What is the main benefit of using non-metallic sheathed cable in residential wiring?

Using non-metallic sheathed cable in residential wiring provides several significant advantages, which is why selecting "all of the above" reflects an accurate understanding of its overall benefits.

First, non-metallic sheathed cable, commonly referred to as NM cable or Romex, typically comes at a lower cost compared to metal conduit systems. This cost-effectiveness makes it a popular choice for residential applications, enabling homeowners and contractors to save on materials without compromising the quality of the electrical system.

Second, this type of cable is designed with a sheathing that provides a reasonable level of resistance to moisture. While it’s important to note that it's not entirely waterproof, its moisture-resistant properties help to protect the insulated conductors from damage in typical residential environments, thereby enhancing safety and durability.

Third, the installation process for non-metallic sheathed cable is generally simpler and more straightforward than that of alternatives like metal conduit. This simplicity saves time and labor during installation, making it easier for electricians to run wiring in various spaces and navigate around obstacles.

These combined benefits of lower cost, moisture resistance, and ease of installation not only make non-metallic sheathed cable advantageous in residential settings but also contribute to its widespread preference among electricians and builders.