Using an equipment ground as a return path instead of the neutral will allow current to be sent back on the equipment ground system continuously. This potentially can cause a shock hazard for anyone coming in contact with a grounded surface with a lower impedance that of the energized frame of an appliance.
Any loose connection in conduit or cable sheathing will create a high resistance connection that will spark and can develop into a fire.
If you are considering doing this as a solution to a broken neutral, or any other reason,do this at your own risk, and be prepared to be responsible for the damaging effects.
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