scope:

This standard covers the basic dimensions of a modular range of subracks for mounting in equipment according to IEC Publication 297, together with the basic dimensions of a compatible of plug-in units and printed boards. This standard covers also the connector-dependent dimensions to be used when two-part connectors types according to IEC Publication 603-2 are mounted on subracks and plug-in units. It specifies also the standard positions of free connectors such that plug-in units are mechanically interchangeable in subracks with corresponding fixed connector positions. Subsequent appendices will give the dimensions of associated plug-in units using suitable connectors standardized or to be standardized by the IEC, together with applicable detail dimensions of the subracks. This standard should be used in conjunction with the following IEC publications: Publications Nos. 249-2 (1970):Base Materials for Printed Circuits, Part 2:Specifications.