Regulation %

$R e g percent sign equals fraction numerator N subscript s y n c end subscript minus N space over denominator N subscript s y n c end subscript end fraction cross times 100$

$V subscript r e g end subscript percent sign equals fraction numerator open parentheses V subscript N L end subscript minus V subscript F L end subscript close parentheses over denominator V subscript F L end subscript end fraction cross times 100$

$V subscript r e g end subscript percent sign equals fraction numerator left parenthesis V subscript N L end subscript minus V subscript F L end subscript right parenthesis over denominator V subscript N L end subscript end fraction cross times 100$

I know what your thinking. WHICH ONE IS IT. The answer is that it depends. Some manufacturers use different numbers to make their machines look better. Your guess is as good as mine. Not very helpful I know but it shouldn't matter that much.

» Formulae for Rotating Machines