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Iec 60721 3 6 1987 amd1 1991 scan

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IEC• NORME CEI INTERNATIONALE IEC INTERNATIONAL 721 3 6 STANDARD 1987 AMENDEMENT 1 AMENDMENT 1 1991 06 Amendement 1 Classification des conditions d''''environnement Troisième partie Classification des gr[.]

NORME INTERNATIONALE INTERNATIONAL STANDARD CEI IEC 721-3-6 1987 AMENDEMENT AMENDMENT 1991-06 LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU Amendement Classification des conditions d'environnement Troisième partie: Classification des groupements des agents d'environnement et de leurs sévérités Environnement des navires Amendment Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities Ship environment © CEI 1991 Droits de reproduction réservés — Copyright — all rights reserved Bureau Central de la Commission Electrotechnique Inte rn ationale 3, rue de Varembé Genève, Suisse IEC• Commission Electrotechnique Internationale International Electrotechnical Commission Mew,ayHapoaHaa 3neKrpoTexHHYecKaa HoMHCCHa CODE PRIX PRICE CODE B Pour prix, voir catalogue en vigueur For price, see outrent catalogue - 721-3-6 amend © CEI 2- PRÉFACE Le présent amendement a été établi par le Comité d'Etudes n° 75 de la CEI: Classification des conditions d'environnement Le texte de cet amendement est issu des documents suivants: DIS Rapport de vote 75(BC)63 75(BC)67 Page 18 Remplacer la figure par la suivante: 1,8 1,6 1,4 1,2 1,0 0,8 0,6 0,4 0,2 10 20 50 100 200 500 000 000 Fréquence Hz CFI 488/91 Exemple de durées d'une impulsion semi-sinusoidale: Spectre type I: durée 11 ms Spectre type II: durée ms Spectre type III: durée 2,3 ms Figure - Exemples de spectres types de réponses aux chocs (spectres de réponses aux chocs maximax de premier ordre) Les explications se trouvent la note relative au tableau I de la CEI 721-1 (1990) LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant abouti l'approbation de cet amendement -3- 721-3-6 Amend © IEC PREFACE This amendment has been prepared by IEC Technical Committee No 75: Classification of environmental conditions The text of this amendment is based on the following documents: DIS Report on Voting 75(CO)63 75(CO)67 Page 19 Replace figure by the following: Q Yl E E E 0,8 0,6 X m 0,4 0,2 20 50 100 200 500 000 000 Frequency Hz fEC 488!9! Example of durations for half-sine pulse: Spectrum type I: duration 11 ms Spectrum type II: duration ms Spectrum type III: duration 2,3 ms Figure - Model shock response spectra (first order maximax shock response spectra) For explanation see note relating to table I of IEC 721-1 (1990) Imprimé en Suisse Printed in Switzerland LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU Full information on the voting for the approval of this amendment can be found in the Voting Report indicated in the above table LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU ICS 19.040 Typeset and printed by the IEC Central Office GENEVA, SWITZERLAND

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