2003 APRIL - Laserfiche WebLink

20.20.027 disconnecting means of the other tified for such operation. source(s) at any distribution equip- ment on the premises, provided that VIII. Storage Batteries all of the following conditions are met: 690.71 Installation. (1) Each source interconnection shall be made at a dedicated circuit breaker or fusible disconnecting means. (2) The sum of the ampere ratings of over current devices in circuits supplying power to a busbar or conductor shall not exceed the rat- ing of the busbar or conductor. (A) General. Storage batteries in a solar photovoltaic system shall be installed in accordance with the provisions of Article 480. The inter- connected battery cells shall be con- sidered grounded where the photo- voltaic power source is installed in accordance with 690.41. (B) Dwellings. Exception: For a dwelling unit, the (1) Operating Voltage. Storage bat- sum of the ampere ratings of the teries for dwellings shall have the over current devices shall not ex- cells connected so as to operate at ceed 120 percent of the rating of less than 50 volts, nominal. the busbar or conductor. Exception: Where live parts are not (3) The interconnection point shall accessible during routine battery be on the line side of all ground- maintenance, a battery system volt- fault protection equipment. age in accordance with 690.7 shall be permitted. Exception: Connection shall be permitted to be made to the load (2) Guarding of Live Parts. Live side of ground fault protection, parts of battery systems for dwellings provided that there is ground fault shall be guarded to prevent acciden- protection for equipment from all tal contact by persons or objects, groundfault current sources. regardless of voltage or battery type. (4) Equipment containing over cur- rent devices in circuits supplying power to a busbar or conductor shall be marked to indicate the presence of all sources. Exception: Equipment with power supplied from a single point of connection. (5) Equipment such as circuit breakers, if backfed, shall be iden- FPN: Batteries in solar photovol- taic systems are subject to exten- sive charge-discharge cycles and typically require frequent mainte- nance, such as checking electrolyte and cleaning connections. (C) Current Limiting. A listed, cur- rent-limiting, over current device shall be installed in each circuit adjacent to the batteries where the available short-circuit current from a 710-29 (Pleasanton April 2003)