Voltage sensing coupling plug for sensing an elevated voltage of a high-voltage or medium-voltage separable connector in a power network of a national grid, the voltage sensing coupling plug comprising a plug body and a voltage sensor (10, 11), wherein the plug body comprises i) an insulating housing forming a first elongated space for accommodating the voltage sensor (10, 11) and a second elongated space, extending orthogonally to the first elongated space, ii) a conductive contact piece, at least partially arranged in the second elongated space, for mechanical and electrical connection to a contact element on elevated voltage of the separable connector, and iii) a mating portion protruding from the second elongated space and shaped suitably to be mated with the separable connector; and wherein the voltage sensor (10, 11) comprises a voltage divider for sensing the elevated voltage of the contact piece, the voltage divider comprising - a high-voltage contact electrically and mechanically connected to the contact piece, - a low-voltage contact for connection to ground, and - a plurality of discrete impedance elements, electrically connected in series between the high-voltage contact and the low-voltage contact, for dividing the elevated voltage of the contact piece and providing a signal voltage varying proportionally with the elevated voltage, wherein at least a portion of the voltage divider is accommodated in the first elongated space, characterized in that the plug body is adapted to receive and insulate an end of a high-voltage or medium-voltage power cable. wherein the plug body comprises i) an insulating housing forming a first elongated space for accommodating the voltage sensor (10, 11) and a second elongated space, extending orthogonally to the first elongated space, ii) a conductive contact piece, at least partially arranged in the second elongated space, for mechanical and electrical connection to a contact element on elevated voltage of the separable connector, and iii) a mating portion protruding from the second elongated space and shaped suitably to be mated with the separable connector; i) an insulating housing forming a first elongated space for accommodating the voltage sensor (10, 11) and a second elongated space, extending orthogonally to the first elongated space, ii) a conductive contact piece, at least partially arranged in the second elongated space, for mechanical and electrical connection to a contact element on elevated voltage of the separable connector, and iii) a mating portion protruding from the second elongated space and shaped suitably to be mated with the separable connector; and wherein the voltage sensor (10, 11) comprises a voltage divider for sensing the elevated voltage of the contact piece, the voltage divider comprising - a high-voltage contact electrically and mechanically connected to the contact piece, - a low-voltage contact for connection to ground, and - a plurality of discrete impedance elements, electrically connected in series between the high-voltage contact and the low-voltage contact, for dividing the elevated voltage of the contact piece and providing a signal voltage varying proportionally with the elevated voltage, - a high-voltage contact electrically and mechanically connected to the contact piece, - a low-voltage contact for connection to ground, and - a plurality of discrete impedance elements, electrically connected in series between the high-voltage contact and the low-voltage contact, for dividing the elevated voltage of the contact piece and providing a signal voltage varying proportionally with the elevated voltage, wherein at least a portion of the voltage divider is accommodated in the first elongated space, characterized in that the plug body is adapted to receive and insulate an end of a high-voltage or medium-voltage power cable.