BS EN BRITISH STANDARD 60917:1992 IEC 917:1988 Incorporating Amendment No. 1 Modular order for the development of mechanical structures for electronic equipment practices The European Standard EN 60917 has the status of a British Standard BSi BS EN 60917:1992 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries. Austria Italy Belgium Luxembourg Denmark Netherlands Norway Finland France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom This British Standard, having been prepared under the direction of the Electronic Components Standards Policy Committee, was published opy: undertheauthority of the Standards Board and comes 8 into effect on 1April 1992 Amendments issued since publication Licensed CBSI 12-1999 Amd. No. Date Comments The following BSI references March 1995 Indicated by a sideline in the margin 8568 relate to the work on this standard: Committee reference ECL/21 Special announcementin BSI News November 1991 ISBN 0 580 20591 6 BS EN 60917:1992 Contents Page Cooperating organizations Inside front cover ) BSI National foreword ii Foreword 2 1 Introduction 3 2 Scope 3 3 Object 3 4 Terms and definitions 4 5 Fundamentals 4 6 Modular order details 4 7 Application of the modular order 9 Appendix A Suggested implementation of the modular order 13 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back cover Figure 1 - Modular grid 5 Partitioning of co-ordination dimension Co, same Figure 2 - 6 mounting pitch mp Figure 3 - Partitioning of co-ordination dimension Co, with different mounting pitches mpi and mp2 7 Figure 4 - Different pitches p with different mounting pitches mpv and mph, grid overlay: 0.5 * 2.5 8 Figure 5 - Examples of axis and boundary references to a two-dimensional grid 10 Figure 6 - Examples of axis and boundary references to a 11 three-dimensional grid Figure 7 - Examples of the application of the modular order. For pitches p (presented in the frames ) and co-ordination 12 dimensions C, see Clause 6 Table I - Co-ordination dimensions C 6 CBSI 12-1999 1