How are electrical conductors categorized in Article 690?

The categorization of electrical conductors in Article 690 primarily focuses on the function and the context in which they are used in photovoltaic (PV) systems. In this framework, conductors are specifically classified into two main types: PV source circuit conductors and output conductors.

PV source circuit conductors are the wires that connect the individual photovoltaic modules or strings of modules. They play a critical role in collecting and carrying the direct current (DC) produced by the modules before it is sent onward for conversion and use.

Output conductors, on the other hand, transport the DC power from the inverter to the electrical system of the building or to the point of interconnection. This distinction is essential in ensuring that the conductors are properly rated, protected, and meet the requirements set forth by the NEC for safety and efficiency within solar photovoltaic installations.

The other choices do not accurately reflect the specific divisions outlined in Article 690, as they either generalize the types of conductors or use terms that are not relevant in the context of photovoltaic systems. Hence, recognizing the specific roles of PV source circuit conductors and output conductors is fundamental for compliance with the NEC and for the safe operation of solar power systems.