EN IEC 62610-6:2020

Mechanical structures for electrical and electronic equipment - Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series - Part 6: Air recirculation and bypass of indoor cabinets

IEC 62610-6:2020 deals with thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series, provides compatible measurement methods of recirculation ratio and bypass ratio which are indicators for defining quality of airflow in the forced air cooling that can be commonly applied to indoor cabinets for mounting subrack and/or chassis-based equipment. This document contains the following: a) the definition of recirculation and bypass flow rates in the cooling of the cabinet, b) the levels of the recirculation ratio RC, c) the definition of the formula for the recirculation ratio RCs of forced air cooling subrack and/or chassis-based equipment installed in the cabinet, d) the definition formula of recirculation ratio RCr and bypass rate BPr of the entire cabinet, e) the requirements of the measuring method of each temperature necessary for calculating the recirculation ratio RCs, RCr and bypass ratio BPr. The purpose of this document is to provide: • for the equipment integrator and development designer of the cabinet the criteria for efficiently and correctly determining the specification, and • for the supplier of the cabinet the measuring and classifying method for the airflow recirculation rate of the subrack and/or chassis-based equipment installed in the cabinet.

Mechanische Bauweisen für elektrische und elektronische Einrichtungen - Wärmemanagement für Schränke nach den Reihen IEC 60297 und IEC 60917 - Teil 6: Luftrezirkulation und Verlustluftstrom von Innenschränken

Structures mécaniques pour équipements électriques et électroniques - Gestion thermique pour les armoires conformes aux séries IEC 60297 et IEC 60917 - Partie 6 : Recyclage et dérivation de l'air des armoires intérieures

IEC 62610-6:2020 traite de la gestion thermique pour les armoires conformément aux séries CEI 60297 et CEI 60917, fournit des méthodes de mesure compatibles du taux de recirculation et du taux de dérivation qui sont des indicateurs pour définir la qualité du flux d'air dans le refroidissement à air forcé qui peuvent être couramment appliquées aux armoires intérieures pour le montage des bacs et / ou des équipements sur châssis. Ce document contient les éléments suivants: a) la définition des débits de recirculation et de dérivation dans le refroidissement de l'armoire, b) les niveaux du taux de recirculation RC, c) la définition de la formule du taux de recirculation RCs du bac de refroidissement à air forcé et / ou des équipements sur châssis installés dans l'armoire, d) la formule de définition du taux de recirculation RCr et du taux de dérivation BPr de l'ensemble de l'armoire, e) les exigences de la méthode de mesure de chaque température nécessaire au calcul du taux de recirculation RCs, RCr et du taux de contournement BPr. Le but de ce document est de fournir: • pour l'intégrateur d'équipement et le concepteur de développement de l'armoire les critères pour déterminer efficacement et correctement la spécification, et • pour le fournisseur de l'armoire, la méthode de mesure et de classification du taux de recirculation du flux d'air d

Mehanske strukture za električno in elektronsko opremo - Uravnavanje toplote v omaricah v skladu s skupinama standardov IEC 60297 in IEC 60917 - 6. del: Recirkulacija zraka in obvod notranjih omaric (IEC 62610-6:2020)

General Information

• Status: Published
• Publication Date: 14-May-2020
• ICS: 31.240 - Mechanical structures for electronic equipment
• Technical Committee: CLC/SR 48D - Mechanical structures for electronic equipment
• Drafting Committee: IEC/SC 48D - IEC_SC_48D
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 15-May-2020
• Completion Date: 15-May-2020
• Ref Project: SIST EN IEC 62610-6:2020 - Mechanical structures for electrical and electronic equipment - Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 Series - Part 6: Air recirculation and bypass of indoor cabinets (IEC 62610-6:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2020
Mehanske strukture za električno in elektronsko opremo - Uravnavanje toplote v
omaricah v skladu s skupinama standardov IEC 60297 in IEC 60917 - 6. del:
Recirkulacija zraka in obvod notranjih omaric (IEC 62610-6:2020)
Mechanical structures for electrical and electronic equipment - Thermal management for
cabinets in accordance with IEC 60297 and IEC 60917 Series - Part 6: Air recirculation
and bypass of indoor cabinets (IEC 62610-6:2020)
Mechanische Bauweisen für elektrische und elektronische Einrichtungen -
Wärmemanagement für Schränke nach den Reihen IEC 60297 und IEC 60917 - Teil 6:
Luftrezirkulation und Verlustluftstrom von Innenschränken (IEC 62610-6:2020)
Structures mécaniques pour équipements électriques et électroniques - Gestion
thermique pour les armoires conformes aux séries IEC 60297 et IEC 60917 - Partie 6 :
Recyclage et dérivation de l'air des armoires intérieures (IEC 62610-6:2020)
Ta slovenski standard je istoveten z: EN IEC 62610-6:2020
ICS:
31.240 Mehanske konstrukcije za Mechanical structures for
elektronsko opremo electronic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62610-6

