Enphase microinverters do not require an EGC (equipment grounding conductor).

• A. False
• B. They require an EGC only in certain jurisdictions
• C. They do not require an EGC
• D. It depends on the module type

Answer: (C)

The idea being tested is how grounding is handled with Enphase microinverter systems. In these setups, the DC side is isolated from the AC side, and the inverter enclosure is bonded to the building’s ground path through the AC branch circuit’s equipment grounding conductor. Because there are no exposed conductive parts on the DC side that would present a fault current path, a separate equipment grounding conductor for the DC wiring isn’t required. The required grounding path is the AC system ground—bonding the inverter enclosure and mounting hardware to the service grounding electrode system per the installation manual and code. This is why, in standard Enphase microinverter installations, a dedicated DC EGC is not necessary. Always follow the manufacturer’s instructions and local code requirements, but the general approach is that the AC grounding path provides the needed safety grounding.