Tom, thank you for your response as well. I can make a diagram tomorrow and will post. The heatsinks we are using to transmit the heat to the material are in fact ceramic on the portion that touches the material and every heater and all portions of the vessel not close to a sensor are covered in ceramic fiber Insulation (kaowool) 2inches in thickness). Each coil is a bit over 1.7ohms and is operated at 60V and we are currently running 11 coils, for a total of right under 23kw of total peak draw if all heaters are engaged at the same time. Engaging each heater is accomplished by a relay activating a large solenoid that completes the 60V circuit. We have 3 phase 480V transformers with 60V output from each leg AC and each leg is capable of powering 6 of the heaters (maybe more, but this is the limitation that has been set). The transformers are rated at 65KVA.