A method for non-intrusive current measurement in at least one electrical conductor, comprising the steps of: a) arranging one or more magnetic sensors at a number (L) of different locations adjacent to a number (N) of individual electrical conductors, said conductors extending in a third direction (z); b) performing a number (M) of measurements at a sampling frequency (fs) of a magnetic field ( H ⇀ ) at least in a first direction (x) making a first angle with said third direction (z) and in a different second direction (y) making a second angle with said third direction (z), at each of said number (L) of different locations, to obtain said number (M) of measurement data for each of said first and second directions (x, y); c) performing a harmonic analysis, preferably a discrete Fourier transformation, on each set of said number (M) of measurement data for each of said first and second directions (x, y) to obtain frequency distributions of said measurement data; d) determining a current frequency (fc) of electrical currents (I) flowing in said conductors; e) selecting magnetic field amplitude coefficients which correspond at least to said current frequency (fc) from said frequency distributions of said measurement data to obtain a first component (H x ) of said magnetic field ( H ⇀ ) in said first direction (x) and of a second component (H y ) of said magnetic field ( H ⇀ ) in said second direction (y) at each of said number (L) of different locations; and f) calculating electrical currents values (I i ) for currents flowing in each conductor from said first and second components (H x , H y ) of said magnetic field ( H ⇀ ) at each of said number (L) of different locations. a) arranging one or more magnetic sensors at a number (L) of different locations adjacent to a number (N) of individual electrical conductors, said conductors extending in a third direction (z); b) performing a number (M) of measurements at a sampling frequency (fs) of a magnetic field ( H ⇀ ) at least in a first direction (x) making a first angle with said third direction (z) and in a different second direction (y) making a second angle with said third direction (z), at each of said number (L) of different locations, to obtain said number (M) of measurement data for each of said first and second directions (x, y); c) performing a harmonic analysis, preferably a discrete Fourier transformation, on each set of said number (M) of measurement data for each of said first and second directions (x, y) to obtain frequency distributions of said measurement data; d) determining a current frequency (fc) of electrical currents (I) flowing in said conductors; e) selecting magnetic field amplitude coefficients which correspond at least to said current frequency (fc) from said frequency distributions of said measurement data to obtain a first component (H x ) of said magnetic field ( H ⇀ ) in said first direction (x) and of a second component (H y ) of said magnetic field ( H ⇀ ) in said second direction (y) at each of said number (L) of different locations; and f) calculating electrical currents values (I i ) for currents flowing in each conductor from said first and second components (H x , H y ) of said magnetic field ( H ⇀ ) at each of said number (L) of different locations. <EOS>