I believe the typical type disco for a residential A/C unit is not a type that requires HP rating such as 430.109 (2) or (3), in which case determining the equivalent HP in complying with the requirements of 430.109, as stated in 440.12(A)(2), is not necessary.
Of course if you do you a type of disco that requires sizing according to HP rating, then you have to follow 440.12(2).
Can anyone tell me for sure what type of disco it is with the pull out handle that you reinsert upside down to assure it is off, typically seen for res. A/C's?
Also, does 430.109 apply to A/C units, specifically? Section 440 does not refer to 'type' of disco as 430.109 does.
When an A/C unit lists the branch circuit selection load the %'s do not apply. It is easily understandable why most people would interpret the phrase ...'115% of the nameplate rated current or branch-circuit selection current, whichever is greater,...
It sort of reads like--115% of the nameplate rated current or 115% of the branch-circuit selection..; but this is the incorrect interpretation. Branch-circuit selection current is taken at face value as Don pointed out.
This is why you can use #10's and don't need #8's. You don't take 125% of the branch-circuit selection current, you use the number they give you. #10's in the 60 degree column is good for 30 amps.
Also the NEC is not allowing a larger breaker than usual. The conductors are allowed to be protected at the motor, instead of the supply point. The breaker is strictly short circuit protection.
Reno, I think I know what you meant by what you said, but it could be misinterpreted, so I just wanted to clarify.
