BS EN 60297-3-108:2015 BSI Standards Publication Mechanical structures for electronic equipment — Dimensions of mechanical structures of the 482,6 mm (19 in) series Part 3-108: Dimensions of R-type subracks and plug-in units BRITISH STANDARD BS EN 60297-3-108:2015 National foreword This British Standard is the UK implementation of EN 60297-3-108:2015 It is identical to IEC 60297-3-108:2014 The UK participation in its preparation was entrusted to Technical Committee EPL/48, Electromechanical components and mechanical structures for electronic equipment A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2015 Published by BSI Standards Limited 2015 ISBN 978 580 72854 ICS 31.240 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2015 Amendments/corrigenda issued since publication Date Text affected BS EN 60297-3-108:2015 EUROPEAN STANDARD EN 60297-3-108 NORME EUROPÉENNE EUROPÄISCHE NORM January 2015 ICS 31.240 English Version Mechanical structures for electronic equipment - Dimensions of mechanical structures of the 482,6 mm (19 in) series - Part 3108: Dimensions of R-type subracks and plug-in units (IEC 60297-3-108:2014) Structures mécaniques pour équipements électroniques Dimensions des structures mécaniques de la série 482,6 mm (19 pouces) - Partie 3-108: dimensions des bacs de type r et des blocs enfichables (IEC 60297-3-108:2014) Bauweisen für elektronische Einrichtungen - Maße der 482,6-mm-(19-in-)Bauweise - Teil 3-108: Maße von Baugruppenträgern und steckbaren Baugruppen Typ R (IEC 60297-3-108:2014) This European Standard was approved by CENELEC on 2014-10-14 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels © 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 60297-3-108:2015 E BS EN 60297-3-108:2015 EN 60297-3-108:2015 -2- Foreword The text of document 48D/565/FDIS, future edition of IEC 60297-3-108, prepared by SC 48D, "Mechanical structures for electronic equipment", of IEC TC 48, "Electromechanical components and mechanical structures for electronic equipment" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60297-3-108:2015 The following dates are fixed: • • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the document have to be withdrawn (dop) 2014-07-16 (dow) 2017-10-14 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights Endorsement notice The text of the International Standard IEC 60297-3-108:2014 was approved by CENELEC as a European Standard without any modification -3- BS EN 60297-3-108:2015 EN 60297-3-108:2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies NOTE When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies NOTE Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu Publication IEC 60297-3-100 Year - IEC 60297-3-101 - IEC 60297-3-105 - IEC 61587-1 - IEC 61587-3 - IEC 61587-5 - IEC/TS 62610-2 - Title EN/HD 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 Mechanical structures for electronic EN 60297-3-101 equipment - Dimensions of mechanical structures of the 482,6 mm (19 in) series -Part 3-101: Subracks and associated plug-in units Mechanical structures for electronic EN 60297-3-105 equipment - Dimensions of mechanical structures of the 482,6 mm (19 in) series -Part 3-105: Dimensions and design aspects for 1U high chassis Mechanical structures for electronic EN 61587-1 equipment - Tests for IEC 60917 and IEC 60297 series Part 1: Environmental requirements, test set-up and safety aspects for cabinets, racks, subracks and chassis under indoor conditions Mechanical structures for electronic EN 61587-3 equipment - Tests for IEC 60917 and IEC 60297 Part 3: Electromagnetic shielding performance tests for cabinets, racks and subracks Mechanical structures for electronic EN 61587-5 equipment - Tests for IEC 60917 and IEC 60297 Part 5: Seismic tests for chassis, subracks, and plug-in units Mechanical structures for electronic equipment - Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series - Part 2: Design guide: Method for the determination of forced aircooling structure Year - - - - - - - –2– BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 CONTENTS INTRODUCTION Scope Normative references Terms and definitions Arrangement overview RA – type subrack 5.1 General 5.2 RA–type subrack rear mounting dimensions 11 RB–type subrack 12 6.1 General 12 6.2 RB–type subrack rear mounting dimensions 13 R–type subrack guide rails 13 Electromagnetic shielding provisions and mounting flanges 14 Chassis integrated subrack 15 9.1 General 15 9.2 RA– C–type chassis/subrack 16 9.3 RB–C–type chassis/subrack 16 10 Front