What is a key characteristic of Nonmetallic Extensions?

Nonmetallic extensions are characterized by being often flexible and lightweight, making them highly versatile in various installation scenarios. This flexibility allows for easier routing and installation in tight spaces or irregular layouts, which can be particularly advantageous in residential and commercial wiring applications. The lightweight nature of nonmetallic materials also contributes to ease of handling and reduces the overall burden on support structures.

The other characteristics noted in the options do not align with the primary attributes of nonmetallic extensions. For instance, these extensions do not provide a channel for metal wiring, as they typically serve a different purpose related to nonmetallic conductors. They are also not specifically designed for outdoor use, although some nonmetallic products can be rated for outdoor installations. Lastly, while nonmetallic extensions may connect to various raceways, this is not the key characteristic that defines them. Their flexibility and lightweight nature stand out as their most notable benefits in the context of electrical installations.