Heads up: was informed by contractor friend whose friend in the trade shared something interesting about newer installations of AC. Some AC in particular require 4 wires over the traditional 3. The additional wire is an extra neutral from DB box to compressor.

Samsung AR triangle series is one prime example. If the fourth wire is not present, they start and after 5 minutes the following error flashes across the led display "E 01".

So for new renovation or if hacking out and fitting in new pipes, put in 4 wires. You never know when it's going to come in handy.

I prefer Yorke instead Panasonic.