panel/plug-in unit compatible with RA – type subrack 17 11 Front panel/plug-in unit compatible with RB – type subrack 19 12 Injector/extractor handle 20 13 Printed board dimensions 20 14 Dimensions 21 15 Nomenclature 22 15.1 Reference plane (given in square boxes of figures) 22 15.2 Dimensions of Table 22 Annex A (normative) Mounting support 23 A.1 Chassis/subrack mounting support in cabinets 23 Annex B (normative) Environmental tests 24 B.1 B.2 B.3 Annex C Static and dynamic load test 24 Seismic test 24 Electromagnetic shielding performance test 24 (normative) Thermal management 25 C.1 Air ducting 25 Annex D (informative) Comparison of IEC 60297-3-101 with IEC 60297-3-108 26 Figure – Subrack application Figure – Arrangement of a R-type subrack and plug-in units Figure – RA–type subrack front mounting dimensions 10 Figure – RA–type subrack rear mounting dimensions 11 Figure – RB–type subrack front mounting dimensions 12 Figure – RB–type subrack rear mounting dimensions 13 Figure – R–type subrack guide rails 14 BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 –3– Figure – R–type subrack front attachment plane and mounting flanges 15 Figure – RA – C type chassis/subrack 16 Figure 10 – RB–C – type chassis/subrack 17 Figure 11 – Front panel/ plug-in unit compatible with RA – type subrack 18 Figure 12 – Front panel/ plug-in unit compatible with RB – type subrack 19 Figure 13 – Injector/extractor handle 20 Figure 14 – Printed board dimensions 21 Figure A.1 – Subrack/chassis mounting support 23 Figure C.1 – Thermal management example 25 Table – Dimensions 21 Table D.1 – Comparison of dimensions and features 26 BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 –6– INTRODUCTION The purpose of this standard is to establish alternative dimensions and features for subracks and associated plug-in units, compared with IEC 60297-3-101 These alternatives allow more sturdy designs for the load bearing members of the subrack In addition, the plug-in units are with alignment pins and fastened with M3 screws Chassis integrated subracks are also part of this standard The main differing dimensions/features compared with IEC 60297-3-101 are: a) The subrack height aperture is decreased in order to increase the dimension for the top and bottom members (most critical load bearing parts) b) Incorporated alignment between the subrack and the plug-in units Injecting and extracting provisions for plug-in units c) The mounting flanges of the subracks are recessable This feature meets the mounting requirements of heavy subracks and allows the positioning to the centre of gravity d) Chassis integrated subracks for optimized thermal management features Subrack and plug-in unit mechanical complexity factor High e) Comparison of dimensions and features with IEC 60297-3-101 is shown in appendix D, Table D.1 For an application image of the subrack based on this standard see Figure IEC 60297-3-101 Conventional form factor and normal weight, for small to medium volume applications, e.g general industrial computing and data processing IEC 60297-3-108 Heavy weight and large form factor, for large volume applications, e.g cloudcomputing servers, telecom servers Low IEC 60297-3-107 Small form factor and light weight, for large volume applications, e.g embedded systems, mobile/ubiquitous computing systems Embedded system Full scaled 19 in system Heavy duty 19 in system Subrack and plug-in unit system weight factor IEC Figure – Subrack application BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 –7– MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT – DIMENSIONS OF MECHANICAL STRUCTURES OF THE 482,6 mm (19 in) SERIES – Part 3-108: Dimensions of R-type subracks and plug-in units Scope This part of IEC 60297 provides dimensions and features for R-type subracks and plug-in units, i.e ruggedized variants of the mechanical structures of the 482,6 mm (19 in) series, with enhanced vibration and shock resistance and/or improved EMC performance, for use in more harsh environment This leads to a subrack standard which is externally compatible with IEC 60297-3-100 but internally largely incompatible with IEC 60297-3-101 R-type subracks, chassis integrated subracks and plug-in units incorporate dimensions and features which provide for a higher level of ruggedness, compared with IEC 60297-3-101 (test set-up and load definitions are selected from IEC 61587-1 and IEC 61587-5) Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies IEC 60297-3-100, Mechanical structures for electronic 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 