Came across the attached Belden test lead wire which may be of interest to some. It is rubber coated #24 AWG. For cold weather ;) Made up of 45 strands of #40 ! Diameter ~ 1.7mm comes in Red and Black. 1,000 working volts Break down @10,000V I believe some places may sell it in 25 foot lengths.
Specs: http://www.farnell.com/datasheets/1748403.pdf
I have no connection the this product.