Which type of wire is commonly used for residential electrical wiring?

• A. SOOW wire
• B. Non-metallic sheathed cable (NM)
• C. Coaxial cable
• D. Single-strand wire

Answer: (B)

Non-metallic sheathed cable, commonly known as NM cable or Romex, is widely used for residential electrical wiring because it is designed specifically for indoor applications where it can be installed within walls, ceilings, and floors. This type of cable consists of two or more insulated conductors and often includes a bare ground wire, all encased in a protective plastic sheath.

The benefits of NM cable include its affordability, ease of installation, and flexibility, making it ideal for most homes. It is suitable for both general-purpose circuits and specific applications like lighting and outlets. Additionally, NM cable is rated for various ampacity levels, accommodating the needs of different circuits in a residential setting.

The other types of wiring mentioned have specific uses that do not align with typical residential electrical needs. For instance, SOOW wire is designed for industrial and outdoor applications due to its rugged construction and durability. Coaxial cable is used for transmitting cable television signals and internet data but is not suited for powering electrical devices. Single-strand wire is usually applied in low-voltage applications and may not meet the safety and code requirements for standard residential wiring, making it less practical for household circuits.