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conductor for photovoltaic source and photovoltaic output <br />circuits shall be sized for 125 percent of the photovoltaic- <br />originated short-circuit currents in that circuit. Where <br />protected by the ground-fault protection equipment <br />required by 690.5, the equipment-grounding conductors for <br />photovoltaic source and photovoltaic output circuits shall <br />be sized in accordance with 250.122. <br /> <br />690.47 Grounding Electrode System. <br /> <br />(A) Alternating-Current Systems. If installing an ac system, <br />a grounding electrode system shall be provided in <br />accordance with 250.50 through 250.60. The grounding <br />electrode conductor shall be installed in accordance with <br />250.64. <br /> <br />(B) Direct-Current Systems. If installing a dc system, a <br />grounding electrode system shall be provided in accordance <br />with 250.166 for grounded systems or 250.169 for un- <br />grounded systems. The grounding electrode conductor shall <br />be installed in accordance with 250.64. <br /> <br />VI. Marking <br /> <br />690.51 Modules. <br /> <br />Modules shall be marked with identification of terminals or <br />leads as to polarity, maximum over current device rating <br />for module protection, and with the following ratings: <br /> <br />(1) <br />(2) <br />(3) <br />(4) <br />(5) <br />(6) <br /> <br />Open-circuit voltage <br />Operating voltage <br />Maximum permissible system voltage <br />Operating current <br />Short-circuit current <br />Maximum power <br /> <br />690.52 Alternating-Current Photovoltaic Modules. <br /> <br />Alternating-current modules shall be marked with identifi- <br />cation of terminals or leads and with identification of the <br />following ratings: <br /> <br />(1) Nominal operating ac voltage <br /> 79 <br /> <br /> <br />