This Article is extracted from Mike Holt’s Illustrated Guide to Understanding NEC® Requirements for Solar Photovoltaic Systems. Understanding NEC Requirements for Solar Photovoltaic Systems, Based on the 2011 NEC Click here to buy a copy or read more about it. *Please note in the follwing extraction that blue underlined text indicates a 2014 NEC change. Section 690.47 – Grounding Electrode System (A) Alternating-Current PV System Grounding Requirements. For ac PV systems, a grounding electrode system must be provided in accordance with 250.50 through 250.60, with the ac grounding electrode conductor installed in accordance with 250.64. Figure 690–109 Figure 690–109 (B) Direct-Current PV System Grounding Requirements. For dc PV systems, a grounding electrode system in accordance with 250.166 for grounded systems, or 250.169 for ungrounded systems, must be provided. Figure 690–11
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