareils, elles peuvent tre admises provi- soirement.
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ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES
Part 1 2 Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps
and minimum igniting currents r
1. Scope
This report provides guidance on the selection of the appropriate group or sub-group of electrical apparatus, protected by flameproof enclosure or designed to be intrinsically safe, according to the gas or vapour in which it is intended to be used.
This report provides the basis for the classification of the most used gases and vapours. Guidance is given on the tests to be carried out to classify any additional gases or vapours not listed in this report.
2. Classification of gases and vapours
For the purposes of flameproof enclosures and intrinsic safety, gases and vapours can be classified according to the group or sub-group of apparatus required for use in the particular gas or vapour atmosphere.
The general principles used to establish the lists of gases and vapours in the tables are given below.
2.1 ClassiJication according to the maximum experimental safe gaps (MESG)
For flameproof enclosures, gases and vapours are classified according to their maximum experi- mental safe gaps (MESG). The standard method for determining MESG shall be the vessel described in Publication 79-1A, but where determinations have been undertaken only in an 8 litre spherical vessel with ignition close to the flange gap these can be accepted provisionally.
The groups of apparatus are: Group I: mining applications (methane). Group II:
the MESG limits are: Group IIA: MESG above or equal to 0.9 m. Group IIB: MESG greater than 0.5 mm and less than 0.9 mm. Group IIC: MESG less than or equal to 0.5 mm. Note. - MESG is determined at, or corrected to, 20 OC.
for applications in other industries.
Group II apparatus is subdivided and, for the purpose of classification of gases and vapours,
2.2 ClassiJication accosding to the minimum igniting currents (MIC)
For intrinsic safety, gases and vapours are classified according to the ratio of their minimum igniting currents (MIC) with that of laboratory methane. The standard method of determining MIC ratios shall be with the apparatus described in Publication 79-3, but where determinations have been undertaken in other apparatus these can be accepted provisionally.
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classer le gaz ou la vapeur.
Groupe IIA: 1IEMS est suprieur 0,9 mm, ou le rapport CMI est suprieur 0,9. Groupe IIB: 1IEMS est compris entre 0,55 mm et 0,9 mm, ou le rapport CMI est compris entre
0,5 et 0,8. Groupe IIC: IIEMS est infrieur
1) Seul le rapport CMI a t dtermin et sa valeur est comprise entre 08 et 09, la dtermination
2) Seul le rapport CMI a t dtermin et sa valeur est comprise entre 0,45 et 0,5, la dtermination
3) Seul 1IEMS a t dtermin et sa valeur est comprise entre 0,5 mm et 0,55 mm, la dtermi-
Une seule dtermination est suEsante lorsque:
05 mm, ou le rapport CMI est infrieur 045.
I1 est ncessaire de dterminer la fois IIEMS et le rapport CMI dans les cas suivants:
de IIEMS est alors ncessaire pour classer le gaz ou la vapeur.
de IIEMS est alors ncessaire pour classer le gaz ou la vapeur.
nation du rapport CMI est alors ncessaire pour classer le gaz ou la vapeur.
2.4 Classement suivant une similitude de striicture chimique Lorsquun gaz ou une vapeur appartient une famille de composs homologues, on peut provi-
soirement dduire le classement de ce gaz ou de cette vapeur en se basant sur les rsultats obtenus pour dautres composs de masse molculaire plus faible, appartenant cette famille. I1 convient de prendre les plus grandes prcautions lorsquil sagit dattribuer le compos un groupe.
Classement de mlanges de gaz
de IIEMS et du rapport CMI.
2.5
Les mlanges de gaz ne sont gnralement attribus un groupe quaprs dtermination spciale .
3. Tableaux des gaz
Le classement prsent dans ce rapport donne des indications sur les groupes de matriels lec- triques utiliser dans un mlange particulier de gaz/air afin dviter les risques dexplosion dorigine lectrique. Il convient de remarquer que certaines des substances numres, comme le nitrate dthyle, sont relativement instables et peuvent se prter une dcomposition spontane.
La liste des gaz et vapeurs de ces tableaux ne vise pas tre exhaustive.
Toutes les formes isomriques des produits classs sont comprises.
