If the box is metal then attach the fixture ground wire to the box. Light fixtures and the ground wire electrical wiring in some older homes does not have a ground wire for outlets ans switches and some older homes have ground wires that are bonded behind the electrical box.
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Ceiling light no ground wire. Step 4 run your ground wire from the light conduit box to the nearest copper water pipe. If you dont have a wire coming in to hook your ground to what you do is you take your ground wire which is either a solid copper or a green wire youll take that ground wire and you wrap it. You can add a ground wire to your electrical box in the ceiling for an extra measure of safety when replacing a ceiling light. The ground wire carries displaced electricity away to reduce the risk of electrical shock if lets say the metal parts of the ceiling fan or any other appliance or part attached to your electrical system becomes accidentally charged. Disconnect your lighting circuit at the main service panel. Twist together the black wire from the wall to the black wire from the light and cap these as well.
How to provide the ground wire safety feature for ceiling fans the ground wire system of the home serves as a safe path to the earth ground in the event of an electrical malfunction where voltage is released outside of the safely insulated energized areas of any electrical device. If your light does not have a black wire due to its age then attach the black electrical wire to the gold screw on the fixture. The ground wire doesnt carry any electrical current unless there is a problem in your electrical system.