I am designing a 186kW PV system and need to make the grid connection on the supply side, and am using a CT cabinet. I would like some advice on grounding. The existing 480V service has an 800A fused main disconnect before the MLO panelboard. The Neutral and ground bond is in the main disconnect, as is the GEC. I have an AC combiner taking the three 62kW inverter outputs and providing a single PV System output to a 400A nonfused disconnect to serve as the PV System disconnect. I am bringing the system gound from the inverters thru to the ground bus in the combiner, and then then on to ground lug in System disconnect, and to the building main disconnect ground / neutral bus. I am unsure if the CT cabinet needs a separate ground or if just bonding the neutral to the ground in the CT Cabinet is what is required. I see example utility connection diagrams with the Netral bonded to the ground lug in the CT cabinet. Attached is the diagram. Is there anything wrong I am doing here? Explanations and/or code references would be appreciated.
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