What is the max amps for a 4 gauge wire--can 4 gauge feed a 100A breaker box?
No number four is only good for seventy-five amps. I am pulling that out of my head, my book is in the truck. I think for a one hundred amp service you need at least number two. I will check for sure tomorrow and post it on my message board. Remember the length of the run is a factor. A quick web search will give you some calculators to help you figure this out for your application.