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In 2017, Article 690 of the National Electric Code (NEC) was updated, which tells solar designers, engineers, and installers how to ensure that a PV (solar energy) system will operate safely. Specifically, changes were made to how the NEC applies to system disconnects, which is what we’ll look at in this article. How Does the …
Understanding Rule 21 in California & Beyond Rule 21 Solar: What Is It? Rule 21 Solar is an interconnection tariff that was originally adopted in 1982 by the CPUC (California Public Utilities Commission), as a means of controlling distributed generators that are hooked up to the electric grid. The CPUC is the regulatory body that regulates …