Which of the following wiring methods is commonly used for residential branch circuits?

• A. Type AC cable
• B. Type MC cable
• C. Type NM cable
• D. Type UF cable

Answer: (C)

The identification of Type NM cable as the correct answer stems from its widespread usage in residential settings for branch circuits. Type NM cable, also known as Non-Metallic sheathed cable or Romex, is favored for its flexibility, ease of installation, and cost-effectiveness. It is typically used in dry interior locations, making it highly suitable for standard residential applications.

Type NM cable consists of conductors that are insulated and encased in a non-metallic sheath, which provides adequate protection against environmental conditions typically found in homes. Its design also allows for direct installation within walls, ceilings, and floors without the need for additional conduit, which simplifies the installation process.

In contrast, other wiring methods, while appropriate in certain situations, are not as commonly utilized for residential branch circuits. For example, Type AC cable includes metal sheathing, which is more prevalent in commercial environments or where additional physical protection is required. Type MC cable is also a metal-clad option but is typically used in scenarios where flexibility and additional protection are necessary, such as in industrial settings. Type UF cable is specifically designed for underground installations or direct burial applications, limiting its use in typical residential branch circuits that are found within structures.

Thus, Type NM cable stands out as the most