A utility-scale wind farm has 100 turbines, each with a rated power of 2 MW. The turbines are interconnected to a substation through a 34.5 kV transmission line. What is the minimum conductor size required for the transmission line, according to Article 694.63(A) of the 2026 NEC?
- A500 kcmil
- B750 kcmil
- 1000 kcmil
- D1250 kcmil
Exam tip
Always refer to the specific NEC tables for conductor sizing based on current requirements.
Why C is correct
Article 694.63(A) requires that the conductor size be sized to carry the maximum current expected, which is the total rated power of the turbines divided by the voltage. The calculation is 200,000 kW / 34.5 kV = 5,782.05 A. Using Table 310.16, the minimum conductor size for 5,782.05 A is 1000 kcmil.