hey guys, different publications (ie, NEC, IEEE) have differrent methods of obtaining voltage drop right? for instance their equations vary.
I just wanted to get confirmation on this. Thank You
I guess the shortest possible answer to this is "yes, confirmed" but I'm not sure that's what you're looking for.
Each method/equation or on-line tool usually makes some simplifying assumptions that hopefully are noted so the user verifies they are valid or not... for example, for small conductors the ratio of inductive reactance to resistance may be small and you can ignore the reactance. For other applications where the conductor may be large and the power factor may be poor, you absolutely need to consider the reactance and load power factor using IEEE method 141 or you may have an unpleasant surprise.
IEEE phase-to-neutral voltage drop = I?(R?cos(?) + X?sin(?)) and
even this is an approximation with a known error, although usually very small.
I guess something to keep in mind is there is only one "correct" answer... it is up to the user to determine whether the answer they got is "correct enough" and IMHO, a lot of the simplifying assumptions aren't needed these days with spreadsheets/apps etc. that can crank out the exact solution.