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(4) Equipment containing over current devices in <br />circuits supplying power to a busbar or conductor shall <br />be marked to indicate the presence of all sources. <br />Exception: Equipment with power supplied from a <br />single point of connection. <br />(5) Equipment such as circuit breakers, if backfed, shall <br />be identified for such operation. <br /> <br />VIII. Storage Batteries <br /> <br />690.71 Installation. <br /> <br />(A) General. Storage batteries in a solar photovoltaic sys- <br />tem shall be installed in accordance with the provisions of <br />Article 480. The interconnected battery cells shall be con- <br />sidered grounded where the photovoltaic power source is <br />installed in accordance with 690.41. <br /> <br />(B) Dwellings. <br /> <br />(1) Operating Voltage. Storage batteries for dwellings shall <br />have the cells connected so as to operate at less than 50 <br />volts, nominal. <br /> <br />Exception: Where live parts are not accessible during <br />routine battery maintenance, a battery system voltage in <br />accordance with 690.7 shall be permitted. <br /> <br />(2) Guarding of Live Parts. Live parts of battery systems <br />for dwellings shall be guarded to prevent accidental contact <br />by persons or objects, regardless of voltage or battery type. <br /> <br />FPN: Batteries in solar photovoltaic systems are subject to <br />extensive charge-discharge cycles and typically require <br />frequent maintenance, such as checking electrolyte and <br />cleaning connections. <br /> <br />(C) Current Limiting. A listed, current-limiting, over <br />current device shall be installed in each circuit adjacent to <br />the batteries where the available short-circuit current from a <br />battery or battery bank exceeds the interrupting or with- <br />stand ratings of other equipment in that circuit. The instal- <br />lation of current-limiting fuses shall comply with 690.16. <br /> <br />83 <br /> <br /> <br />