標準號：BS EN 60917-2-2-1997
中文標準名稱：研制電子設備機械構件用模塊排序.25mm設備的接口配合尺寸分規范.第2節:輔助框架、底盤、底板、面板及插入件
英文標準名稱：Modular order for the development of mechanical structures for electronic equipment practices - Sectional specification - Interface co-ordination dimensions for the 25 mm equipment practice - Detail specification - Dimensions for subracks, chassis, backpl
標準類型：L94
發布日期：1997/4/15 12:00:00
實施日期：1997/4/15 12:00:00
中國標準分類號：L94
國際標準分類號：31.190
適用范圍：This section of IEC 917-2 is a detail specification which is to be used in whole or in part in all fields of electronics where devices and systems are designed according to the sectional specification IEC 917-2. The purpose of this publication is the specification of dimensions which will ensure mechanical interchangeability of subracks, chassis, plug-in units, backplanes and front panels. The sectional specification IEC 917-2 has embodied within it a number of subrack systems based on 25 mm three-dimensional modularity and the binary additive principle for subrack heights. The dimensions in the tables of this detail specification are based on one of the subrack systems taken from the sectional specification IEC 917-2. However, all subrack systems within the sectional specification are valid in this detail specification, provided the relation-ship between the dimensions is maintained, i.e. the dimensional difference between the co-ordination dimensions Hs, Ws and Ds and dimensions Hs0, etc.; Ws0, etc., and Ds0, etc., shown in tables 1.2 and 3 are to be maintained. The subrack dimensions are related to certain cabinet/rack dimensions, see IEC 917-2-1. The front panel dimensions are related to the mounting dimensions of certain cabinets and racks, see IEC 917-2-1. Plug-in units are mounted in subracks. They serve as supports for electrical, electronic and mechanical components. The electrical connection between plug-in units and subracks is based on the use of connectors. All dimensions are given in millimetres and the drawings are first angle projections.