Why is an old fuse panel dangerous? - mcgarryandmadsen Combine that issue with the fact that some older fuse panels are only rated at 60-amp total capacity and most have multiple wires clamped under the too-few fuse lugs, and you can see why insurance companies don’t want to write a policy for an older home with a fuse panel still in place. As an old-time country realtor, “Miss Margaret I am replacing a sub panel fuse box with a new breaker box Jul 26, 2010I am replacing a sub panel fuse box with a new breaker box in the detached garage for my cottage which was built over 60 years ago. coming into the fuse box presently are 2 cables each containing what appears to be #10 black, red and white. In total it appears that I have 2 #10 blacks, 2 #10 reds and 2#10 whites. No ground.