An electricity meter, arranged to measure electrical energy supplied by a source, the electricity meter comprising: · at least one input terminal (Ui), each input terminal being arranged to be connected to the source by a respective wire (Ci); · at least one voltage sensor and at least one current sensor arranged to act from inside the electricity meter to take voltage measurements to evaluate a source voltage (Vphi) supplied by the source, and current measurements for evaluating a source current (Iphi) supplied by the source; · a processor unit arranged: o to acquire the voltage measurements and the current measurements, and to detect at least one predefined sequence comprising a first period during which the source current is less than a first predefined current threshold, and a second period during which the source current is greater than a second predefined current threshold that is itself greater than the first predefined current threshold; o for each predefined sequence, to acquire at least one first voltage measurement during the first period and at least one second voltage measurement during the second period; o to detect faulty clamping between at least one wire and the input terminal that is connected to said wire when, during at least one predefined sequence, at least one detection value representative of a difference between a first voltage measurement and a second voltage measurement is greater than or equal to a voltage threshold. · at least one input terminal (Ui), each input terminal being arranged to be connected to the source by a respective wire (Ci); · at least one voltage sensor and at least one current sensor arranged to act from inside the electricity meter to take voltage measurements to evaluate a source voltage (Vphi) supplied by the source, and current measurements for evaluating a source current (Iphi) supplied by the source; · a processor unit arranged: o to acquire the voltage measurements and the current measurements, and to detect at least one predefined sequence comprising a first period during which the source current is less than a first predefined current threshold, and a second period during which the source current is greater than a second predefined current threshold that is itself greater than the first predefined current threshold; o for each predefined sequence, to acquire at least one first voltage measurement during the first period and at least one second voltage measurement during the second period; o to detect faulty clamping between at least one wire and the input terminal that is connected to said wire when, during at least one predefined sequence, at least one detection value representative of a difference between a first voltage measurement and a second voltage measurement is greater than or equal to a voltage threshold. o to acquire the voltage measurements and the current measurements, and to detect at least one predefined sequence comprising a first period during which the source current is less than a first predefined current threshold, and a second period during which the source current is greater than a second predefined current threshold that is itself greater than the first predefined current threshold; o for each predefined sequence, to acquire at least one first voltage measurement during the first period and at least one second voltage measurement during the second period; o to detect faulty clamping between at least one wire and the input terminal that is connected to said wire when, during at least one predefined sequence, at least one detection value representative of a difference between a first voltage measurement and a second voltage measurement is greater than or equal to a voltage threshold.