Solar Energy Systems - The NEC and PV Systems
Solar PV systems must be installed in accordance with Article 690 of the National Electric Code, which specifically deals with PV systems, as well as several other articles of the NEC that pertain to electrical systems in general. When there is a conflict between NEC 690 and any other article, NEC 690 takes precedence due to the unique nature of PV systems.
Articles of the NEC applicable to PV systems are:• NEC 690 – Solar Photovoltaic Systems
• NEC 230 – Disconnect Means
• NEC 240 – Overcurrent Protection
• NEC 250 – Grounding
• NEC 300 to NEC 384 – Wiring Methods
A good summary of NEC 690 (2002) is given in Photovoltaics: Design and Installation Manual (Solar Energy International 2007) in the chapter titled “System Wiring.” NEC 690 includes requirements on sizing, selecting and installation of wiring, conduit, overcurrent protection, disconnects, and grounding. NEC 690 addresses many other issues as well, such as interconnection to the utility grid, equipment listing, and inspection.
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