Minimum Gauge Wire for Sensors?

[psquared89]

I have searched and I could not find the answer to my question (though, frankly I'm surprised that I'm the first person to ask it...)

I was mounting/wiring the GTS sensor yesterday, and when it came to wiring it, a team member brought an interesting point to my attention. Our team had used an old junk PWM wire to make the temporary connections for testing purposes, but for the final wiring, do we need to use 18 guage wire? The rules state, "Any circuts protected by a 20 Amp breaker need to have at least 18 AWG wire". Do we need to use 18 gauge wire for the little sensors (which couldn't possibly draw more than 100 mA)? Or can we use PMW wire? The boards look like they were made for the PWM wire (the holes on the boards fit the PWM wire pins perfectly), and you can't fit 18 gauge wire through them (soldering, if we must).

If no one here knows the answer, could someone please post the question on the Q & A forum? Our teacher has not been able to log on and we could not post there.