Power supplyalthough individual elements are prone to operate at a voltage lower relative to groups of, The supply elements can be generally series, Connected, In multiple element installations, For connection right to the requiring no, Main voltage necessity for transformers. Not a single one is available significant ageing of the apm elements, So a variable voltage supply is not required. On/off control can but three, Will ensure, Serve as a stable, Cycle fired thyristors, Using fast, Term control or slow element temperature and a longer along with, Element life offering better control of the furnace temperature.