Romex in tight spaces?

I am installing some LED under cabinet light bars and to avoid having to fish through an exterior wall I was hoping I could drop the 14/2 romex down the corner of the wall between the wall and the back corner of cabinet from up top (where it drops out of the attic). The space is tight, but for the most part the... show more I am installing some LED under cabinet light bars and to avoid having to fish through an exterior wall I was hoping I could drop the 14/2 romex down the corner of the wall between the wall and the back corner of cabinet from up top (where it drops out of the attic). The space is tight, but for the most part the romex slides down this little gap without much force - to illustrate the size for example 14/3 "might" fit down it, but 2 Romex strands would not fit. I am worried about overheating the romex with what I know about romex, insulation, pipes and conduits.
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