Iec 60297 3 105 2008

Mechanical structures for electronic equipment – Dimensions of mechanical structures of the 482,6 mm 19 in series – Part 3-105: Dimensions and design aspects for 1U high chassis Struct

Chassis type A

This type of chassis is typically lightweight, has limited depth, and features a low cable pull factor, resulting in a center of gravity positioned close to the front panel where it mounts to rack or cabinet uprights Figure 4 demonstrates the recommended chassis dimensions, maximizing the available cabinet aperture for a 1U chassis Both the maximum cable pull factor and weight must be considered to ensure that the mounted chassis's vertical deflection does not exceed the theoretical rack or cabinet height pitch line.

The maximum width as shown in Figure 4 includes any attached mounting flanges as well as mounting screws

Hole dimensions (see IEC 60297-3-100) Front view

Figure 4 – Dimensions of chassis type A

LICENSED TO MECON Limited - RANCHI/BANGALORE FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

Chassis type B

For the type B chassis shown in Figure 5, the chassis height dimension is reduced by 2 mm at the bottom to allow for chassis support space This reduction ensures an interference-free modular mounting system, enabling the installation of multiple or different chassis and subracks within a rack or cabinet.

Where maximum available chassis height is required, only the chassis to mounting support interfaces have to be observed

For safety reasons and for the load bearing calculation of the chassis slides, the total weight shall not exceed 25 kg

Recessed area for corresponding chassis slides

1) The dotted line indicates that the recess may be throughout the whole width

Figure 5 – Dimensions of chassis type B

Chassis type C

For the type C chassis as shown in Figure 6, the chassis width dimension is reduced to provide space for single, double or triple extension telescopic slides

The type C chassis may require cable management between the rear of the chassis and the rack/cabinet interface

The type C chassis dimensions are based on the triple extension telescopic design and the telescopic slides are within the 1U chassis dimension

When fully extended from the rack or cabinet, the type C chassis load must be carefully monitored due to the potential risk of dangerous tilting in a free-standing rack or cabinet The recommended maximum chassis width is 425 mm, which allows for a 2 × 12 mm space to accommodate the extendable parts of the telescopic slides (refer to Clause A.2) Although there is no universal standard for telescopic slides, the suggested 12 mm dimension aligns with the most common products available in the electronics market and corresponds appropriately to the maximum load capacity.

NOTE For safety reasons (tilt effect of a cabinet by fully extended chassis) and for the load bearing calculation of telescopic slides the chassis shall not exceed 25 kg

1) Keep out area for telescopic slides

2) Mounting holes to be defined dependent on telescopic slide chosen

Figure 6 – Dimensions of chassis type C

6 Climatic, mechanical tests (safety aspects, EMC, seismic)

For the test of mechanical integrity, dedicated tests are described in the IEC 61587 series

This standard serves as a common reference for the design properties of 1U equipment in technical specifications Although 1U chassis are not explicitly detailed in the standard, testing for these chassis should be conducted following the guidelines established for subracks.

Chassis and rack/cabinet relationship

A.1 Chassis type B and rack/cabinet relationship

Rack/cabinet envelope dimensions in accordance with IEC 60297-3-100

Rack/cabinet aperture between the 19 in vertical members

Mounting dimensions of the 19 in vertical member in accordance with IEC 60297-3-100

1) Minimum distance of the slide to the 19 in uprights attachment plane

Figure A.1 – Chassis type B and rack/cabinet relationship

A.2 Chassis type C rack/cabinet relationship

Rack/cabinet envelope dimensions in accordance with IEC 60297-3-100

Mounting dimensions of the 19 in vertical member in accordance with IEC 60297-3-100

Telescopic slide mounted to the rack/cabinet structure

Usable space for telescopic slides

1) Chassis type C top and rear I/O access to be defined by the designer and installer defined cable management

Chassis mounted on telescopic slides

Figure A.2 – Chassis type C rack/cabinet relationship

For effective heat management within a cabinet, it is essential that airflow through multiple built-in chassis or subracks moves in the same direction The preferred airflow direction for 1U chassis is from front to rear, ensuring optimal cooling performance Alternatively, side-to-side or side-to-rear airflow can be considered, primarily for stand-alone equipment Maintaining consistent airflow direction helps achieve well-controlled thermal conditions and enhances equipment reliability.

