How many circuits usin #12 thhn in emt 3/4". I have to use 75c b/c term blocks are speced . I came up with 4 cir. (we have to use seperate n AND seperate not isolated grounds) Using uglys book i came up with 7to 9 current carr. cond tbl I ythen used corr factors to come up with 15.4 a is it ok to use 4 cir? thanks jj