Applies to electric motor-operated or magnetically driven tools, intended for indoor and for outdoor use, which have all the following characteristics: a) easily moved by one person, simple devices to facilitate transportation may be incorporated, e.g. handles, wheels and the like; b) used in a safe stationary position with or without fixing, e.g. fast clamping devices, bolting and the like; c) used under the control of an operator; d) not intended for continuous production or production line use; e) intended to be connected to electric supply by a flexible cord and a plug; f) maximum rated voltage not exceeding 250 V single-phase, a.c. or d.c., or 440 V three-phase, a.c.; g) maximum rated input not exceeding 2500 W, for single-phase a.c. or d.c., and 4000 W for three-phase a.c.