Do tenants need access to Electrical Panel (2 units)

Hi all, I own a duplex that has the electrical panel in the basement. The panel is in a finished room I would like to be locked up. I’ve read that if you own less than 3 units, tenants do not need access as long as they have a maintenance number to call if power or fuses go out. However, I’ve also read that every tenant needs access legally. I live in Wisconsin and can’t seem to find anything legally. Any help would be appreciated! Thank you!:)