Proton therapy is a form of radiation therapy in which a beam of protons is used.
More traditional forms use x-rays, electron beams, or alpha particles from a radioactive source.
Other than the fact that a cyclotron or synchrotron is used as the been source, it should not be fundamentally different from an radiation treatment location.
The beam source will have some high power requirements for the magnets, and stray magnetic fields might be a design issue.
I would not expect the rest of the building wiring to differ in any way from the requirements of any patient care area.
PS: The value added of using protons is that in theory you can focus the beam better and control how far it penetrates into the tissue.
Whether this added precision leads to improved treatment outcome is still uncertain.
Tapatalk!