Since Pd=V^2/R and R has a PTC effect at least (est.) 1:5 for red hot and in white lightbulbs 1:10 to 2800'K Without these design parameters, one can only guess where your problem lies. The power required to raise an insulated oven to a certain temperature depends on the insulation resistance of the oven and the thermal conductance of the heater to the inner air. This empirical test is nice but, I would like to have some analysis to know how much margin I have. I have to move the kiln to a different location to test with 50A (which would allow me to run up to 5 elements. Update: I ran a test with some of the elements at 240V and they did not fail but, presently I am testing using a 30A circuit so I can't run more than 3 elements. I have been looking for a while and I can't find anything. How to figure the max current capacity for different gauges of Kanthal wire. This would be 9.2A compared to the 8A at 208V but, I would really like to know if the wire can safely handle the 9.2A before I risk damaging the element wires. My next thought is to try running the some of the elements at 240V. Goal is at last Cone O4 (1945F) with stretch goal to Cone 6 (2232F). This worked but, the power reduction was too much and the kiln only got to 1100F. I tried changing the element pairs to run in series to reduce the voltage across each element to 120V. Each element having a resistance of 26 ohms. It has 6 elements made of 16AWG Kanthal APM resistance heating wire. I was given a Ceramics Kiln that is designed for 208V and I am trying to see if there is a way I can run it at 240V.
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