La signification des lettres affectes chaque gaz est la suivante: a = classement daprs la valeur de IIEMS. b = classement daprs la valeur du rapport CMI. c = 1IEMS et le rapport CMI ont t dtermins. d = classement en fonction de la similitude de structure chimique (classement provisoire).
,
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The groups of apparatus are: Group I: mining applications (methane). Group II: applications in other industries.
the MIC ratios are: Group IIA: MIC ratio above 0.8. Group IIB: MIC ratio between 0.45 and 0.8. Group IIC MIC ratio below 0.45.
Group II apparatus is subdivided and, for the purpose of classication of gases and vapours,
2.3 ClassiJication according to MESG and MIC
or MIC to classify the gas or vapour. For most gases and vapours it is sufficient to make only one determination of either MESG
One determination is adequate when: Group IIA: the MESG exceeds 0.9 mm, or the MIC ratio exceeds 0.9. Group IIB: the MESG is between 0.55 mm and 0.9 mm, or the MIC ratio is between 0.5 and 0.8.
Group IIC:
i) The MIC ratio determination only has been made, and the ratio is between 0.8.and 0.9, when
2) The MIC ratio determination only has been made, and the ratio is between 0.45 and 0.5, when
3) The MESG only has been found, and is between 0.5 mm and 0.55 111111, when an MIC ratio
the MESG is less than 0.5 mm, or the MIC ratio less than 0.45.
Determination of both the MESG and MIC ratio is required when:
an MESG determination will be required to classify the gas or vapour.
an MESG determination will be required to dassify the gas or vapour.
determination will be required to classify the gas or vapour.
2.4 ClassiJication according to a similarity of chemical structuse
When a gas or vapour is a member of an homologous series of compounds the classification of the gas or vapour can provisionally be inferred from the results of determinations of the other members of the series with lower molecular weights. Care should be taken when such inferences are used in allocating the compound to a group.
2.5 Classification of mixtures of gases
of MESG or MIC ratio. Mixtures of gases should generally be allocated to a group only after a special determination
3. Tables of gases
The classification in this report provides guidance on the group of electrical apparatus to be used in a particular gaslair mixture to avoid the danger of an explosion from an electrical source. It should be noted that some materials listed, for example ethyl nitrate, are relatively unstable and may be prone to spontaneous decomposition.
The list of gases and vapours in the tables should not be considered to be comprehensive. All isomeric forms of the compounds listed are included.
The significance of the letter against each gas is as follows: a = classied according to MESG determination. b = classified according to MIC ratio. c = both MESG and MIC ratio have been determined. d = classied according to similarity of chemical structure (provisional classification).
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~
IEC 79 PT*KL2 78 W 4844871 0080L45 2 = - 10 -
TABLEAU I TABLE I Gaz ou vapeurs pour lesquels un matriel
lectrique du groupe IIA est requis Gases or vapours for which Group IIA
apparatus is required
Gaz ou vapeur
Gas or vapour
1. Hydrocarbures Hydrocarbons
1.1 Alcanes Alkanes
Mthane Methane
Ethane Ethane
Propane
Butane
Pentane
Hexane
Heptane
Octane
Nonane
Dcane Decane
Cyclobutane
Cyclopentane
Cyclohexane
Cycloheptane
. Mthylcyclobutane Methylcyclobutane
Mthylcyclopentane Methylcyclopentane
MBthylcyclohexane . Methylcyclohexane
Ethylcyclobutane Ethylcyclobutane
Ethylcyclopentane Ethylcyclopentane
Ethylcyclohexane Ethylcyclo hexane
Dcahydronaphtalne (dcaline) Decahydronaphthalene (dekalin)
Formule chimique
Chemical formula
CH4
C2H6
CsH8
C4H10
C5H12
CBH14
c7H16
GH18
ClOH22
Mthode de classement
viethod of classification
C
C
C
a
d
a
d
a
C
d
d
d
d
d
d
d
d
Le mthane (CH4) se rapporte un gaz avec impurets ngligeables. I) Methane (CHd refers to a gas with negligible impurities.
