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4 <br />Figure 4. Example of a typical 5 MW solar farm layout <br />ELECTRICAL COLLECTION SYSTEM <br />The system will collect the direct current electricity (DC) electricity generated by PV modules <br />within its array to combiner boxes similar to what is shown in Figure 5. Combiner boxes are <br />protected by fuses or breakers and are about two feet by two feet square and affixed to the <br />racking system. Cables from the combiner boxes are placed underground in trenches one to <br />two feet wide, at a depth defined by the National Electrical Code (typically two to three feet <br />deep). Trenches are backfilled with screened native soil after cable installation. Cables from