A method for locating an electrical arc fault upstream or downstream of an electrical protection device, said device being connected, upstream, to a first energy supply line linked to, at least, one electrical energy source and, downstream, to a second energy supply line linked to, at least, a first electrical load, the electrical energy source supplying a supply current to the first electrical load, wherein said method comprises the following phases: - the measurement of several electrical quantities linked to the supply current, - the confirmation of the presence of the arc fault, and - the signaling of an arc fault downstream of the electrical protection device, and: - the transition between the measurement of several electrical quantities and the confirmation of the presence of the arc fault is conditional on the detection of a simultaneous variation of at least two electrical quantities linked to the supply current, and - the transition between the confirmation of the presence of the arc fault and the signaling of a downstream arc fault is conditional on the determination of the position of the arc fault downstream of the electrical protection device, the method characterized in that the phase of measurement of several electrical quantities linked to the supply current comprises the following steps: - the measurement of a first electrical quantity (MES_AC_W) linked to the supply current in a low frequency band and over a first period, - the measurement of a second electrical quantity (MES_AC_A) linked to the supply current in the low frequency band and over a second period, and - the measurement of a third electrical quantity (MES_HF) linked to the supply current in a high frequency band and over a third period. - the measurement of several electrical quantities linked to the supply current, - the confirmation of the presence of the arc fault, and - the signaling of an arc fault downstream of the electrical protection device, and: - the transition between the measurement of several electrical quantities and the confirmation of the presence of the arc fault is conditional on the detection of a simultaneous variation of at least two electrical quantities linked to the supply current, and - the transition between the confirmation of the presence of the arc fault and the signaling of a downstream arc fault is conditional on the determination of the position of the arc fault downstream of the electrical protection device, the method characterized in that the phase of measurement of several electrical quantities linked to the supply current comprises the following steps: - the measurement of a first electrical quantity (MES_AC_W) linked to the supply current in a low frequency band and over a first period, - the measurement of a second electrical quantity (MES_AC_A) linked to the supply current in the low frequency band and over a second period, and - the measurement of a third electrical quantity (MES_HF) linked to the supply current in a high frequency band and over a third period. - the transition between the measurement of several electrical quantities and the confirmation of the presence of the arc fault is conditional on the detection of a simultaneous variation of at least two electrical quantities linked to the supply current, and - the transition between the confirmation of the presence of the arc fault and the signaling of a downstream arc fault is conditional on the determination of the position of the arc fault downstream of the electrical protection device, the method characterized in that the phase of measurement of several electrical quantities linked to the supply current comprises the following steps: - the measurement of a first electrical quantity (MES_AC_W) linked to the supply current in a low frequency band and over a first period, - the measurement of a second electrical quantity (MES_AC_A) linked to the supply current in the low frequency band and over a second period, and - the measurement of a third electrical quantity (MES_HF) linked to the supply current in a high frequency band and over a third period. - the measurement of a first electrical quantity (MES_AC_W) linked to the supply current in a low frequency band and over a first period, - the measurement of a second electrical quantity (MES_AC_A) linked to the supply current in the low frequency band and over a second period, and - the measurement of a third electrical quantity (MES_HF) linked to the supply current in a high frequency band and over a third period.