An electric arc detection method in an electrical installation providing an electrical signal, comprising the following steps respectively carried out in a current window of a plurality of time windows for observing the electrical signal: i/ applying, to said electrical signal in parallel with at least one first filtering centered on a first frequency (F 1), a second filtering centered on a second frequency (F 2) and a third filtering centered on a third frequency (F 3), said first, second and third frequencies being distinct; ii/ determining, for said window, at least samples resulting from the first filtering, samples resulting from the second filtering and samples resulting from the third filtering; iii/ determining the correlation between said samples determined for the current window and samples determined following the implementation of steps i/ and ii/ for at least one other window from the plurality of time windows for observing the electric signal; and iv/ detecting the presence of an electric arc as a function of at least said determined correlation. step iii/ for determining the correlation comprising determining at least one respective correlation from among: - a first correlation between said samples resulting from the first filtering and determined for the current window and samples resulting from the first filtering and determined for the other window; - a second correlation between said samples resulting from the second filtering and determined for the current window and samples resulting from the second filtering and determined for the other window; - a third correlation between said samples resulting from the third filtering and determined for the current window and samples resulting from the third filtering and determined for the other window; said method being characterized in that it further comprises a step v/ for calculating, among the samples resulting from a respective filtering among the first, second and third filterings, for the current window, the number of successive samples with a value greater than zero and a step vi/ for comparing said number to a threshold; and in that step iv/ for detecting the presence of an arc depends on at least said comparison and the correlation determined from among said first, second and third correlations. i/ applying, to said electrical signal in parallel with at least one first filtering centered on a first frequency (F 1), a second filtering centered on a second frequency (F 2) and a third filtering centered on a third frequency (F 3), said first, second and third frequencies being distinct; ii/ determining, for said window, at least samples resulting from the first filtering, samples resulting from the second filtering and samples resulting from the third filtering; iii/ determining the correlation between said samples determined for the current window and samples determined following the implementation of steps i/ and ii/ for at least one other window from the plurality of time windows for observing the electric signal; and iv/ detecting the presence of an electric arc as a function of at least said determined correlation. - a first correlation between said samples resulting from the first filtering and determined for the current window and samples resulting from the first filtering and determined for the other window; - a second correlation between said samples resulting from the second filtering and determined for the current window and samples resulting from the second filtering and determined for the other window; - a third correlation between said samples resulting from the third filtering and determined for the current window and samples resulting from the third filtering and determined for the other window;