I fail to see how an open bond on a galley unit would make it live with 115VAC.
I agree with Konehead 100%. As soon as the cabin attendant provides a path of continuity between the galley complex and another metallic part of the aircraft structure, he or she becomes the actual bonding lead/earth strap. Tripping of earth leakage devices all depends upon how galley accessories are wired up. Tripping of c/b's will have nothing to do with a pesron providing a return to earth.