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Gaz ou vapeur Gas or vapour
1.2 Alcnes Aikenes
Propne (propylne) Propene (propylene)
1.3 Hydrocarbures aromatiques Aromatic hydrocarbons
Styrne Styrene
Isopropenylbenzene (mthylstyrne) (methylstyrene)
1.4 Hydrocarbures benzniques Benzenoids
Benzne Benzene
Tolune Toluene
Xylne Xylene
Ethylbenzne Ethylbenzene
Trimthylbenzne . Trimethylbenzene
Naphtalne Naphthalene
Cumne Cumene
Cymne Cymene
1.5 Hydrocarbures mlangs Mixed hydrocarbons
Mthane (industriel) l) Methane (industrial) i)
Trbenthine Turpentine
Naphte de ptrole Petroleum naphtha
Naphte de houille Coal tar naphtha
Ptrole (y compris essence de ptrole) Petroleum (including motor spirit)
Solvant ou essence de nettoyagi
Mazout Heating oil
. Solvent or cleaning petroleum
- 11 -
Formule chimique Chemical formula
CBH5CH CH2
Mthode de classement
tethod of classication
a
b .
a
d
d
. d
(calcul) a (calculated
d
d
d
Le mthane (industriel) comprend des mlanges contenant jusqu' 15%, en volume, d'hydrogne. Methane (industrial) includes methane mixtures containing up to 15%, by volume, of hydrogen.
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Gaz ou vapeur Gas or vapour .
Krosne Kerosene
- Gas-oil Diesel oil
Benzol pour moteurs Motor benzole
2. Composs contenant de loxygne Compounds containing oxygen
Oxydes (y compris les thers) Oxides (including ethers)
Monoxyde de carbone Carbon monoxide
Diprop ylther Dipropylether
2.1
2.2 Alcools et phnols
Mthanol Methanol
Ethanol Ethanol
Propanol
Butanol
Pentanol
Alcohols and phenols .
Hexanol
Heptanol
Octano1
Nonanol
Cyclohexanol
Mthylcyclohexanol Methylcyclohexanol
Phnol Phenol
Crsol Cresol
4-hydroxy-4-methylpentan-2-oni (diactone-alcool) (diacetone alcohol)
2.3 Aldhydes Aldehydes
Aldhyde actique Acetaldehyde
Formule chimique Chemical formula
CO
(c3H7>20
CHaOH
C2HbOH
C3H70H
C4HgOH
CbHnOH
C6H130H
C7H160H
C6H170H
C9Hl9OH
CH2(CH2)4CH OH I
CHsCH(CH2)4CH OH
CeHsOH
CH3CeH4OH
(CH&C(OH)CHZCO CH3
. CHsCHO
Mthode de classement Method of classificatior
d
d
a
C
a
C
C
C
d
d
a
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Gaz ou vapeur Gas or vapour
2.4
2.5
2.6
Mtaldhyde Metaldehyde
Ctones Ketones
Actone Acetone
Butanone (thyl-mthyl-ctone) (ethyl methyl ketone)
Pentan-2-one (propyl-mthyl-ctone) (propyl methyl ketone)
Hexan-2-one (but yl-mthyl-ctone) (butyl methyl ketone)
Amyl-mthyl-ctone Amyl methyl ketone
Pentane-2,4-dione (actylactone) (acetylacetone)
Cyclohexanone
Esters
Formiate de mthyle Methyl formate
Formiate d'thyle Ethyl formate
Actate de mthyle Methyl acetate
Actate d'thyle Ethyl acetate
Actate de propyle Propyl acetate
Actate de butyle Butyl acetate
Actate d'amyle Amyl acetate
Mthacrylate de mthyle Methyl methacrylate
Methacrylate d'thyle Ethyl methacrylate
Actate de vinyle Vinyl acetate
Actylactate d'thyle Ethyl acetoacetate
Acides Acids
Acide actique Acetic acid
Formule chimique Chemical formula
G H 5 C 0 CH3
C,H,CO CH3
C4HgCO CH3
C5Hi1CO CH3
CH3CO CH&O CH3
CHa(CHa)4CO
H COO CH3
H COO C2H5
CH3COO CH3
CH3COO C2H5
