1、UDC621.316.36L89GB中华人民共和国国家标准GB/T3047.2-92高度进制为44.45mm的面板、机架和机柜的基本尺寸系列Series of basic dimensions of panels,racks andenclosures for vertical increment of 44.45 mm1992-10-04发布1993-06-01实施国家枝术监督局发布GB/T3047.2-924面板（见图2图4）B图2图3图44.1宽度B的尺寸系列482.6、609.6、762.0mm4.2高度H的尺寸系列见表1。表1mm代HhsnU图号士0.41U43.65.9c22088
2、.137.71U43.65.931.82U88.15.976.2一3U132.537.757.15一40177.037.7101.65U221.537.7146.16U265.937.7190.56U265.937.757.1576.27U310.337.788.957.158U354.837.7101.676.29U399.237.7101.6120.610U443.737.7101.6165.111U488.137.7133.3146.112U532.637.7133.3190.6注：表1中：=44.45mm:H=#U-0.8mm,当结构设计需要增加不足1U的面板高度时，允许在H值上增加1/2U,但hh,h不变.4.3安装槽口或安装孔的尺寸见图5。图5所示的安装槽口和安装孔是典型的，也允许采用其它孔型，或不开槽口。2
