HD Electric Co.’s Phase Rotation Meter (PRM) is used to determine the leading phase of any two phases in a three-phase conductor system. The PRM is a dual-range 0 to 5 kV and 0 to 15 kV device that can be used as high as 45 kV when optional resistor sticks are added. It consists of two sticks with a connecting cord and ground lead. Phase rotation is determined by taking readings on the two phases, first in one direction, and then the other. The meter will indicate which phase is leading and which is lagging. The PRM can be used in overhead applications or in underground applications by adding the appropriate underground probes for applications. (http://www.hdelectriccompany.com)