60297-3-101, Mechanical structures for electronic equipment – Dimensions of mechanical structures of the 482,6 mm (19 in) series – Part 3-101: Subracks and associated plug-in units IEC 60297-3-105, 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 IEC 61587-1, Mechanical structures for electronic equipment – Tests for IEC 60917 and IEC 60297 series – Part 1: Environmental requirements, test set-up and safety aspects for cabinets, racks, subracks and chassis under indoor conditions IEC 61587-3, Mechanical structures for electronic equipment – Tests for IEC 60917 and IEC60297 – Part 3: Electromagnetic shielding performance tests for cabinets and subracks IEC 61587-5, Mechanical structures for electronic equipment – Tests for IEC 60917 and IEC 60297 – Part 5: Seismic tests for chassis, subracks, and plug-in units IEC TS 62610-2, Mechanical structures for electronic equipment – Thermal management for cabinets in accordance with IEC 60297 and IEC 60917 series – Part 2: Design guide: Method for determination of forced air-cooling structure –8– BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 Terms and definitions For the purposes of this document the following terms and definitions apply 3.1 R–type subrack and plug–in unit ruggedized subrack and plug-in unit, with enhanced shock and vibration resistance, with or without EMC provisions compared with subrack/plug-in units according to IEC 60297-3-101 3.2 chassis integrated subrack subrack integrated within the envelope of a chassis Arrangement overview Figure illustrates the typical arrangement of a R-type subrack with the associated plug-in units – 14 – BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 3,0 + 0/-0,2 Front view Dimensions in millimetres, tolerances are non-cumulative E 3) Cross-section E - E F ≥ 13 ,0 ≥ 30 ° 30 ± 2) 10 ± 1,0 1) D2 D 1) 2) 2,8 ± 0,1 3,0 + 0/-0,2 E E First pitch line IEC Key Dimension D and D depend on printed board depth and connector type Position of an optional ESD contact, connecting both sides of the printed board (ESD = Electrostatic discharge) First guide rail on left Figure – R–type subrack guide rails Electromagnetic shielding provisions and mounting flanges Figure illustrates the subrack front mounting plane with the conductive areas for the attachment of front panels and the vertical connection at the left and right side panels The electromagnetic shielding provisions (EMC: Electromagnetic Compatibility) at the rear of the subrack may be resolved by backplanes and/or user defined covers For EMC shielding performance test see IEC 61587-3 The mounting flanges may be recessed by n × 25 mm BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 15 – Dimensions in millimetres, tolerances are non-cumulative Front view Missing dimensions, see IEC 60297-3-101 Conductive surface F F 482,6 ± 0,4 Top view Cross-section F - F First pitch line n x 5,08 Conductive surface ≥ 10,0 EMC gasket C 5,0 ± 0,5 Uncompressed gasket 0,5 mm max 1,3 mm 0,3 ± 0,1 Detail “C“ (n x 25) Mounting flanges may be recessed by n x 25 mm IEC Figure – R–type subrack front attachment plane and mounting flanges 9.1 Chassis integrated subrack General Chassis integrated subracks are common for electronic equipment where air ducting, cooling devices or space for cabling are incorporated into one mechanical unit – 16 – 9.2 BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 RA– C–type chassis/subrack The RA–C type chassis/subrack, in which RA – type subrack is integrated, defines the chassis dimensions (see Figure 9) Dimensions in millimetres, tolerances are non-cumulative First pitch line (4,27) n x 44,45 = U H1 U – (3,0 + 0,5/-0) 1) Front view 2) IEC Key Chassis height reduced for the mounting of chassis supports (see Annex A) First guide rail position (see Figure 2) Figure – RA – C type chassis/subrack 9.3 RB–C–type chassis/subrack The RB–C–type chassis/subrack, in which RB–type subrack is integrated, defines the chassis dimensions (see Figure 10) The subrack may be placed asymmetrically within the chassis dimensions For chassis overall dimensioning see IEC 60297-3-105 (plus n × 1U) BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 17 – First pitch line (6,81) n x 44,45 = U H1 U – (3,0 + 0/-0,5) 1) Front view 2) IEC Key Chassis height reduced for the mounting of chassis supports (see Annex A) First guide rail position (see Figure 4) Figure 10 – RB–C – type chassis/subrack 10 Front panel/plug-in unit compatible with RA – type subrack Figure 11 illustrates the frontpanel/plug-in unit