System for detecting an electrical fault in an electrical installation comprising a plurality of electrical conductors (14A, 14B, 14C), the system comprising: - at least two measuring modules (16A, 16B, 16C), each measuring module (16A, 16B, 16C) comprising first radioelectric communication means (24A, 26A, 24B, 26B, 24C, 26C), a sensor (22A, 22B, 22C) for measuring each electrical parameter associated with a corresponding electrical conductor (14A, 14B, 14C), and a first clock (34A, 34B, 34C) defined by a first initial instant (I01A, I01B, I01C) and a first clock frequency (F1A, F1B, F1C), each measured value being capable of being associated with a first instant of measurement (Im1A, Im1B, Im1C) determined relative to the first initial instant (I01A, I01B, I01C) and as a function of the first frequency (F1A, F1B, F1C), - an acquisition unit for acquiring the measured values, comprising second radioelectric means (40, 42) adapted to communicate with the first radioelectric communication means (24A, 26A, 24B, 26B, 24C, 26C), characterised in that the system comprises, for at least one of the measuring modules, a member for detecting the electrical fault associated with the corresponding electrical conductor, the detection member being capable of determining the value of an instant of detection (Id1A) of the fault relative to the first initial instant and as a function of the first frequency, in that the acquisition unit comprises: - first means for determining the value of each instant of detection relative to the first initial instant (I01B, 101C) and as a function of the first frequency (F1B, F1C) of the other measuring modules (16A, 16B, 16C), - acquisition means for each measuring module for acquiring only those measured values for which the first instant of measurement (Im1A, Im1B, Im1C) is within a corresponding first predefined time interval (T1A, T1B, T1C), each corresponding first interval (T1A, T1 B, T1C) comprising the value of the instant of detection (Id1A, Id1B, Id1C) determined for said measuring module with which it is associated. - at least two measuring modules (16A, 16B, 16C), each measuring module (16A, 16B, 16C) comprising first radioelectric communication means (24A, 26A, 24B, 26B, 24C, 26C), a sensor (22A, 22B, 22C) for measuring each electrical parameter associated with a corresponding electrical conductor (14A, 14B, 14C), and a first clock (34A, 34B, 34C) defined by a first initial instant (I01A, I01B, I01C) and a first clock frequency (F1A, F1B, F1C), each measured value being capable of being associated with a first instant of measurement (Im1A, Im1B, Im1C) determined relative to the first initial instant (I01A, I01B, I01C) and as a function of the first frequency (F1A, F1B, F1C), - an acquisition unit for acquiring the measured values, comprising second radioelectric means (40, 42) adapted to communicate with the first radioelectric communication means (24A, 26A, 24B, 26B, 24C, 26C), - first means for determining the value of each instant of detection relative to the first initial instant (I01B, 101C) and as a function of the first frequency (F1B, F1C) of the other measuring modules (16A, 16B, 16C), - acquisition means for each measuring module for acquiring only those measured values for which the first instant of measurement (Im1A, Im1B, Im1C) is within a corresponding first predefined time interval (T1A, T1B, T1C), each corresponding first interval (T1A, T1 B, T1C) comprising the value of the instant of detection (Id1A, Id1B, Id1C) determined for said measuring module with which it is associated.