Are there any formal rules as to rounding when doing calculations?
In a practice workbook, the calculations are rounded to the tenths. When I do the calculations precisely (to the thousandths) my fractional answer is below .5, but the book's fractional calculation is .5 exactly.
This changes the answer I get versus what the book says is the answer.
I don't see anything in the NEC that calculations must be rouded to the tenths before applying 220-3(b).
