Safety system for a power tool, comprising: - said electroportable tool, comprising: - a body, - a machining member and a support member, the machining member and/or the support member being at least partly made of electrically conductive material, - an actuator connected to the machining member, in order to move the machining member relative to the support member, - a first terminal (D1; D2), - a second terminal (D2; D1) electrically connected to the machining member and/or to the support member, - a control module for said power tool, wherein an electrical circuit is arranged to be closed when an impedance element connects the first terminal (D1; D2) with the second terminal (D2; D1), characterized in that - said power tool comprises: - a pad of electrically conductive material, arranged to at least partially surround said body and to be gripped by a first limb of the user, in order to carry and/or operate the power tool, in that said system comprises: - a first transformer, - a second transformer, in that - said first terminal (D1; D2) is electrically connected to the pad, and in that said electrical circuit comprises: - a secondary winding of said first transformer, - a primary winding of said second transformer, - said first terminal (D1; D2), - said second terminal (D2; D1), so that a current induced in the secondary winding of the first transformer by a primary winding of the first transformer via an excitation module connected to said primary winding, flows in said circuit, said control module being arranged to generate an alarm and/or to modify the speed of said actuator, on the basis of a measurement signal induced in a secondary winding of the second transformer by the primary winding of the second transformer. - said electroportable tool, comprising: - a body, - a machining member and a support member, the machining member and/or the support member being at least partly made of electrically conductive material, - an actuator connected to the machining member, in order to move the machining member relative to the support member, - a body, - a machining member and a support member, the machining member and/or the support member being at least partly made of electrically conductive material, - an actuator connected to the machining member, in order to move the machining member relative to the support member, - a first terminal (D1; D2), - a second terminal (D2; D1) electrically connected to the machining member and/or to the support member, - a control module for said power tool, wherein an electrical circuit is arranged to be closed when an impedance element connects the first terminal (D1; D2) with the second terminal (D2; D1), characterized in that - said power tool comprises: - a pad of electrically conductive material, arranged to at least partially surround said body and to be gripped by a first limb of the user, in order to carry and/or operate the power tool, in that - said power tool comprises: - a pad of electrically conductive material, arranged to at least partially surround said body and to be gripped by a first limb of the user, in order to carry and/or operate the power tool, in that - a pad of electrically conductive material, arranged to at least partially surround said body and to be gripped by a first limb of the user, in order to carry and/or operate the power tool, in that said system comprises: - a first transformer, - a second transformer, in that - said first terminal (D1; D2) is electrically connected to the pad, - a first transformer, - a second transformer, in that - said first terminal (D1; D2) is electrically connected to the pad, and in that said electrical circuit comprises: - a secondary winding of said first transformer, - a primary winding of said second transformer, - said first terminal (D1; D2), - said second terminal (D2; D1), - a secondary winding of said first transformer, - a primary winding of said second transformer, - said first terminal (D1; D2), - said second terminal (D2; D1), so that a current induced in the secondary winding of the first transformer by a primary winding of the first transformer via an excitation module connected to said primary winding, flows in said circuit, said control module being arranged to generate an alarm and/or to modify the speed of said actuator, on the basis of a measurement signal induced in a secondary winding of the second transformer by the primary winding of the second transformer.