I bought the 50 amp spa panel from HD last year but have not done anything with it yet. I have some questions for you more electrically experienced people. First, my house still only has a glass fuse main box with the pull-outs holding cartridge fuses for the main and dryer circuit. The mains are 60 amp fuses, the dryer fuses are 30 ... so can I use the spa panel just for the GFI? If not, who wants to buy a spa panel?
I believe so, yes. If you leave the fuses alone, and install the GFI on the end of a 30 amp line, the glass fuse should provide the over-current protection for the wiring, and the GFI protection for you.