CH3COO C3H7
CH3COO C4Hg
CH3COO CSHll
CH, = C(CH3)COOCH3
CH2 = C(CH3)COOqH,
CH3COOCH = CH2
CH3COCH2COOC2H5
CH3COOH
Mthode de classement Method of classification
d
C
C
a
a
d
a
a
a
a
C
a
a
C
d
a
d
a
a
b
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IEC 74 P T * 1 2 78 M 4844871 0080147 T M - 14 -
Gaz ou vapeur Gas or vapour
3. Composs contenant des halognes Compounds containing halogens
3.1 Composs sans oxygne
Chloromthane Chloromethane
Chlorothane Chloroethane
Compounds without oxygen
. Bromthane Bromoethane
Chloropropane
Chlorobutane
Bromobutane
Dichlorthane Dichloroethane
Dichloropropane
Chlorobenzne Chlorobenzene
Chlorure de benzyle Benzyl chloride
Dichlorobenzene Dichlorobenzene
Chlorure d'allyle Allyl chloride
Dichlorthylne Dichloroethylene
Chlorure de vinyle Chloroethylene
d,d,d-trifluorotoluene (phenyltrifluoromthane) (bernotrifluoride)
Dichloromethane (chlorure de mthylne) (methylene chloride)
3.2 Composs contenant de l'oxygne Compounds with oxygen
Chlorure d'actyle Acetyl chloride
Chlorthanol Chloroethanol
4. Composs contenant du soufre Compounds containing sulphur
Ethanethiol (Ethyl-mercap tan)
Propane-1 -thiol (Propyl-mercaptan) '
Formule chimique Chemical formula
CH3C1
C2HSCl
C2H5Br
GH7C1
C4HgC1
C4HgBr
C2H4C12
C3H6C12
CoH5Cl
CsHbCH2Cl
c6H4c12
CH2 = CHCHZCI
CHCI= CHCl
CH2 = CHCI
C6H5CF3
CH2C12
CHsCOCl
Mthode de classement Method of classification
a
b
d
a
a
d
a
d
d
d
d
b
a
C
a
d
d
d
C
(calcul) a (calculated
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Gaz ou vapeur
Gas or vapour
5 .
5.1
. Thiophne Thiophene
Ttrahydro thiophene Tetrahydrothiophene
Composs contenant de l'azote Compounds containing nitrogen
Ammoniac Ammonia
Actonitrile Acetonitrile
Nitrite d'thyle . Ethyl nitrite
Nitromthane Nitromethane
Nitrothane Nitroethane
Amines
Mthylamine Methylamine
Dimthylamine Dimethylamine
Trimthylamhe Trimethylamine
Dithylamine Diethylamine
Trithylamhe Triethylamine
Propylamine
Butylamine
Cyclohexylamine
2-aminoethanol (ethanolamine) (mono-ethanolamine)
2-dithylaminothanol 2-diethylaminoethanol
Diaminothane Diaminoethane
Aniline
NN-dimethylaniiine
Amphtamine Amphetamine
Toluidine
Pyridine
Formule chimique Chemical formula
CH=CH CH= CHS
"3
CH&N
CH3CHzONO
CH3NH2
Mthode de classement tethod of classification
a
a
a
a
a
d
d
a
a
a
d
d
d
C
d
d
d
a
d
d
d
d
d
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TABLEAU II TABLE II Gaz ou vapeurs your lesquels un matriel
lectrique du gsoupe IIB est requis Gases or vapours for which Group IIB
apparatus is required
Gaz ou vapeur
Gas or vapour
Hydrocarbures Hydrocarbons
Allylne Prop yne
Ethylene Ethylene
Cyclopropane
1,3-butadine 1,3-butadiene
Composs contenant de lazote Compounds containing nitrogen
Acrylonitrile
Nitrate disopropyle Isopropyl nitrate
Acide cyanhydrique Hydrogen cyanide
Composs contenant de loxygne Compounds containing oxygen
Ether mthylique Dimethyl ether
Ether mthylique dthyle Ethyl methyl ether
Ether thylique Diethyl ether
Ether butylique Dibutyl ether
Oxione (oxyde dthylne) (ethylene oxide) ~.
