A school district is installing new electrical raceways in a classroom. The raceway is 1-inch PVC conduit. What is the maximum number of 14-gauge THHN conductors that can be installed in the conduit?
- A10 conductors
- B12 conductors
- C15 conductors
- 18 conductors
Exam tip
Be familiar with the conduit fill tables in the NEC for various conduit types and sizes.
Why D is correct
According to 2026 NEC Article 318.10, 1-inch PVC conduit can contain 18 14-gauge conductors. The correct answer is 18 conductors.