Sanity check for current transformer burden resistor calculations
My off-the-cuff calculation is 0.5 / (0.02 / 1011) which is the same as (1/(0.02 / 1011)) * 0.5 = 25,275 Ohms. 

I work in RPN, so the second calculation is how I solved the equation. 0.02 [Enter] 1011 [Divide] [Invert] 0.5 [Times] 

Yeah - that resistor value seems high but upon inspection, is reasonable.