System Grounding. For a photovoltaic power source, one conductor
of a two-wire system with a photovoltaic system voltage over 50
volts and the reference (center tap) conductor of a bipolar
system shall be solidly grounde3d or shall use other methods
that accomplish equivalent system protection in accordance with
250.4(A) and that utilize equipment listed and identified for
the use. Exception: Systems complying with 690.35. Point of
System Grounding Connection. The dc circuit grounding connection
shall be made at any single point on the photovoltaic output
circuit. Equipment Grounding. Exposed non-current carrying metal
parts of module frames, equipment, and conductors enclosures
shall be grounded in accordance with 250.134 or 250.136(A)
regardless of voltage. Size of Equipment Grounding Conductor.
Where not protected by the ground-fault protection equipment
required by 690.5, the equipment-grounding conductor for
photovoltaic source and photovoltaic output circuits shall be
sized for 125 percent of the photov