I got an old Delta carbide tool grinder at an auction and have a wire question. The tag on the grinder specify single phase 220v. Well, the grinder has a conventional 110v three prong plug on it. Would be possible the person wired it for 110? The tag does not specify 110/220, just 220. How can I really tell? I dont want to put a 220 plug and feed it 220 if ts wired for 110.