For PV systems, a(n) _____ is a device that changes direct-current input to an alternating-current output.
a) diode
b) rectifier
c) transistor
d) inverter
See answer and applicable Code reference
The correct answer is: d) inverter
The provisions of Art. 690 apply to solar PV electrical energy systems. As noted in the definitions Section [690.2], an inverter is defined as: "Equipment that is used to change voltage level or waveform, or both, of electrical energy. Commonly, an inverter [also known as a power conditioning unit (PCU) or power conversion system (PCS)] is a device that changes DC input to an AC output. Inverters may also function as battery chargers that use alternating current from another source and convert it into direct current for charging batteries."
About the Author
Mike Holt
Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.