That's just how the US electrical code works. I assure you that every "15A" outlet on the wall can handle 20A. That's why products like this don't have a fuse:

That's just how the US electrical code works. I assure you that every "15A" outlet on the wall can handle 20A. That's why products like this don't have a fuse: https://www.homedepot.com/p/Woods-2-ft-12-3-SJTW-Multi-Outlet-3-Outdoor-Extra-Heavy-Duty-Adapter-Extension-Cord-Orange-990824/301132652 https://www.homedepot.com/p/Woods-2-ft-12-3-SJTW-Multi-Outle...