A residential addition requires the installation of a geothermal heating and cooling system. The system includes an outdoor unit and an indoor unit. What is the minimum size of the disconnect required for the outdoor unit, according to 2026 NEC Article 440.9(A)?
- A100A
- B150A
- 200A
- D250A
Exam tip
Be aware of the specific requirements for disconnects in geothermal systems as outlined in the NEC.
Why C is correct
According to 2026 NEC Article 440.9(A), the minimum size of the disconnect required for an outdoor unit of a geothermal heating and cooling system is 200A. Options a, b, and d are not the correct minimum size for this application.