Appliance (200;500) comprising: - at least one electrode, called measurement electrode, polarized at an alternating electrical potential (V G), called detection electrical potential, different from a ground potential, at a frequency, called detection frequency, in order to detect at least one object in a detection zone, and - at least one capacitive detection electronics, connected to said measurement electrodes, in order to detect a signal with respect to a capacitive coupling between said object and said measurement electrode or at least one of said measurement electrodes; characterized in that said appliance (200;500) also comprises: - an electric line, comprising at least one electric wire, in said detection zone; - at least one spacing means (204;302;402) for distancing said electric line in order to position it at a distance from the at least one measurement electrode comprised between: ▪ a distance (D min), called minimum distance, corresponding to the distance beyond which an electric line, called reference electric line, with a predetermined dimension, generates a coupling capacitance with the at least one measurement electrode, less than a predetermined threshold capacitance; and ▪ a distance (D max), called maximum distance, corresponding to the distance beyond which an object, called reference object, with a predetermined dimension, greater than the dimension of said reference electric line, generates a coupling capacitance with the at least one measurement electrode, less than said threshold capacitance. - at least one electrode, called measurement electrode, polarized at an alternating electrical potential (V G), called detection electrical potential, different from a ground potential, at a frequency, called detection frequency, in order to detect at least one object in a detection zone, and - at least one capacitive detection electronics, connected to said measurement electrodes, in order to detect a signal with respect to a capacitive coupling between said object and said measurement electrode or at least one of said measurement electrodes; - an electric line, comprising at least one electric wire, in said detection zone; - at least one spacing means (204;302;402) for distancing said electric line in order to position it at a distance from the at least one measurement electrode comprised between: ▪ a distance (D min), called minimum distance, corresponding to the distance beyond which an electric line, called reference electric line, with a predetermined dimension, generates a coupling capacitance with the at least one measurement electrode, less than a predetermined threshold capacitance; and ▪ a distance (D max), called maximum distance, corresponding to the distance beyond which an object, called reference object, with a predetermined dimension, greater than the dimension of said reference electric line, generates a coupling capacitance with the at least one measurement electrode, less than said threshold capacitance. ▪ a distance (D min), called minimum distance, corresponding to the distance beyond which an electric line, called reference electric line, with a predetermined dimension, generates a coupling capacitance with the at least one measurement electrode, less than a predetermined threshold capacitance; and ▪ a distance (D max), called maximum distance, corresponding to the distance beyond which an object, called reference object, with a predetermined dimension, greater than the dimension of said reference electric line, generates a coupling capacitance with the at least one measurement electrode, less than said threshold capacitance.