Generally, No.Here's why: Romex (NM cable) is designed for dry locations. Conduit can trap moisture and condensation, which is detrimental to Romex and can cause it to fail or become a shock hazard. Romex is not designed to be pulled through conduit. The outer jacket of Romex is not as durable as the individual conductors used in THHN/THWN wire, which is what is typically used in conduit. Pulling Romex through conduit can damage the outer jacket, exposing the wires. The NEC (National Electrical Code) prohibits using NM cable in wet or damp locations. This includes conduit systems that are likely to accumulate moisture.

Exceptions

There are very limited situations where running a short section of NM cable through conduit might be permitted, if the conduit is used solely for physical protection. It is not very common and is used in very short sections (think, a couple of feet). The key considerations are: The conduit is installed in a dry location. The conduit is used only to protect the cable from physical damage. The conduit is accessible. You are following manufacturer's instructions for the cable and conduit.

Important Considerations

Always consult your local electrical codes and a qualified electrician before doing any electrical work. Local codes may be more restrictive than the NEC. If you need to run wiring in a location that may be wet or damp, use the appropriate type of wiring (e.g., THHN/THWN in conduit, UF cable). If you need to protect NM cable, consider using a protective cover specifically designed for NM cable rather than conduit.

In summary, while there might be very rare exceptions for short runs where the conduit is purely for physical protection in a dry location, the general answer is NO, it is not code-compliant to run Romex in conduit or raceway. Flag for review