A door for enclosed electric sw i tchboards disposed to co-operate with a substantially plane door frame (12) is box-shaped having an intact front plate (1) and four side walls (5) at right angles thereto. The side walls are all, for optional positioning of hinging and locking elements, provided at regular intervals with blanks (4) to be punched out when utilised. To prevent water and dust from penetrating into the switchboards the frame (12) is provided with a gasket or a sealing strip (P) which is mounted in a small recess (17) on the frame. The side walls (5) are partly bent inwardly so that the outermost edge (13) thereof, in the closed position of the door, compresses the gasket (P) linearly and centrally thereof.