Quote Originally Posted by Sparky View Post
Run some SER cable. No conduit needed.
That's a better solution but it sounds like he has wire he wants to use up. #4 is not good for 100 amps. If you're going conduit and you think you might want 100 amps down the road then do run 1 1/4" or make life easier and run ser cable good for the 100 be sure to use deox

Edit; posting from the phone sucks