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Non-metallic sheathed cable, commonly known as NM cable or Romex, can indeed be used in buildings of type III, IV, and V construction. This type of cable is designed for residential and light commercial applications, making it suitable for various building types where the structural elements are primarily wood or metal studs.
Type III construction involves brick, masonry, or concrete walls with a wood or metal framing structure, while Type IV is characterized by heavy timber construction. Type V construction consists of entirely wood-framed buildings. In all these types of construction, non-metallic sheathed cable is permitted by code as it provides the necessary protection for conductors and meets the requirements for fire and electrical safety.
The appropriateness of using non-metallic sheathed cable is primarily due to its suitability for dry, interior locations, and it is widely accepted in residential wiring applications, thereby supporting electrical systems in these constructions without compromising safety or code compliance.