These rules apply for chassis with forced air flow

For effective natural convection cooling, it is essential to allocate space within the cabinet for air inlets and outlets, allowing airflow from bottom to top In both convection and forced air cooling systems, optimal cooling is achieved when air enters through the front of the chassis and exits at the rear, ensuring efficient heat dissipation.

Cooling air can optionally enter and exit the chassis at various points, depending on the chassis type (A, B, C) and the specific application installation The direction of airflow is determined by application-specific standards, specifications, or profiles to ensure optimal performance.

Chassis depth relationship to the rack/cabinet

Table C.1 – Maximum depth D in relation to corresponding cabinet depth

6 Essais climatiques, mécaniques (aspects de sécurité, CEM, sismique) 29

Annexe A (informative) Relation entre les châssis et les bâtis/baies 30

Annexe B (informative) Circulation d’air de refroidissement 32

Annexe C (informative) Profondeur du châssis par rapport à la profondeur de bâti/baie correspondant 33

Figure 4 – Dimensions des châssis de type A 26

Figure 5 – Dimensions des châssis de type B 27

Figure 6 – Dimensions des châssis de type C 28

Figure A.1 – Relation entre les châssis de type B et les bâtis/baies 30

Figure A.2 – Relation entre les châssis de type C et les bâtis/baies 31

Figure B.1 – Circulation d´air de refroidissement 32

Tableau C.1 – Profondeur maximale D par rapport à la profondeur de baie correspondante 33

STRUCTURES MÉCANIQUES POUR ÉQUIPEMENTS ÉLECTRONIQUES –

DE LA SÉRIE 482,6 mm (19 pouces) –

Partie 3-105: Dimensions et aspects de conception pour les châssis d’une hauteur de 1U

The International Electrotechnical Commission (IEC) is a global standardization organization composed of national electrotechnical committees Its mission is to promote international cooperation on standardization in the fields of electricity and electronics To achieve this, the IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS), and Guides These publications are developed by study committees, with participation from any interested national committee and collaboration from international governmental and non-governmental organizations The IEC works closely with the International Organization for Standardization (ISO) under mutually agreed terms to ensure coordinated standardization efforts.

Official decisions or agreements by the IEC on technical matters represent, whenever possible, an international consensus on the topics studied, as the IEC National Committees involved are represented in each study committee.

IEC publications are issued as international recommendations and are approved by the IEC National Committees Every reasonable effort is made to ensure the technical accuracy of IEC publications; however, the IEC cannot be held responsible for any misuse or misinterpretation by end users.

To promote international uniformity, IEC National Committees commit to transparently applying IEC Publications in their national and regional publications whenever possible Any discrepancies between IEC Publications and corresponding national or regional documents must be clearly stated in the latter.

5) La CEI n’a prévu aucune procédure de marquage valant indication d’approbation et n'engage pas sa responsabilité pour les équipements déclarés conformes à une de ses Publications

6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication

No liability shall be attributed to the IEC, its directors, employees, auxiliaries, or agents, including its experts and members of its study committees and National Committees, for any harm caused by bodily injury, material damage, or any other type of direct or indirect damage This also includes any costs (such as legal fees) and expenses arising from the publication or use of this IEC Publication or any other IEC Publication, or from the credit given to it.

8) L'attention est attirée sur les références normatives citées dans cette publication L'utilisation de publications référencées est obligatoire pour une application correcte de la présente publication

Attention is drawn to the fact that some elements of this IEC Publication may be subject to intellectual property rights or similar rights The IEC cannot be held responsible for not identifying such property rights or for failing to indicate their existence.

