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IEC 60297-3-100 Ed. 1.0 b:2008
"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 60297-3-100:2008 specifies the basic dimensions of front panels, subracks, chassis, racks and cabinets of the 482,6 mm (19 in) series. Subsequent standards of the associated IEC 60297-3 series provide detail dimensions for specific parts of the equipment practice, where the basic dimensions are used as interface to other associated parts. "
International Electrotechnical Commission [iec]