Romex in conduit attached to an enclosure (indoors), fastening requirements

Can somebody point me to the section of code that says you can install Romex in conduit or raceway??

Thanks
Any of the conduit articles 3XX.22, for example EMT

358.22 Number of Conductors. The number of conductors
shall not exceed that permitted by the percentage fill
specified in Table 1, Chapter 9.
Cables shall be permitted to be installed where such use
is not prohibited by the respective cable articles. The number
of cables shall not exceed the allowable percentage fill
specified in Table 1, Chapter 9.
 
Besides the referenced 358; 334.15(B) states the following, that it would be required when some sort of protection is needed, that can include EMT or other conduit:
2023NEC 334.15(B) Protection from Physical Damage.
Cable shall be protected from physical damage where necessary by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC conduit, RTRC marked with the suffix -XW, or other approved means. Where passing through a floor, the cable shall be enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC conduit, RTRC marked with the suffix -XW, or other approved means extending at least 150 mm (6 in.) above the floor. Conduit or tubing shall be provided with a bushing or adapter that provides protection from abrasion at the point the cable enters and exits the raceway.
 
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