i need help understanding a correction

[Strathead]

Just FYI, the inspector showed his lack of attention to detail when he cited THHN wire, unless this heat pump it the rare beast that is installed inside of a building. The type of wire going to the unit is most likely THWN-2 at 90º but could be THWN at 75º in no case is wire run outside THHN. This doesn't change anything else.

 

[tortuga]

Double check the labeling on the liquidtight or carflex to the unit.

Most have a temp rating of 60 degrees C when used in wet locations

Yeah 356.12(9) and future proofing is why I typically use the 60°C ampacity table.
I am surprised that after all these years someone at Carlon or one of the major manufacturers with access to heat transfer modeling software has not published some calculations and real world tests, or perhaps they did and thats why the restriction is there?

 

[don_resqcapt19]

Double check the labeling on the liquidtight or carflex to the unit.

Most have a temp rating of 60 degrees C when used in wet locations

In this case the "operating current" would not exceed the 60°C ampacity. I do not see the fictitious 25% of the compressor current that is added to obtain the MCA as "operating current".

 

[Eddie702]

I think it is great that the inspector was a reasonable guy. In my 46 years pulling permits most of them are if you approach them right. You just have to know the code.