Quick Answer
Grounding a parallel generator system requires a dedicated grounding point and a grounding cable that connects to a grounding rod driven 8 feet into the earth. The grounding system should be sized to handle the combined current output of all generators and be isolated from the neutral points. Proper grounding minimizes the risk of electrical shock and ensures safe operation.
Grounding System Requirements
A dedicated grounding point, typically a grounding rod driven 8 feet into the earth, is essential for grounding a parallel generator system. The grounding rod should be made from a conductive material, such as copper or galvanized steel, and be sized according to the National Electric Code (NEC) Table 250.66. The grounding cable connecting the generators to the grounding point should be sized to handle the combined current output of all generators, typically 10-20% larger than the total rating of the generators.
Generator Grounding and Bonding
Each generator in the parallel system should be grounded and bonded to the grounding point, typically at the neutral point. The neutral point is the connection point between the generator’s neutral wire and the grounding system. This ensures that the generators are electrically connected and can operate safely in parallel. For example, a 20 kW generator might require a 2 AWG grounding cable, while a 50 kW generator might require a 1 AWG grounding cable.
Safety Considerations
Proper grounding is critical for safe operation of a parallel generator system. Improper grounding can lead to electrical shock, equipment damage, and even fire. To ensure safe operation, it’s essential to follow the grounding requirements specified in the NEC and manufacturer’s instructions. Regular inspections and maintenance of the grounding system are also crucial to ensure the system remains safe and functional.
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