The definition of Array in 690.2 is ambiguous. Figure 690.1(A) seems to indicate that groups of modules on different roof surfaces could be considered a single array. The textual definition itself could be construed either way. We have successfully argued that an entire roof mounted system with modules on different roofs constitutes a single array. Therefore, if the additional grounding electrode required by 690.47(D) qualifies for Exception 2, it is not required. However, our "favorite" jurisdiction has just interpreted it differently, requiring a separate electrode and electrode conductor for each roof surface... and there are a lot of roof surfaces on this particular job. Complying will not be fun or cheap.
How is your jurisdiction interpreting this? Related note: Figure 690.1(A) would effectively make each module in a microinverter based system a distinct array. The figure seems to imply that all modules that form a PV Output Circuit are a single array. Each module is a complete PV Output Circuit in a microinverter based system. It's strange that the textual definition is concerned with mechanical assemblies, but the figure refers to electrical configuration in defining Array. In fact, in the text an Array is defined as components forming "a direct-current power-producing unit." In a microinverter-based system, how can any group of modules be considered an array given that definition? Jason Szumlanski Fafco Solar
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