1/0 will give you problems. dont use knu fuseholder if you do get that wire. it will do fine for the big 3 since you are using such shorter pieces. its copper clad which is why it cant handle too big of a load like 100%ofc wire. either way if you are fine with using it then go ahead and get it. i will never recommend it to anyone again.Well i used the 4guage for my power wire/gnd to my trunk, and i thought it was fine.. the only thing im concerned about is it saying "made for lighter current loads"