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 31.240
English Version
Mechanical structures for electrical and electronic equipment -
Thermal management for cabinets in accordance with IEC
60297 and IEC 60917 series - Part 6: Air recirculation and
bypass of indoor cabinets
(IEC 62610-6:2020)
Structures mécaniques pour équipements électriques et Mechanische Bauweisen für elektrische und elektronische
électroniques - Gestion thermique pour les armoires Einrichtungen - Wärmemanagement für Schränke nach den
conformes aux séries IEC 60297 et IEC 60917 - Partie 6 : Reihen IEC 60297 und IEC 60917 - Teil 6: Luftrezirkulation
Recyclage et dérivation de l'air des armoires intérieures und Verlustluftstrom von Innenschränken
(IEC 62610-6:2020) (IEC 62610-6:2020)
This European Standard was approved by CENELEC on 2020-04-29. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62610-6:2020 E

European foreword
The text of document 48D/700/CDV, future edition 1 of IEC 62610-6, prepared by SC 48D
"Mechanical structures for electrical and electronic equipment" of IEC/TC 48 "Electrical connectors
and mechanical structures for electrical and electronic equipment" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 62610-6:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-01-29
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-29
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62610-6:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60297-3-101 NOTE Harmonized as EN 60297-3-101
IEC 60917-2-1 NOTE Harmonized as EN 60917-2-1
IEC 60917-2-2 NOTE Harmonized as EN 60917-2-2
IEC 62610-2 NOTE Harmonized as EN IEC 62610-2
IEC 62610-5 NOTE Harmonized as EN 62610-5

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60297-3-100 - Mechanical structures for electronic EN 60297-3-100 -
equipment - Dimensions of mechanical
structures of the 482,6 mm (19 in) series -
Part 3-100: Basic dimensions of front
panels, subracks, chassis, racks and
cabinets
IEC 60917-1 - Modular order for the development of EN IEC 60917-1 -
mechanical structures for electrical and
electronic equipment practices - Part 1:
Generic standard
IEC 62610-6 ®
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
Mechanical structures for electrical and electronic equipment – Thermal

management for cabinets in accordance with IEC 60297 and IEC 60917 series –

Part 6: Air recirculation and bypass of indoor cabinets

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.240 ISBN 978-2-8322-8006-5

– 2 – IEC 62610-6:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Recirculation level . 8
5 Determination of recirculation and bypass ratio . 9
5.1 Cooling airflow in a cabinet . 9
5.2 Recirculation ratio of a subrack . 10
5.3 Recirculation ratio of a cabinet . 11
5.4 Bypass ratio of a cabinet . 11
6 Measurement of recirculation and bypass . 11
6.1 Measurement of recirculation of a subrack . 11
6.2 Measurement of recirculation of a cabinet . 12
6.3 Measurement of bypass of a cabinet . 12
6.4 Measurement methods of temperature . 12
6.4.1 Intake air temperature of a subrack . 12
6.4.2 Intake air temperature of a subrack group . 13
6.4.3 Exhaust air temperature of a subrack . 13
6.4.4 Exhaust air temperature of a subrack group . 13
6.4.5 Intake air temperature of a cabinet . 13
6.4.6 Exhaust air temperature of a cabinet . 13
6.5 Measurement method of recirculation for an empty cabinet . 14
Annex A (normative) Measurement method of recirculation with dummy thermal loads . 15
A.1 Purpose . 15
A.2 Specifications . 15
A.2.1 DTL . 15
A.2.2 Cabinet specifications . 15
A.2.3 Measurement configurations . 16
A.3 Environmental conditions . 16
A.4 Measurement positions . 16
A.4.1 Intake air temperature of DTL . 16
A.4.2 Exhaust air temperature of DTL . 16
A.4.3 Intake air temperature of a cabinet . 16
A.4.4 Exhaust air temperature of a cabinet . 16
A.4.5 Evaluation of recirculation ratio of a subrack . 16
A.4.6 Evaluation of recirculation and bypass ratio of a cabinet . 16
A.5 Case study . 16
A.6 Relationship between recirculation ratio and intake temperature rise . 19
Annex B (normative) Derivation of recirculation and bypass in a cabinet . 21
B.1 General . 21
B.2 Derivation of recirculation and bypass . 21
Annex C (informative) Application of recirculation and bypass to outdoor cabinets . 22
C.1 General . 22
C.2 Application example . 22
Bibliography . 24

IEC 62610-6:2020 © IEC 2020 – 3 –
Figure 1 – Airflow in a cabinet . 9
Figure 2 – Diagram of cabinet airflows . 10
Figure A.1 – Outline drawings of DTL . 17
Figure A.2 – Experimental setup of a cabinet and DTL . 17
Figure A.3 – Measurement points of intake air temperature of DTL . 18
Figure A.4 – Measurement points of exhaust air temperature of DTL . 18
Figure A.5 – Measurement points of intake air temperature of a cabinet . 18
Figure A.6 – Measurement points of exhaust air temperature of a cabinet . 18
Figure A.7 – Recirculation ratio vs intake air temperature rise. 20
Figure C.1 – Outdoor cabinet airflow schematic . 23
Figure C.2 – Airflow diagram and air temperature in outdoor cabinet . 23

Table 1 – Recirculation level . 9
Table A.1 – Specifications of DTL . 15
Table A.2 – Specifications of DTL . 17
Table A.3 – Test result . 19
Table A.4 – Recirculation and bypass ratio of a cabinet . 19
Table C.1 – A case st
...