If the wiring in the plugmolds is 12AWG, then it's good to hook. The
breaker is 15A, so I doubt that the 12AWG line will heat up.
[figuratively speaking!]

Yes, the 3 foot or so is a small run.

Tim Shoppa wrote:
I thought all the plugmold (whether 15A or 20A) was wired internally
with 12AWG. In any event the wire length inside the plugmold is tiny
compared to the run outside, right?