涉及各种带水平轴的旋转电机，以及三种特定类型的底座安装中的任何一种，即:底座朝下的机器、底座朝上的机器，以及床板为整体部件的机器，以及带有安装法兰的机器，其底脚型的轴高度在355 mm和1000 mm之间，固定孔的节圆直径在180 mm和2360 mm之间。

Relates to all kinds of rotating electrical machines with a horizontal shaft, and any one of three specific types of foot mounting - i.e. machines with feet down, machines with feet up, and machines for which the bed-plate is an integral part - and with mounting flange for which the shaft height in the feet down version is between 355 mm and 1 000 mm and pitch circle diameter of fixing holes between 1 180 and 2 360 mm.