Been asked to look at provision of a new supply for a 72KW TPN blow heater. Am getting current per phase coming in at over 100A with a cable size of 35mm 4 core. Having taken this as correct, am now looking at a 36KW option instead. Current is coming in at around 52A with a cable size of either 10mm 4 core or 16mm 4 core. I don't know anything else at the moment until I visit the site next week, but am not confident that these valuses are correct for the KW ratings.
Have assumed a pf of 1 for resistive load. Don't know how the elements are configured in the heater and am guessing the neutral is required for the fan motor and controls.
Input gratefiully recieved..