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:
I have no connection the this product.