Quick Answer
Properly grounding parallel generators involves connecting the generators' neutral points together, then to a grounding electrode in the earth, typically a grounding rod, with a wire that can handle the combined current capacity of all generators.
Selecting the Right Grounding Equipment
When selecting grounding equipment for parallel generators, consider the combined current capacity of all generators. For example, a 2 kW generator has a 30-amp capacity, so four of these generators would require a grounding wire with a 120-amp capacity to safely handle the combined load. Use a grounding wire with a rating of at least 125% of the combined current capacity and match the grounding wire gauge to the size of the grounding rod.
Installing the Grounding System
To install the grounding system, start by driving a grounding rod into the earth at least 8 feet deep. The grounding rod should be made of galvanized steel or copper and have a diameter of at least 1/2 inch. Next, connect the grounding wire to the grounding rod and then to the neutral point of each generator. Make sure the grounding wire is securely attached to the grounding rod and the generators. Finally, perform a ground fault test to ensure the grounding system is functioning properly. The test should show a resistance of 1-10 ohms between the grounding wire and the earth.
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