La Norme internationale CEI 60297-3-105 a été établie par le sous-comité 48D: Structures mécaniques pour équipement électronique, du comité d'études 48 de la CEI: Composants électromécaniques et structures mécaniques pour équipements électroniques

Le texte de cette norme est issu des documents suivants:

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant abouti à l'approbation de cette norme

Cette publication a été rédigée selon les Directives ISO/CEI, Partie 2

Une liste de toutes les parties de la série CEI 60297, présentées sous le titre général

Structures mécaniques pour équipements électroniques – Dimensions des structures mécaniques de la série 482,6 mm (19 pouces), peut être consultée sur le site web de la CEI

The committee has decided that the content of this publication will remain unchanged until the maintenance date specified on the IEC website at "http://webstore.iec.ch" within the data related to the searched publication On that date, the publication will be updated accordingly.

• remplacée par une édition révisée, ou

Electronic systems based on a 1U chassis design have become one of the most important platforms used for servers, industrial electronics, information processing hardware, and telecommunications equipment These 1U chassis are sometimes referred to as "pizza boxes."

Les applications pour les conceptions de châssis de 1U sont largement étendues et des solutions sont trouvées dans chaque segment de l'industrie électronique

La CEI 60297-3-100 définit les détails dimensionnels des bâtis/baies, tels que l’ouverture disponible et les dimensions de montage des panneaux avant Cependant, la CEI 60297-3-

The IEC 100 standard does not provide guidelines or dimensional requirements for assembling 1U design chassis within racks or cabinets compliant with IEC 60297, whether in single or multiple (n × 1U) stacking configurations.

La présente partie de la CEI 60297 donnera un guide et fournira des exigences dimensionnelles pour les châssis de 1U d’après le poids, les dimensions physiques et l’accessibilité en service

Dans la présente norme, divers types de châssis sont identifiés selon les besoins de l'application

The standardized interface dimensions of various chassis types enable the development of common mounting accessories This clarity, combined with selecting the chassis type specific to the application, allows designers to effectively address maintenance and airflow considerations for the chosen 1U chassis.

Châssis de type A

This type of chassis is typically lightweight, with limited depth and/or a very low cable load factor As a result, the center of gravity is relatively close to the front panel of the chassis where the mounting screws for the rack posts are located Figure 4 illustrates the recommended chassis dimensions based on the maximum available bay opening for a 1U chassis It is essential to consider the maximum cable load factor in addition to the maximum weight The vertical deflection of the mounted chassis should not exceed the theoretical pitch line of the rack posts.

La largeur maximale représentée sur la Figure 4 comprend toutes les brides de montage fixées ainsi que les vis de montage

Dimensions manquantes (voir la CEI 60297-3-100)

Ligne de pas de hauteur

Dimensions des trous (voir la CEI 60297-3-100) Vue de face

Figure 4 – Dimensions des châssis de type A

Châssis de type B

For type B frames shown in Figure 5, the frame height must be reduced to provide space for the frame support According to the current standard, the frame height is decreased by 2 mm at the bottom of the frame height.

Ceci fournit une approche de montage modulaire sans interférences de châssis ou bacs multiples et/ou différents dans un bâti / une baie

Lorsque la hauteur de châssis maximale disponible est exigée, seules les interfaces entre le châssis et le support de montage doivent être observées

Pour des raisons de sécurité et pour le calcul de support de charge des glissières du châssis, le poids total ne doit pas dépasser 25 kg

Zone encastrée pour les glissières de châssis correspondantes 1)

La ligne en pointillés indique que le retrait peut se faire sur l’ensemble de la largeur

Dimensions manquantes (voir la CEI 60297-3-100)

Vue de face Vue arrière

Figure 5 – Dimensions des châssis de type B

Châssis de type C

For type C frames shown in Figure 6, the frame width is reduced to accommodate space for single, double, or triple extension telescopic slides.

