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20.20.027 Interruption. The ground-fault pro- tection device or system shall be capable of detecting a ground fault, interrupting the flow of fault current, and providing an indication of the fault. (B) Disconnection of Conductors. The ungrounded conductors of the faulted source circuit shall be auto- matically disconnected. If the grounded conductors of the faulted source circuit are disconnected to comply with the requirements of 690.5(A), all conductors of the fault- ed source circuit shall be opened automatically and simultaneously. Opening the grounded conductor of the array or opening the faulted sec- tions of the array shall be permitted to interrupt the ground-fault current path. (C) Labels and Markings. Labels and markings shall be applied near the ground-fault indicator at a visible location, stating that, if a ground fault is indicated, the normally grounded conductors may be ener- gized and ungrounded. 690.6 Alternating-Current Modules. (A) Photovoltaic Source Circuits. The requirements of Article 690 per- taining to photovoltaic source cir- cuits shall not apply to ac modules. The photovoltaic source circuit, conductors, and inverters shall be considered as internal wiring of an ac module. (B) Inverter Output Circuit. The out- put of an ac module shall be consid- ered an inverter output circuit. (C) Disconnecting Means. A single disconnecting means, in accordance with 690.15 and 690.17, shall be permitted for the combined ac output of one or more ac modules. Addi- tionally, each ac module in a multi- ple ac-module system shall be pro- vided with a connector, bolted, or terminal type disconnecting means. (D) Ground-Fault Detection. Alter- nating-current-module systems shall be permitted to use a single detection device to detect only ac ground faults and to disable the array by removing ac power to the ac mod- ule(s). (E) Over current Protection. The output circuits of ac modules shall be permitted to have over current pro- tection and conductor sizing in ac- cordance with 240.5(B)(2). II. Circuit Requirements 690.7 Maximum Voltage. (A) Maximum Photovoltaic System Voltage. In a do photovoltaic source circuit or output circuit, the maxi- mum photovoltaic system voltage for that circuit shall be computed as the sum of the rated open-circuit voltage of the series connected photovoltaic modules corrected for the lowest expected ambient temperature. For 710-17 (Pleasanton April 2003)