One must start the day early to slip one past Trumpy!
Yes, I took the pic before the insulation was added, so you could see the wire.
NEC does ban running "power limited" circuits in the same raceway as power cables- so running the t-stat wire together with the power leads is a violation. The whole point of my pic is to show your average non-HVAC person that the t-stat wires are often run separate from the power, even though they may not be visible without taking things apart.
Likewise, most electricians are not aware that some systems don't even have a cable run to the condenser (outside unit).
