Non-power-limited circuits may be wired using which of the following?

• A. THHN in EMT
• B. THHN in PVC
• C. NM-B
• D. SE cable

Answer: (A)

Non‑power-limited circuits are typically run with individual conductors inside a protective raceway, so the conductors are well protected and easy to pull or replace. THHN is a common insulation type for these circuits because it’s rated for dry locations and works well in conduit. Using THHN inside an Electrical Metallic Tubing (EMT) raceway gives solid mechanical protection and a straightforward installation path, which is why this pairing is the standard choice for non‑power‑limited wiring.

NM‑B is a nonmetallic cable used mainly in residential wiring and isn’t designed for installation inside conduits like this. SE cable is older service/feeder cable and isn’t used for typical interior branch circuits in modern constructions. THHN in PVC could be used in conduit, but EMT is the conventional, more universally applicable option for these circuits, hence it’s the best answer.