I'd hope they know their product but also, as I said, the people seemed "young". The first guy told me running 22/2 should work. Maybe if I ran it 3 feet.
It's common to power the 2GIG panel with 22/2 over longer distances than 3ft. You might as well use 18/2 if you are running a new cable but I've seen many installations that used existing 22awg keypad wire to power the panel and they work fine at distances around 20-30ft. Even further if you use all 4 conductors of the 22/4 keypad cable and double them up. I've also seen a 2GIG panel run on 12V. I know one DIYer off the top of my head that powers his 2GIG panel with the 12V aux power from his previous panel and it's been working fine for 2+ years, though I do not recommend doing that! I don't know what the minimum voltage is but I guess probably around 12V.
Thanks - it helps to know that there is some flexibility.
In the end of the day, this has nothing to do with 2Gig as much as it does with the laws of voltage loss over length and gauge.
The problem is I can't find what the minimum voltage/amps the panel(s) require.
But it's clear from your example, I should be more than fine. I'll have two piezo external sirens powered by the main panel but those don't draw too much so I should be fine.
As I mentioned, I'll be testing this all out by cutting out 40 foot lengths for each panel and siren, connecting it all in their respective locations on the floor, and testing connectivity before drilling and running wires.