How to Determine the Fuse/Wire Size - oznium Jul 06, 2018Most people get caught up on fuse wire size but once you get the hang of it, it shouldn’t cause too many headaches. This is an in-depth fuse tutorial explaining everything you need to know about fuses and how to size a fuse. Breaker Panel Sizing - Buyer's Inspection Service 60 Amp Panel This size service, usually a fuse box, is no longer installed in new homes because homes now use a lot more electricity than they did 40 years ago. This size service is inadequate for normal load use. If you have a home with this size service we recommend that it be upgraded to 100 amp service.