Why is grounding to an appliance not allowed? What may and could happen if this is done?
Answer:
If you mean ground another unit to an appliance then the answer is that the earth(ground)wire of of the appliance to which the additional ground connection was made would be required to carry the earth fault current of both appliances under certain fault conditions and the cable would not be adequately rated for the increased current loading. Any fault in the appliance ground conductor would leave the second unit ungrounded.
One reason for grounding something is to provide a better path for the electricity to flow (instead of through you if you touch it) in case of an electrical short. If you grounded something to an appliance (like a stove) and there was a short then it would send the electricity to the surface of the stove. If in turn the stove was not properly grounded then you could get shocked if you touched the stove.
I'm not sure that you are correct that ground is "not allowed". Most modern appliances only have two prong plugs as a convenience, not by mandate. Appliances and power tools with no ground connector use a technique of "double insulated" to satisfy the electrical safety requirements, rather than a ground wire.
But you could ground an appliance if you wanted to.
If you are considering using an existing appliance as a source for a ground, what happens to that ground when you disconnect the appliance. Proper grounding is so easy to do that you should not need to do possibly dangerous things.
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