I need to run a 1" cond. from a 120/208V 3ph panel to an area of a bldg. to feed 9ea. 20A recep. circuits in clinical exam rooms. If I pull 3, 3ph and neutral sets with 1 ground, and use #10 wire to the first device on each circuit, does that cover the de-rating issues, or are there other factors to consider?