1,2-poxypropane 1,2-epoxypropane
1,3-dioxolane
1,3,5-trioxane
Butyl glycolate (ester butylique de lacide hydroxyactique) (hydroxyacetic acid, butyl ester)
Formule chimique
Chemical formula
CH& = CH
C2H4
CH2CH2CH2 U
CH2 = CHCH = CH2
CH2 = CHCN
(CH3)2CHON02
HCN
CH2 CH2 O
CH3CHCH20
CH2 CH2 OCH2 O
CH2CH20CH2CH20
CH20 CH20 CH20
Mthode de classement
Method of classincatior
C
b
a
C
C
d
a
b
a
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Gaz ou vapeur Gas or vapour
Alcool ftrahydrofurfurylique Tetrahydrofurfuryl alcohol
Acrylate de mthyle Methyl acrylate
Acrylate d'thyle Ethyl acrylate
Furanne Furan
Aldhyde crotonique Crotonaldehyde
Acr ylaldehyde (acroline) (acrolein)
Ttrahydrofuranne Tetrahydrofuran
Mlanges MiutUres
Gaz de four coke Coke oven gas
Composs contenant des halognes Compounds containing halogens
Ttrafluorthylne Tetrafluoroethylene
l-chloro-2,3-epoxypropane (pichlorohydrine) (epichlorohydrin) .
Hydrogne Hydrogen
Actylne Acetylene
Bisulfure de carbone Carbon disulphide
Nitrate d'thyle Ethyl nitrate
Formule chimique Chemical formula
CHz = CHCOOCH3
CH2 = CHCOOCzH5
CH = CHCH = CHO
~ ~ _ _ _ _
Mthode de classement Method of classification
CHaCH = CHCHO
CHz = CHCHO
cZF4
OCHzCHCH2Cl
d
a
a
a
a
a (calcul) (calculated)
a
d
a
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Autres publications de la CE1 prpares par le Comit dEtudes NO 31
Other IEC publications prepared by Technical Committee No. 31
79 : - Matriel lectrique pour atmosphres explosives. 79-0 (1971) Partie zro: Introduction gnrale. 79-0 (1971) Part O: General introduction.
79-1 (1971) Premire partie: Construction, vrification et 79-1 (1971) Part I: Construction and test of flameproof
79: - Electrical apparatus for explosive gas atmospheres.
essais des enveloppes antidflagrantes de matriel enclosures of electrical apparatus. lectrique.
79-1A (1975) Premier complment: Annexe D; Mthode dessai 79-IA (1975) First supplement: Appendix D: Method of test pour la dtermination de iinterstice expri- for ascertainment of maximum experimental mental maximal de scurit. safe gap.
79-2 (1975) Deuxime partie: Enveloppes surpression 79-2 (1975) Part 2: Pressurized enclosures.
79-3 (1972) Troisime partie: Eclateur pour circuits de 79-3 (1972) Part 3: Spark test apparatus for intrinsically-safe
79-4 (1975) Quatrime partie: Mthode dessai pour la 79-4 (1975) Part 4 Method of test for ignition temperature.
79-4A (1970) Premier complment l. 79-4A (1970) First supp1ement.l
79-5 (1967) Cinquime partie: Protection par remplissage 79-5 (1967) Part 5: Sand-filled apparatus.
79-5A (1969) Premier complment. 79-5A (1969) First supplement.
79-6 (1968) Sixime parfie : Matriel immerg dans lhuile. 79-6 (1968) Part 6: Oil-immersed apparatus.
79-7 (1969) Septime partie: Construction, vrification et 79-7 (1969) Part 7: Construction and test of electrical appar- atus, type of protection e.
79-8 (1969) Part 8: Classification of maximum surface tem-
79-9 (1970) Neuvime partie: Marquage. 79-9 (1970) Part 9: Marking.
79-10 (1972) Dixime partie: Classification des zones dan- 79-10 (1972) Part 10: Classification of hazardous areas.
79-11 (1976)
interne.
scurit intrinsque. circuits.
dtermination de la temprature dinflammation.
pulvrulent.
essais du matriel lectrique en protection