ABSTRACT
Photovoltaic (PV) is growing fast, and the PV material in the National Electric Code (NEC) is changing faster than anything the NEC has seen since the days of Thomas Edison and Nikola Tesla hashing it out over direct current vs alternating current. The NEC is updated every three years with a new Code cycle. This edition of Photovoltaic Systems and the National Electric Code reflects the 2017 NEC and will discuss earlier versions of the NEC. When the 2020 NEC comes out, this material will not be obsolete; in fact more than half the PV in the United States (US) is installed in places that adopt the NEC three years after a Code is released. For instance, the state with half of the solar in the US is California, and in California, the 2017 NEC is adopted in 2020 and used until the 2020 NEC is adopted in 2023.
