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The industry has constantly allied to the maintenance of its plant as a measure of optimization of profits, costs and development of advantages. The thermography proposes to be an improved tool in predictive maintenance. The aim of this paper is to study the applications of thermography in an industrial installation, verifying the time and efficiency of the tool. In an analysis of a system with a monthly average capacity of 165,652 kWh, thermal images were captured and correlated with the industrial maintenance philosophies and the maintenance sector reports of the plant. Performance was obtained with excellent agility in the method of monitoring and recording the main electrical system of the plant with the description of the defects, faults and conditioners discriminated using the thermography. For future work it is recommended to collect and cross-measure measurements of defective equipment, obtained by invasive methods and by thermographic method, to measure statistical reliability and operation data.