International Electrotechnical Commission

Modular order for the development of mechanical structures for electronic equipment practices - Part 2: Sectional specification - Interface co-ordination dimensions for the 25 mm equipment practice - Edition 1.0
 N 60917-2

Annotation

This part of IEC 917 may be applied to all fields of electronics in which equipment and installations with a modular design are used.

The object of this part of IEC 917 is to define a sectional specification for the mechanical structure of a 25 mm equipment practice to provide for dimensional compatibility at mechanical interfaces with related engineering applications, e.g. plug-in units, printed boards, components, instrumentation, furniture, rooms, buildings, etc.

It specifies the co-ordination dimensions and pitches for cabinets, racks, subracks and chassis of all types used for electronic equipment in, for example industrial electronics, information technology, measurement and control systems and communications.

The chosen co-ordination dimensions for the mechanical structure for heights, widths and depths, lie within a homogeneous, metric modular three-dimensional grid as specified in IEC 917. In this part of IEC 917, the mounting pitches 25 mm and 2,5 mm have been used as a base to determine the interface co-ordination dimensions for the electronic equipment practice.

This creates the optimum conditions for the application of computer-aided methods throughout design and manufacture such as, for instance, computer-aided planning, development, manufacturing, testing and installation.

The cabinets and racks in this part of IEC 917 represent a specific structural form which takes into consideration for instance the installation of subracks and chassis.