Component Operation in a Solar Photovoltaic System
The provisions of Art. 690 apply to solar photovoltaic (PV) electrical energy systems, including the array circuit(s), inverter(s), and controller(s) for such systems.
A blocking _____ is used to block reverse current flow into a PV source circuit.
a) resistor
b) potentiometer
c) diode
d) all of the above
See answer and applicable Code reference
The correct answer is: c) diode
The provisions of Art. 690 apply to solar photovoltaic (PV) electrical energy systems, including the array circuit(s), inverter(s), and controller(s) for such systems. As noted in the definitions section of this Article, a blocking diode "is used to block reverse flow of current into a photovoltaic source circuit."
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.
