So it looks like i have 2 options, 1. to comply with 430-53(a) my branch circuit has to protected with an OCPD of not more then 15 amps. or 2. comply with 430-53(c) having motor controllers with proper listings for group installations etc which would allow me to use a 20 amp circuit (3amps X 6 units = 18amps) next normal size above that = 20 amp circuit.