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20.20.027 Photovoltaic Systems Voltage. The direct current (dc) voltage of any photovoltaic source or photovoltaic output circuit. For bipolar or multi- wire installations, the Photovoltaic systems voltage is the highest volt- age between any two do conductors. Solar Cell. The basic photovoltaic device that generates electricity when exposed to light. Solar Photovoltaic System. The total components and subsystems that, in combination, convert solar energy into electrical energy suitable for connection to a utilization load. Stand-Alone System. A solar photo- voltaic system that supplies power independently of an electrical pro- duction and distribution network. 690.3 Other Articles. Wherever the requirements of other articles of this Code and Article 690 differ, the requirements of Article 690 shall apply and, if the system is operated in parallel with a primary source(s) of electricity, the require- ments in 705.14, 705.16, 705.32, and 705.43 shall apply. 690.4 Installation. (A) Solar Photovoltaic System. A solar photovoltaic system shall be permitted to supply a building or other structure in addition to any ser- vice(s) of another electricity supply system(s). (B) Conductors of Different Systems. Photovoltaic source circuits and pho- tovoltaic output circuits shall not be contained in the same raceway, cable tray, cable, outlet box, junction box, or similar fitting as feeders or branch circuits of other systems, unless the conductors of the different systems are separated by a partition or are connected together. (C) Module Connection Arrange- ment. The connections to a module or panel shall be arranged so that removal of a module or panel from a photovoltaic source circuit does not interrupt a grounded conductor to another photovoltaic source circuit. Sets of modules interconnected as systems rated at 50 volts or less, with or without blocking diodes, and having a single over current device shall be considered as asingle-source circuit. Supplementary over current devices used for the exclusive pro- tection of the photovoltaic modules are not considered as over current devices for the purpose of this sec- tion. (D) Equipment. Inverters or motor generators shall be identified for use in solar photovoltaic systems. 690.5 Ground-Fault Protection. Roof-mounted do photovoltaic arrays located on dwellings shall be provid- ed with do ground-fault protection to reduce fire hazards. (A) Ground-Fault Detection and (Pleasanton April 2003) 710-16