A monitoring system (40) of the state of a first mobile element with respect to a second element and intended to rub against the second element, including: - a transformer (50) for electrically isolating a measuring circuit (30), of the earth voltage of a detection circuit (20), -, the detection circuit, this circuit comprising, in addition to a winding (22) of the transformer, a detection element (25, 25 ', 3) intended to be installed in or on the first element, said detection element being arranged so that the current flowing through this detection element is then a function of the state of the strip, this detection circuit having its mass to the potential of the second element, - the measuring circuit comprising the other winding (31) of the transformer and an ac generator, - of the measuring means (33) of the voltage across the terminals of the winding of the electrical measuring circuit.
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