1、NORME?CE1INTERNATIONALE?IECINTERNATIONAL?721-2-6STANDARD?Premire ditionFirst edition1990-12Classification des conditions denvironnementPartie 2:Conditions denvironnement prsentes dans lanature-Vibrations et chocs sismiquesClassification of environmental conditionsPart 2:Environmental conditions appe
2、aring in nature-Earthquake vibration and shockIECNumro de rfrenceReference numberCEI/IEC 721-2-6:1990LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Validit de la prsente publicationLe contenu technique des publications de la CEI est c
3、ons-tamment revu par la CEI afin quil reflte ltat actuel dela technique.Des renseignements relatifs la date de reconfirmation dela publication sont disponibles auprs du Bureau Central dela CEI.Les renseignements relatifs ces rvisions,ltablis-sement des ditions rvises et aux amendements peuventtre ob
4、tenus auprs des Comits nationaux de la CEI etdans les documents ci-dessous:Bulletin de la CEIAnnuaire de la CEIPubli annuellementCatalogue des publications de la CEIPubli annuellement et mis jour rgulirementTerminologieEn ce qui concerne la terminologie gnrale,le lecteur sereportera la CEI 50:Vocabu
5、laire Electrotechnique Inter-national(VEI),qui se prsente sous forme de chapitresspars traitant chacun dun sujet dfini.Des dtailscomplets sur le VEI peuvent tre obtenus sur demande.Voir galement le dictionnaire multilingue de la CEI.Les termes et dfinitions figurant dans la prsente publi-cation ont
6、t soit tirs du VEI,soit spcifiquementapprouvs aux fins de cette publication.Symboles graphiques et littrauxPour les symboles graphiques,les symboles littraux et lessignes dusage gnral approuvs par la CEI,le lecteurconsultera:la CEI 27:Symboles littraux utiliser enlectro-technique;la CEI 417:Symboles
7、 graphiques utilisablessur le matriel.Index,relev et compilation desfeuilles individuelles;la CEI 617:Symboles graphiques pour schmas;et pour les appareils lectromdicaux,la CEI 878:Symboles graphiques pourquipements lectriques en pratique mdicale.Les symboles et signes contenus dans la prsente publi
8、-cation ont t soit tirs de la CEI 27,de la CEI 417,de laCEI 617 et/ou de la CEI 878,soit spcifiquement approuvsaux fins de cette publication.Publications de la CEI tablies par lemme comit dtudesLattention du lecteur est attire sur les listes figurant la finde cette publication,qui numrent les public
9、ations de laCEI prpares par le comit dtudes qui a tabli laprsente publication.Validity of this publicationThe technical content of IEC publications is kept underconstant review by the IEC,thus ensuring that the contentreflects current technology.Information relating to the date of the reconfirmation
10、 of thepublication is available from the IEC Central Office.Information on the revision work,the issue of revisededitions and amendments may be obtained from IECNational Committees and from the following IECsources:IEC BulletinIEC YearbookPublished yearlyCatalogue of IEC publicationsPublished yearly
11、 with regular updatesTerminologyFor general terminology,readers are referred to IEC 50:International Electrotechnical Vocabulary(IEV),which isissued in the form of separate chapters each dealingwith a specific field.Full details of the IEV will besupplied on request.See also the IEC MultilingualDict
12、ionary.The terms and definitions contained in the present publi-cation have either been taken from the IEV or have beenspecifically approved for the purpose of this publication.Graphical and letter symbolsFor graphical symbols,and letter symbols and signsapproved by the IEC for general use,readers a
13、re referred topublications:I EC 27:Letter symbols to be used in electricaltechnology;IEC 417:Graphical symbols for use onequipment.Index,survey and compilation of thesingle sheets;I EC 617:Graphical symbols for diagrams;and for medical electrical equipment,I EC 878:Graphical symbols for electromedic
14、alequipment in medical practice.The symbols and signs contained in the present publicationhave either been taken from IEC 27,IEC 417,IEC 617and/or IEC 878,or have been specifically approved for thepurpose of this publication.IEC publications prepared by the sametechnical committeeThe attention of re
15、aders is drawn to the end pages of thispublication which list the IEC publications issued by thetechnical committee which has prepared the presentpublication.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.NORMEINTERNATIONALEINTERNATIO
16、NALSTANDARDCEII EC721-2-6Premire ditionFirst edition1990-12Classification des conditions denvironnementPartie 2:Conditions denvironnement prsentes dans lanature Vibrations et chocs sismiquesClassification of environmental conditionsPart 2:Environmental conditions appearing in nature Earthquake vibration and shock CEI 1990 Droits de reproduction rservs Copyright all rights reservedAucune partie de cette publication ne peut hm reproduite niutilise sous quelque tomme que ce soft et par aucun pro-cd
