I don't use insulated wire at all. Most of my wire runs are made from bare 17 gauge aluminum E fence wire. I do use small sections of a insulated sleeves to run the wire in if it has to pass through an area and I don't want it to ground. You buy that in small rolls at TSC or wherever you get the fence wire and other insulators.
I also use ratchet type tensioners on most runs to keep the wire straight and tight (no sags). That helps keep it away from anything that might short it out.
I also use ratchet type tensioners on most runs to keep the wire straight and tight (no sags). That helps keep it away from anything that might short it out.