One of the most common causes of electric motor failure is bearing issues, responsible for around 51% of failures. This is followed by electrical insulation faults, which are responsible for up to 30% of failures. But, while predictive maintenance techniques, such as vibration analysis, are often used to analyse the motor’s health, in comparison little is done to detect signs of insulation deterioration and failure. Here Chris Robson, Sales Director of Houghton International, discusses the importance of static motor testing for assessing the full condition of motors.