Which conduit installations are permitted by the NEC® when installed through wooden studs?

The National Electrical Code (NEC) outlines specific guidelines for conduit installations, including those that pass through wooden studs. When considering the types of conduit permitted for this installation, both Electrical Metallic Tubing (EMT) and Rigid Metal Conduit (RMC) are suitable options.

EMT is often chosen for its lightweight nature and ease of installation, while RMC offers additional physical protection due to its heavier and more robust structure. Both of these conduits can effectively protect the wiring, making them compliant with NEC requirements for installations that go through wooden studs, where there may be a risk of damage to the wires.

Using EMT or RMC in such installations ensures durability, safety, and adherence to code standards concerning mechanical protection, grounding, and bonding. The NEC allows these two types of conduit because they meet the necessary criteria for performance and safety when installed in specific environments, including being embedded in wooden structures like studs.

The other types of conduits mentioned, such as PVC, are typically used in different applications or environments, particularly where moisture resistance is more critical than mechanical protection. Thus, they would not be included in the correct answer regarding installations through wooden studs.