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20.20.027 cuit is matched to the voltage rating and charge current requirements of the interconnected battery cells and the maximum charging current multi- plied by 1 hour is less than 3 percent of the rated battery capacity ex- pressed in ampere-hours or as recom- mended by the battery manufacturer. All adjusting means for control of the charging process shall be accessi- ble only to qualified persons. (3) Circuits Using Inverters. The requirements in 690.72(B)(2) shall not apply to ac or do circuits using inverters to control the battery charging process by feeding power into the utility system. These cir- cuits, used in several modes, shall be sized and protected as required in 690.8. 690.74 Battery Interconnections. FPN: Certain battery types such as Flexible cables, as identified in Arti- valve-regulated lead acid or nickel cle 400, in sizes 2/0 AWG and larger cadmium can experience thermal shall be permitted within the battery failure when overcharged. enclosure from battery terminals to a nearby junction box where they shall (B) Diversion Charge Controller. be connected to an approved wiring method. Flexible battery cables shall (1) Sole Means of Regulating Charg- also be permitted between batteries ing. A photovoltaic power system and cells within the battery enclo- employing a diversion charge con- sure. Such cables shall be listed for troller as the sole means of regulat- hard service use and identified as ing the charging of a battery shall be moisture resistant. equipped with a second independent means to prevent overcharging of the IX. Systems Over 600 Volts battery. 690.80 General. (2) Circuits with Direct Current Di- version Charge Controller and Diver- Solar photovoltaic systems with a sion Load. Circuits containing a do maximum system voltage over 600 diversion charge controller and a do volts do shall comply with Article diversion load shall comply with the 490 and other requirements applica- following: ble to installations rated over 600 volts. (1) The current rating of the diver- sion load shall be rated at least 150 percent of the current rating of the diversion charge controller. (2) The conductor ampacity and the rating of the over current device for this circuit shall be at least 150 percent of the maximum current rating of the diversion charge con- troller. 690.85 Definitions. For the purposes of Part IX of this article, the voltages used to deter- mine cable and equipment ratings are as follows. Battery Circuits. In battery circuits, the highest voltage experienced un- 710-31 (Pleasanton April 2003)