Which type of wire is typically used for residential branch circuits?

For residential branch circuits, NM-B (Non-Metallic) cable is the standard choice due to its design and suitability for various applications within the home. NM-B cable consists of multiple conductors insulated with non-metallic sheathing, making it ideal for environments where it is not exposed to physical damage.

This type of cable is lightweight, flexible, and easy to install, which is particularly beneficial when running wires in walls, ceilings, and floors. NM-B is also recognized for its efficiency in meeting the National Electrical Code (NEC) requirements for residential wiring, offering a safe and reliable means to distribute electricity throughout a home.

In comparison, other types of cable such as TW, THHN, and MC are more specialized and serve different purposes. TW is used primarily for low-voltage applications and is not typically utilized for branch circuits. THHN is suited for high-heat applications and for use in conduit systems, rather than as open wiring for residential use. MC cable, while robust and suitable for some installations, is often more expensive and used in commercial or industrial settings where additional protection against physical damage is required.

Thus, NM-B cable's combination of convenience, safety, and compliance with electrical codes positions it as the most appropriate choice for