In your posting you call the third insulated wire a service return and then an additional ground? A pure 220 volt appliance does not need a neutral wire, but if there are any 110 volt devices in it then a neutral is needed. The ground wire only carries current if there is a short in the appliance No problem in running and extra ground wire but if its insulated it should be tagged green.
On draw bridges we always required a green insulated ground wire in addition to the normal grounds due to the severe corrosive environment.
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