Les châssis de type C peuvent exiger un système de câblage entre l’arrière du châssis et l’interface bâti/baie

Les dimensions des châssis de type C sont fondées sur la conception télescopique à triple extension et les glissières télescopiques ont une dimension compatible avec le châssis de 1U

The load of type C frames, when fully extended outside the housing or bay, must be considered due to the potential dangerous tipping effect of an unsecured housing or bay The recommended frame width of 425 mm allows for a 2 × 12 mm space for the extendable parts of telescopic slides (see Article A.2) Although there is no standard for telescopic slides, the recommended 12 mm dimension aligns with the most common products in the electronics market and corresponds to the maximum load capacity.

For safety reasons, including the risk of a bay tipping due to a fully extended frame, and to ensure accurate load support calculations for telescopic slides, the frame weight must not exceed 25 kg.

1) Emplacement réservé aux glissières télescopiques

2) Trous de montage à définir en fonction de la glissière télescopique choisie

Dimensions manquantes (voie la CEI 60297-3-100)

Figure 6 – Dimensions des châssis de type C

6 Essais climatiques, mécaniques (aspects de sécurité, CEM, sismique)

Pour l’essai de l’intégrité mécanique, des essais dédiés sont décrits dans la série CEI 61587

This standard should be referenced in technical specifications as a common basis for the design properties of 1U equipment Since 1U chassis are not explicitly described in the aforementioned standard, testing of the chassis should be conducted in accordance with the relevant trays.

Relation entre les châssis et les bâtis/baies

A.1 Relation entre les châssis de type B et les bâtis/baies

Dimensions de l’enveloppe des bâtis/baies conformes à la CEI 60297-3-100

Ouverture des bâtis/baies entre les montants de 19 pouces

Châssis monté sur des glissières

Glissière montée sur le bâti/la baie

1) Distance minimale de la glissière par rapport au plan de fixation des montants de 19 pouces

Dimensions de montage des montants de 19 pouces conformes à la CEI 60297-3-100

Figure A.1 – Relation entre les châssis de type B et les bâtis/baies

A.2 Relation entre les châssis de type C et les bâtis/baies

Dimensions de l’enveloppe des bâtis/baies conformes à la CEI 60297-3-100

Dimensions de montage des montants de 19 pouces conformes à la CEI 60297-3-100

Glissière télescopique montée sur la structure bâti/baie

Espace utilisable pour les glissières télescopiques

1) Accès d’E/S par dessus et l’arrière du châssis de type C à définir par le système de câblage défini par le concepteur

Châssis monté sur des glissières télescopiques

Figure A.2 – Relation entre les châssis de type C et les bâtis/baies

For effective heat management within a rack, it is essential that airflow through multiple integrated chassis or trays moves in the same direction The preferred airflow direction for 1U chassis is from front to back Alternatively, airflow can be directed from one side to the other or from one side to the rear, mainly for standalone equipment These airflow guidelines apply specifically to chassis with forced air circulation.

In natural convection, it is essential to allow sufficient space within the bay for air to enter and exit, enabling vertical airflow circulation During cooling by convection and forced air circulation, the cooling air ideally enters at the front of the chassis and exits at the rear, ensuring efficient thermal management.

Cooling air can potentially enter and exit the chassis at any point, depending on the chassis type (A, B, C) and the final application setup The direction of airflow must be determined by the relevant standards, specifications, and application-specific profiles to ensure optimal performance.

Direction préférentielle de la circulation d’air Montants de bâtis/baies de 19 pouces

Figure B.1 – Circulation d´air de refroidissement

Profondeur du châssis par rapport à la profondeur de bâti/baie correspondant

Tableau C.1 – Profondeur maximale D par rapport à la profondeur de baie correspondante

Tiêu đề	Dimensions and Design Aspects for 1U High Chassis
Thể loại	Standard
Năm xuất bản	2008

Định dạng
Số trang	38
Dung lượng	1,09 MB