brother
Senior Member
Have anyone done much vfd sizing for motors?? I know you have to take torque and and horsepower into consideration alot. It appears most of the vfds I have seen tend to have larger conductors feeding it than one would calculate for a motor load without a vfd. Maybe its because the vfd is more oversized, or they used 150% NEC 2008 430.6(C). from the motor tables unlike only 125% sizing for conductors to the motor.
Any one have an instance where they had to size the vfd?? was the feed to the vfd allowed to be smaller than it would be for the motors itself?? How did you size it?
Any one have an instance where they had to size the vfd?? was the feed to the vfd allowed to be smaller than it would be for the motors itself?? How did you size it?