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NORME
INTERNATIONALE
INTERNATIONAL
STANDARD

CEI
IEC
721-3-6
1987

AMENDEMENT 1
AMENDMENT

1

1991-06

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FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

Amendement 1
Classification des conditions d'environnement
Troisième partie:
Classification des groupements des agents
d'environnement et de leurs sévérités
Environnement des navires
Amendment 1
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. 1 © 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 1 par la suivante:

1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
5

10

20

50

100


200

500

1 000 2 000
Fréquence Hz
CFI 488/91

Exemple de durées d'une impulsion semi-sinusoidale:
Spectre type I: durée 11 ms
Spectre type II: durée 6 ms
Spectre type III: durée 2,3 ms

Figure 1 - Exemples de spectres types de réponses aux chocs
(spectres de réponses aux chocs maximax de premier ordre).
Les explications se trouvent à la note 6 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 à l'approbation de cet amendement.


-3-

721-3-6 Amend. 1 © 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 1 by the following:

Q.
Yl

E
E

E

0,8
0,6

X

m


0,4

0,2
20

50

100

200

500

1 000

2 000
Frequency Hz
fEC 488!9!

Example of durations for half-sine pulse:
Spectrum type I: duration 11 ms
Spectrum type II: duration 6 ms
Spectrum type III: duration 2,3 ms

Figure 1 - Model shock response spectra
(first order maximax shock response spectra).
For explanation see note 6 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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