The Arduino can be powered via USB, power jack or VIN/GND pins.
Does the Raspberry PI 2 offer options for power other than the microUSB connector ?
Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi. It only takes a minute to sign up.
Sign up to join this communityYes.
Both those methods bypass any protection afforded by the 2 amp polyfuse.