Method for monitoring for partial discharges, DP, in an electrical installation comprising at least one electrical cubicle, the electrical cubicle comprising at least one item of medium-voltage or high-voltage electrical equipment, the electrical installation including: - at least one first set of sensors arranged inside the electrical cubicle and at least one second set of sensors arranged outside the electrical cubicle, each of the first and second sets of sensors (4, 5) comprising at least one sensor for a gaseous element (Cg); - at least one temperature sensor (Ct) and/or humidity sensor (Ch) arranged inside the electrical installation, characterized in that the method comprises at least the following steps: a1) comparing the concentrations of the gaseous element that are obtained using the first set of sensors and the second set of sensors; a2) determining, on the basis of the comparison in step a1), whether a variation in the concentration of the gaseous element that is acquired by the first set of sensors stems from a factor external to the electrical installation; b1) determining whether there is a correlation between the concentration of the gaseous element that is obtained by the first set of sensors and the measurements from the temperature sensor (Ct) and/or humidity sensor (Ch); b2) determining, on the basis of the comparison in step b1), whether a variation in the concentration of the gaseous element acquired by the first set of sensors stems from a variation in temperature and/or humidity inside the electrical installation; and c) if the response to steps a2) and b2) is negative, deducing that the concentration of the gaseous element that is obtained by the first set of sensors stems from a factor internal to the electrical installation. - at least one first set of sensors arranged inside the electrical cubicle and at least one second set of sensors arranged outside the electrical cubicle, each of the first and second sets of sensors (4, 5) comprising at least one sensor for a gaseous element (Cg); - at least one temperature sensor (Ct) and/or humidity sensor (Ch) arranged inside the electrical installation, a1) comparing the concentrations of the gaseous element that are obtained using the first set of sensors and the second set of sensors; a2) determining, on the basis of the comparison in step a1), whether a variation in the concentration of the gaseous element that is acquired by the first set of sensors stems from a factor external to the electrical installation; b1) determining whether there is a correlation between the concentration of the gaseous element that is obtained by the first set of sensors and the measurements from the temperature sensor (Ct) and/or humidity sensor (Ch); b2) determining, on the basis of the comparison in step b1), whether a variation in the concentration of the gaseous element acquired by the first set of sensors stems from a variation in temperature and/or humidity inside the electrical installation; and c) if the response to steps a2) and b2) is negative, deducing that the concentration of the gaseous element that is obtained by the first set of sensors stems from a factor internal to the electrical installation.