A residential photovoltaic (PV) system has a total of 100 PV modules, each with a rated power of 300 W. The inverter has a rated input power of 80 kW. What is the minimum conductor size required for the PV array output, according to Article 690.61(A)(1) of the 2026 NEC?
- A10 AWG
- B8 AWG
- 6 AWG
- D4 AWG
Exam tip
Always refer to the specific NEC tables for conductor sizing based on current requirements.
Why C is correct
According to Article 690.61(A)(1), the conductor size for the PV array output must be sized to carry the maximum current expected, which is the inverter's rated input power divided by the module's rated power. The calculation is 80,000 W / 300 W/module = 266.67 A. Using Table 310.16, the minimum conductor size for 266.67 A is 6 AWG.