compatible with RA–type subrack and the position of a printed board BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 18 – Front view G 2) 2,9 ± 0,1 Cross-section H - H 11,0 -± 0,2 Ø3 ± 0,05 ≤ 1,0 ≤ 1,0 5,0 ± 0,5 10,0 ± 0,2 Alignment pin ≤ 13,5 max fastened ≤ 0,0 unfastened H H ≤ 2,5 H6 H8 Optional EMC gasket 6,35 ± 0,1 1,0 ± 0,1 M3 Uncompressed gasket 0,5 mm max 1,3 mm 11,0 -± 0,2 2) 13,97 ± 0,1 (0,15) Pitch line Connector user defined Printed board component side Conductive surface Printed board component side (0,67) 1) 20,32 Cross-section G - G 7,0 ± 0,1 12,5 ± 0,2 (optional) H5 -2,35 ± 0,2 Top view 6,0 ± 0,1 G 1) 19,72 ± 0,1 Optional cover H5 -8,35 ± 0,1 2) 2) 10.82 ± 0,1 Dimensions in millimetres, tolerances are non-cumulative M 2,5 (4,07) 9,7 ± 0,1 3) Pitch line 13,97 ± 0,1 6,0 ± 0,1 (optional) 4,0 ± 0,1 (0,15) 1) 18,72 ± 0,1 Alternative front panel design IEC Key May be increased by n x 5,08 mm Optional cut outs if injector/extractor handles are used Retention screw float +/- 0,5 mm Figure 11 – Front panel/ plug-in unit compatible with RA – type subrack BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 19 – 11 Front panel/plug-in unit compatible with RB – type subrack Figure 12 illustrates the frontpanel/plug-in unit compatible with RB–type subrack and the position of a printed board Front view 2) 2) Cross-section K - K 11,0 ± 0,2 ≤ 1,0 ≤ 1,0 10,0 ± 0,2 Optional EMC gasket 6,35 ± 0,1 Alignment pin ≤ 13,5 H6 H8 J Ø3 ± 0,05 5,0 ± 0,5 2,9 ± 0,1 2) 10,82 ± 0,1 Dimensions in millimetres, tolerances are non-cumulative K ≤ 2,5 max fastened ≤ 0,0 unfastened 1,0 ± 0,1 M3 Uncompressed gasket 0,5 max 1,3 K 13,97 ± 0,1 11,0 ± 0,2 2) (0,15) 6,0 ± 0,1 J Pitch line Top view Connector user defined Printed board component side 1) Cross-section J - J 12,5 ± 0,2 (optional) H5 -8,35 ± 0,1 H5 -2,35 ± 0,2 Conductive surface Optional cover Pitch line 20,32 (0,67) 7,0 ± 0,1 Printed board component side (6,61) 1) 19,72 ± 0,1 M 2,5 3) 7,16 ± 0,1 6,0 ± 0,1 (optional) 4,0 ± 0,1 13,97 ± 0,1 (0,15) 1) 18,72 ± 0,1 Alternative frontpanel design IEC Key May be increased by n x 5,08 mm Optional cut outs if injector/extractor handles are used Retention screw float +/- 0,5 mm Figure 12 – Front panel/ plug-in unit compatible with RB – type subrack BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 20 – 12 Injector/extractor handle Figure 13 illustrates the injector/extractor handle The max single handle lever dimension is due to connector forces of max 350 N Handle lever for higher connector forces shall be agreed between supplier and user The minimal travel of the handle for extraction/insertion shall be 7,5 mm Even if the handle may be with a self-locking function, the reliable fastening of front panels shall be resolved by screws M3 As shown in Figure 13, the handle lever direction may be vertical or horizontal Side view Injector/extractor handle position within the subrack max 40 max 40 Alternative handle lever design, horizontal (13,5) G Dimensions in millimetres, tolerances are non-cumulative (2,0) Front view G 11,0 ± 0,5 Side view Handle details Max 3,0 Retention screw 2,0 ± 0,1 2,0 ± 0,1 6,5 ± 0,1 Ø2,0 9,0 ± 0,1 10,0 ± 0,1 Pivot point 15,0 ± 0,2 Ø4,0 Ø4,0 5,0 ± 0,1 (0,36) 18,0 ± 0,2 Pitch line IEC Figure 13 – Injector/extractor handle 13 Printed board dimensions Figure 14 illustrates the printed board dimensions BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 21 – Dimensions in millimetres, tolerances are non-cumulative D3 ≥3,5 ≥7,5 ≥7,5 Optional Optional holes holes Ø 2,7 1) ≥3,5 1) 1) ≥13,5 2) ≥7,5 Ø 2,7 ± 0,1 H 10 -8,0 ± 0,1 (4,0) H 10 1) 6,0 ± 0,1 1) 1) 3,6 ± 0,1 IEC Key Keep out area for frontpanel attachment and components Printed board thickness 1,4 – 2,6 mm Figure 14 – Printed board dimensions 14 Dimensions Table contains the dimensions of subracks and plug-in units Table – Dimensions Dimensions in millimetres Height units U H1 H5 H6 H8 H10 (n × 44,45) ± 0,4 ± 0,2 ± 0,2 ± 0,2 + 0/- 0,3 132,55 100,35 113,55 119,55 100,00 177,00 144,80 158,00 164,00 144,45 221,45 189,25 202,45 208,45 188,90 265,90 233,70 246,90 252,90 233,35 310,35 278,15 291,35 297,35 277,80 354,80 322,60 335,80 341,80 322,25 399,25 367,05 380,25 386,25 366,70 3U (133,35) 4U (177,80) 5U (222,25) 6U (266,70) 7U (311,15) 8U (355,60) 9U (400,05) NOTE The dimensions H1 and H10 comply with IEC 60297-3-101 – 22 – BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 15 Nomenclature 15.1 Reference plane (given in square boxes of figures) A First pitch line B Last pitch line C Left side plate D Right side