Ignorant would be asking which color would look best for your cob frame. Lol All wire has a voltage rating on the package and fine printed on the wire itself. 18g solid wire should be fine but please check the voltage. That voltage should be higher than the drivers voltage.
Thanks for the reply Smo. There is no voltage on the package or the wire itself. Made by CCI. All it says is low voltage thermostat and bell wire. Can't find anything about it on CCI.s website