Abstract: Disclosed is an electrical condition monitoring system that is connectable to an electrical device for monitoring the electrical device when in operation, wherein: (i) the electrical condition monitoring system includes (a) a sensing arrangement for temporally sensing an electrical supply to and/or from the electrical device and generating corresponding sensed data; (b) a data processing arrangement that is configured to process the sensed data to generate a corresponding temporally-changing Fourier spectrum including signal harmonic components and to process temporal changes in magnitudes and frequencies of the signal harmonic components to generate analysis data; and (ii) a user interface is configured for user entry of input for analyzing the analysis data and the data processing arrangement is configured to analyze the analysis data based on the input to obtain information indicative of operating condition of the electrical device; characterized in that: (iii) the data processing arrangement is operable t