EARTHING DEVICE AND ROTATING ELECTRIC MACHINE INCLUDING THE DEVICE

In an electric machine including a core of one or more electric conductors (1) surrounded by insulating layers, comprising an inner semiconducting layer (2), an intermediate insulating layer (3) and an outer semiconducting layer (4), the outer semiconducting layer (4) is electrically connected to the earth reference (10) of the machine. For this purpose the outer semiconducting layer (4) is surrounded by a sheet metal earthing plate (5) which is clamped firmly around the outer semiconducting layer (4) by at least one earthing screw (7) and is in electrically conducting contact therewith. The sheet metal earthing plate (5) is electrically connected via an earth wire (8), preferably connected to the earthing screw (7), to said earth reference (10). In a stator winding to a high-voltage generator each winding part is provided with at least one sheet metal earthing plate (5), the sheet metal earthing plates in the various winding parts being electrically connected in series to the earth reference (10).