Perhaps a little clearer....
BigB example is 14/2NM, but he said 25 amp OCP, using the nameplate max figure.
Using the max OCP, a #12 EGC would be required, so using NM he has to use 12/2.
I'm not sure I follow you Hotline...
When doing AC units the nameplate has all the info for sizing the branch circuit wiring...and sizing the overcurrent device.
For example...if the nameplate gives a MINIMUM BRANCH CIRCUIT AMPACITY of 30amps and a MAXIMUM BRANCH CIRCUIT OVERCURRENT DEVICE of 50amps...
I will wire the unit with 10-2 romex and connect it to a 50amp breaker.
Follow me?
shortcircuit
