well your ground wire is green or copper the ground on the back of an outlet is solid copper if wired right so here we go your ground will derect any loose current to the closest means of a ground solid steal or a good fixture is sufficent ground but what you might want is to wire your green ground your white neutral and your black feed to a 3 prong plug like 1 off an extention cord this way if your wireing is bad it will trip the breaker and shut off electric on that circit this will prevent fires witch are very possible with water and lights well good luck