My APC UPS is connected to my computer with a USB-A to rj45 cable. It is the most cursed cable I own, narrowly beating out the type-A to type-A usb2 cable I needed to buy to get a HTC vive to work. (I later "upgraded" to a type-c cable with A-to-C adapters on either end.)

IIRC, the Ethernet standard means ports should tolerate 5V, but I'm still spooked someone's going to use the cable thinking it's something else.