Is it legal to use Romex in a commercial building?

Is it legal to use Romex in a commercial building, it depends on building type and local code, but generally Romex NM-B cable is not allowed in commercial buildings in many jurisdictions, with NEC allowing limited use in certain commercial occupancies but many local codes and building types require MC cable or conduit, with commercial use restricted. NEC allows NM cable in commercial buildings under specific conditions, such as in one story commercial buildings of certain construction types, but prohibits in buildings over three stories, in dropped ceilings used as plenum without proper rating, and in many commercial occupancies where code requires more protected wiring method, with most commercial buildings requiring MC metal clad cable, AC armored cable, or THHN in conduit for fire safety and durability. In Chicago, Romex not allowed in commercial at all, requiring conduit. In many cities, commercial garages, theaters, and assembly occupancies prohibit NM. So is it legal to use Romex in commercial building, sometimes yes in small single story commercial of type III, IV, V construction per NEC 334, but generally no, commercial buildings typically require MC or conduit, with inspectors often disallowing Romex in commercial, with best practice to use MC cable or conduit in commercial for code compliance and safety, so check local code, but in most commercial Romex not permitted or not practical, with residential Romex primarily for homes.