Generally if there is no ground wire, then grounding is not possible without running new wire to box.
http://waterheatertimer.org/How-to-wire-switches.html#outletsSometimes, the ground wire is cut back so wire appears to have no ground wire. Then if wire can be pulled out further, the ground wire can be discovered.
Sometimes a nearby outlet or switch box will have ground wire that can be brought to box with no ground.
As general rule with 120Volt outlet, the neutral wire is bonded back to same busbar as ground wire, and then both ground outdoors to copper ground rod.
http://waterheatertimer.org/See-inside-main-breaker-box.htmlDo not wire electric motor without ground wire.
Generally other light household appliances such as lamp, or tv, or electric drill have polarized plug with no ground prong, and are double-insulated and there is little risk or need for a grounded plug.
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