Locate your outdoor power transformer.
Locate a nearby water tap. If there isn't one in the vicinity, you will need a metal pole. If this is the case, insert the metal pole in the ground, the deeper the better.
Shut down the power to your house to avoid electrocution.
Attach the metal wire to the power box or the wires leading out of it.
Attach the other end of the metal wire to the water tap or the pole.