Hello everyone. I would like to know if I am completing this task per the NEC. I have a 220V system and Hermetic refrigeration compressors that I would like to buck down to 200V. The amp draw for the 2 compressors are 18 amps each, plus a 1.5 amp condenser fan. I have found the correct bucking transformer (9KVA) and now need to make sure I am fusing it correctly. Would I size the primary side of my transformer normally (9KVA/220V = 40.9 * 1.67=68, so rounding down to 60A), or would I size it per the motor loads? Should the entire transformer branch, since it is a buck boost transformer, be considered an individual branch circuit or can I treat it as a normal transformer circuit. My initial approach is to size the primary side of the transformer, and then size individual branch protection for each compressor (18*1.75 rounding down is 30A each). So in the end, I have two 60 amp fuses protecting my primary, and 2 30 A fuses protecting each compressor (4 fuses total). Please let me know if I need to clarify anything, and I appreciate the help.