Can I use a 14-3 Romex for two different electrical circuits on a 15A QT/tandem breaker? Or should I use one 14-2 for each?
My mistake, apologize.
Post edited: the QT breaker is a space saver. My panel is 30 space 40 circuits. So I intend to have two different circuits on one space. I will use a 1 pole Siemens Q1515 with no clip. Here is the link Tandem breaker
So turning off individual circuit.