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V Grounding <br /> <br />690.41 System Grounding. <br /> <br />For a photovoltaic power source, one conductor of a two- <br />wire system with a system voltage over 50 volts and the <br />reference (center tap) conductor of a bipolar system shall be <br />solidly grounded or shall use other methods that <br />accomplish equivalent system protection in accordance <br />with 250.4(A) and that utilize equipment listed and <br />identified for the use. <br /> <br />690.42 Point of System Grounding Connection. <br /> <br />The dc circuit grounding connection shall be made at any <br />single point on the photovoltaic output circuit. <br /> <br />FPN: Locating the grounding connection point as close as <br />practicable to the photovoltaic source better protects the <br />system from voltage surges due to lightning. <br /> <br />690.43 Equipment Grounding. <br /> <br />Exposed non-current carrying metal parts of module <br />frames, equipment, and conductor enclosures shall be <br />grounded in accordance with 250.134 or 250.136(A) <br />regardless of voltage. <br /> <br /> Table 690.31 (C) Correction Factors <br />Temperature Rating of Conductor Temperature <br /> <br />Temperature (°C) 60°C (140°F) <br />30 1.00 <br />31-35 0.91 <br />36-40 0.82 <br />41-45 0.71 <br />46~50 0.58 <br />51-55 0.41 <br />56-60 <br />61-70 <br />71-80 <br /> <br />75°C (167°F) 90°C(194°F) 105°C (221°F) ~ <br /> 1.00 1.00 1.00 86 <br /> 0.94 0.96 0.97 87-95 <br /> 0.88 0.91 0.93 96-104 <br /> 0.82 0.87 0.89 105-113 <br /> 0.75 0.82 0.86 114-122 <br /> 0.67 0.76 0.82 123-131 <br /> 0.58 0.71 0.77 132-140 <br /> 0.33 0.58 0.68 141-158 <br /> 0.41 0.58 159-176 <br /> <br />690.45 Size of Equipment Grounding Conductor. <br /> <br />Where not protected by the ground-fault protection <br />equipment required by 690.5, the equipment-grounding <br /> <br />78 <br /> <br /> <br />