Power Quality International, LLC has successfully completed the 2-year long life-cycle testing of its insulation system for Cast Coil Transformers and received a UL Certificate of Compliance per UL1562 and IEEE Std. C57.12.01-2005 standards. PQI can now display an Underwriters Laboratories (UL) logo for Cast Coil Transformers up to 10MVA, 34.5kV, 180°C Insulation Class.