Putting Romex in conduit is not recommended by industry experts and the National Electric Code. Here are some potential issues that could occur:
Difficulty pulling the Romex through the conduit due to the larger diameter of the cable and the tight space within the conduit.
The insulation on the Romex can be damaged during installation, which could cause electrical safety hazards.
Increased heat buildup within the conduit due to the lack of adequate air flow around the cable. This can lead to damage to the cable and increase the risk of fire.
In addition, using conduit with Romex is generally unnecessary as Romex is designed to be used as a standalone cable and already has appropriate insulation and protection for normal use. If conduit is required for certain installations, it is best to use individual wires instead of Romex. Overall, it is important to follow proper electrical installation and safety procedures to avoid potential risks and hazards.