AS NZS 2344-1997 Amdt 1-2007 Limits of electromagn AS NZS 2344-1997 Amdt 1-2007 Limits of electromagnetic interference from overhead a.c. powerlines and high vo 下载 - 国外标准

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PREFACE

This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee MT-014, Corrosion of Metals, to supersede AS/NZS 2312:1994, Guide to the protection of iron and steel against exterior atmospheric corrosion.

This Standard incorporates Amendment 1 (August 2004). The changes required by the Amendment are indicated in the text by a marginal bar and amendment number against the clause, note, table, figure, or part thereof affected.

The objective of this Standard is to provide guidance for architects, engineers, builders, the surface coating industry and users of protective services in general, on coating systems for the protection of steel work against corrosion. The designer can choose from a selection of systems based on expected service life to first maintenance for various environments. The systems recommended herein are based on good industrial practice and usage; however, local knowledge of any corrosion problem should influence the decisions taken.

Many of the system options will provide equal performance in the field. The system chosen will depend on many factors including location, material supply, available equipment, labour and cost.

It is necessary to refer to each Section of this Standard when a specification for an appropriate system is being prepared.

This edition of the Standard has been expanded to cover non-atmospheric environments in addition to exterior atmospheric environments.

In providing recommendations on up-to-date protection systems, the Committee is aware of the large number of systems used commercially, but, to avoid confusion, has included only a limited range of systems for each type of environment.

The Committee acknowledges the developments which are taking place in the protection of structural steel work and will continue to monitor these in order to make changes to future editions of this Standard as may become necessary.

In preparing this revision, cognizance was taken of the International Standard ISO 9223:1992, Corrosion of metals and alloys—Corrosivity of atmospheres—Classification. Cognizance was also taken of a number of the draft International Standards being prepared to become part of the ISO 12944 series of Standards, Paints and varnishes—Corrosion protection of steel structures by protective paint systems. These Standards were not adopted as most of the paint systems they specify are not used in Australia and New Zealand.

The term 'informative' has been used in this Standard to define the application of the appendix to which it applies. An 'informative' appendix is only for information and guidance.

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STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND

Amendment No. 1

to

AS/NZS 2344:1997

Limits of electromagnetic interference from overhead a.c. powerlines and high voltage equipment installations in the frequency range 0.15 to 1000 MHz

REVISED TEXT

The 1997 edition of AS/NZS 2344 is amended as follows; the amendment(s) should be inserted in the appropriate place(s).

SUMMARY: This Amendment applies to the Preface, Clause 1.2 and Appendix B.

Published on 31 May 2007.

Approved for publication in New Zealand on behalf of the Standards Council of New Zealand on 20 December 2006.

AMDT No. 1 MAY 2007

Page 2 Preface

Delete the last paragraph and replace with the following:

The terms ‘normative’ and ‘informative’ have been used in this Standard to define the application of the appendix to which they apply. A ‘normative’ appendix is an integral part of a Standard, whereas an ‘informative’ appendix is only for information and guidance.

AMDT No. 1 MAY 2007

Page 4 Clause 1.2

Add the following after the first sentence:

The limits herein apply to both the incidental radiation of radio frequencies fortuitously generated by the power system and to radio frequencies borne by the system.

AMDT No. 1 MAY 2007

Page 15 Appendix B

Delete ‘(Informative)’ and replace with ‘(Normative)’.

AMDT No. 1 MAY 2007

Page 16 Paragraph B3

Replace last sentence of the first paragraph of Paragraph B3 with the following:

Preliminary measurements shall be carried out across the band to determine the nature of the radiation from the line. Where the measured disturbances are determined to be solely those generated fortuitously by the components of the line and/or its associated hardware or dominated by these disturbances, measurements need only be carried out at a nominal frequency of 60 MHz. The level of incidental radiation of line borne radio frequencies from sources such as powerline communications and other frequency dependent emissions shall be measured continuously across the band.

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NOTES

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AS/NZS 2312:2002

(Incorporating Amendment No. 1)

Australian/New Zealand Standard™

Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings

Originated as part of MA 1.5—1967.

Previous edition AS/NZS 2312:1994.

Fourth edition 2002.

Reissued incorporating Amendment No. 1 (August 2004)

COPYRIGHT

All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.

Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020

ISBN 0 7337 4887 2

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