Where may you use nonmetallic-sheathed cable?

• A. In outdoor settings
• B. Inside floors and walls
• C. In exposed areas
• D. In underground applications

Answer: (B)

Nonmetallic-sheathed cable, commonly known as NM cable, is widely utilized within residential and certain commercial structures primarily due to its ease of installation and flexibility. The correct application for this type of cable includes installation within floors, walls, and ceilings of buildings. This setting protects the cable from environmental factors like moisture and mechanical damage, which can be encountered in outdoor or exposed areas.

When installed inside walls and floors, NM cable can be run without concerns about the potential corrosive effects of the elements. However, it is important to remember that while NM cable is suitable for these applications, it is not permitted for use in areas that are subject to moisture, such as outdoor settings or underground locations, which require more robust types of wiring to ensure safety and compliance with electrical codes.

This specific use aligns with electrical codes, which emphasize safety and performance under various conditions, ensuring that wiring installations are not only efficient but also safe for residential and permitted commercial environments.