plate E Front attachment plane F Rear attachment plane G Subrack height aperture H Position of receptacle holes for M3 I Position of alignment pin receptacle hole J Guide rail reference line for printed boards and two part connectors 15.2 Dimensions of Table Height U: Coordination height unit of 44,45 mm (1,75 in) See IEC 60297-3-100 H1: Subrack heights (equal to dimension E of IEC 60297-3-100) H5: Subrack vertical aperture for plug-in units H6: Mounting centre distance for front plug-in units and panels, front and rear H8: Plug-in unit panel height H10: Printed board height into subrack guidance height Width HP: The subrack aperture is theoretically divided into n × horizontal pitches (HP) of 5,08 mm The plug-in unit front panel width is divided into n × 5,08 mm horizontal pitches Depth D1: Subrack dimension between front attachment plane and backplane attachment plane BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 23 – Annex A (normative) Mounting support A.1 Chassis/subrack mounting support in cabinets Figure A.1 illustrates the mounting of a chassis with integrated subrack into a cabinet using mounting supports for heavy load and/or in case of dynamic stress U–3,0+0,5/-0 Example of a chassis with integrated subrack (see Figures and 9) max 2,0 Chassis mounting support fixed to the cabinet uprights (see IEC 60297-3-100) IEC Figure A.1 – Subrack/chassis mounting support – 24 – BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 Annex B (normative) Environmental tests B.1 Static and dynamic load test For the proof of mechanical integrity the chassis/subrack loaded with plug-in units should be tested in accordance with IEC 61587-1 (static load, vibration and shock) B.2 Seismic test In case of seismic requirements the chassis/subrack loaded with plug-in units should be tested in accordance with IEC 61587-5 (resistance of the mechanical structure against seismic impact) B.3 Electromagnetic shielding performance test In case of EMC requirements (electromagnetic compatibility) the chassis/subrack and plug-in units should be tested in accordance with IEC 61587-3 (shielding performance level of the mechanical design) BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 – 25 – Annex C (normative) Thermal management C.1 Air ducting Figure C.1 illustrates a chassis with integrated subrack The air ducting shall be from the front inlet 2), distributed across the depth, vertical up through the subrack 1) and out at the rear 3) The lower and upper compartments are adding to the height dimension of the subrack n × U, dependent on the air volume or for the accommodation of fans The air ducting from front to rear is the preferred solution in accordance with IEC TS 62610-2 3) Air out 1) 2) Air in Key 1) Subrack with plug-in units 2) Compartment with louvered front for air inlet 3) Compartment with louvered rear for air outlet Figure C.1 – Thermal management example IEC – 26 – BS EN 60297-3-108:2015 IEC 60297-3-108:2014 © IEC 2014 Annex D (informative) Comparison of IEC 60297-3-101 with IEC 60297-3-108 Table D.1 – Comparison of dimensions and features Comparative points IEC 60297-3-101 Subrack Subrack dimensions (mm) IEC 60297-3-108 Subrack R-type Compatible with IEC 60297-3-101 Incompatible with IEC 60297-3-101 H1: Subrack heights n × 44,45 – 0,80 Yes – H5: Subrack vertical aperture opening for plug-in units n × 44,45 – 21,35 – n × 44,45 – 33,00 H6: Mounting centre distance for plug-in units, front panels, backplanes and connector supports n × 44,45 – 10,85 – n × 44,45 -19,80 H8: Plug-in unit front panel height n × 44,45 – 4,80 – n × 44,45 – 13,80 H10: Printed board height or plug-in unit into subrack guidance height n × 44,45 – 33,35 Yes – n × 5,08 Yes – Yes – M 2,5 – M3 Auxiliaries according to IEC 60297-3-103 – Yes Front panels for plug-in units – Yes Positions of fixing holes for front panel – Yes Printed board mounting to front panel, vertical 88,90 + n × 44,45 - H 10 – 8,0 Printed board mounting to front panel, 2,54 + 3,57 = 6,11 - 4,0 – Yes Auxiliaries according to IEC 60297-3-102 – Yes May be recessed by n × 25 mm (Rear mount supports can be arranged) – Subrack aperture definitions (HP) Subrack depth (D1 – D4, RD1, RD3 and RD4) Other subrack features Fixing screws for plug-in units, front panels, backplanes and connector supports Alignment pins for plug-in units horizontal EMC provisions Injector/extractor handle for plug-in units Subrack mounting flanges _ This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY 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