Ultrasound inspection may be performed on both open and enclosed electrical equipment at all voltages (low, medium, and high). When electrical apparatus such as switchgear, transformers, insulators, or disconnects and splice fail, the results can be catastrophic. This is just as true in industrial plants as it is in the power transmission and distribution side. Electrical discharges such as arcing, tracking or, in higher voltages, corona have the potential to create equipment failure and costly downtime.