A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation

IEC TR 60890:2022 is available as IEC TR 60890:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC TR 60890:2022 specifies a method of air temperature-rise calculation inside enclosures for low-voltage switchgear and controlgear assemblies or similar products in accordance with their respective standard. The method is primarily applicable to enclosed assemblies or partitioned sections of assemblies without forced ventilation. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- alignment with IEC 61439-1:2020;
- addition of individual annexes for guidance of technical explanations related to:
--- effect of an uneven power distribution;
--- additional temperature-rise due to solar radiation;
--- effect of different enclosure materials;
--- effect of different natural ventilation management;
--- forced ventilation management;
--- power losses calculation;
--- impact of an adjacent wall can have on the assembly cooling surface(s);
- maximum internal ambient temperature limit into an assembly;
- validity area of the calculation extended from 3 150 A to 3 200 A;
- addition of an algebraic equation to the different curves included in the document.

Méthode de vérification par calcul des échauffements pour les ensembles d'appareillages à basse tension

IEC TR 60890:2022 est disponible sous forme de IEC TR 60890:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC TR 60890:2022 spécifie une méthode de calcul des échauffements de l'air à l'intérieur d'une enveloppe pour les ensembles d'appareillages à basse tension ou produits analogues selon leur norme respective.
La méthode s'applique principalement aux ensembles sous enveloppe ou aux sections compartimentées des ensembles sans ventilation forcée.
Cette troisième édition annule et remplace la deuxième édition parue en 2014. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
alignement sur l'IEC 61439-1:2020;
ajout d'annexes spécifiques qui contiennent à titre de recommandations des explications techniques concernant:  
l'effet d'une répartition de puissance non uniforme;
l'échauffement supplémentaire dû au rayonnement solaire;
l'effet des différents matériaux d'enveloppe;
l'effet des différents moyens de gestion par ventilation naturelle;
la gestion par ventilation forcée;
le calcul des puissances dissipées;
l'impact que peut avoir une paroi adjacente sur la ou les surfaces de refroidissement de l'ensemble;  
ajout d'une limite maximale pour la température ambiante interne d'un ensemble;
extension du domaine de validité du calcul de 3 150 A à 3 200 A;
ajout d'une équation algébrique pour les différentes courbes incluses dans le document.  La présente version bilingue (2023-01) correspond à la version anglaise monolingue publiée en 2022-09.
La version française de cette norme n'a pas été soumise au vote.

General Information

Status
Published
Publication Date
28-Sep-2022
Current Stage
PPUB - Publication issued
Start Date
03-Nov-2022
Completion Date
29-Sep-2022
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IEC TR 60890
®

Edition 3.0 2022-09
TECHNICAL
REPORT

colour
inside


A method of temperature-rise verification of low-voltage switchgear and
controlgear assemblies by calculation

IEC TR 60890:2022-09(en)

---------------------- Page: 1 ----------------------
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IEC TR 60890

®


Edition 3.0 2022-09




TECHNICAL



REPORT









colour

inside










A method of temperature-rise verification of low-voltage switchgear and

controlgear assemblies by calculation



























INTERNATIONAL

ELECTROTECHNICAL


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ICS 29.130.20 ISBN 978-2-8322-5762-3




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® Registered trademark of the International Electrotechnical Commission

---------------------- Page: 3 ----------------------
– 2 – IEC TR 60890:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Verification conditions . 9
5 Calculation method . 9
5.1 Assumptions made in this calculation . 9
5.2 Necessary information . 10
5.3 Calculation procedure . 10
5.3.1 General . 10
5.3.2 Determination of the effective cooling surface A of the enclosure . 10
e
5.3.3 Determination of the internal temperature-rise ∆t of the air at mid-
0,5
height of the enclo
...

IEC TR 60890
®

Edition 3.0 2022-09
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside


A method of temperature-rise verification of low-voltage switchgear and
controlgear assemblies by calculation

Méthode de vérification par calcul des échauffements pour les ensembles
d'appareillages à basse tension

IEC TR 60890:2022-09(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2022 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland

About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.


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