The bigger the unit the bigger the gauge wire needed. The smallest unit, the 30, needs the smallest gauge wire, at 12.
WG is just a term for wire plus ground.
What model are you installing?
The wire voltage rating should be fine.
All the big box stores sell wire that size.
Just remember, no romex outside. You’ll have to get the appropriate outdoor materials to run the wire in.
This is an older thread, you may not receive a response, and could
be reviving an old thread. Please consider creating a new thread.
DIY Home Improvement Forum
A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Helping You to Do It Yourself!