Which material is commonly used for non-metallic boxes?

Non-metallic boxes are predominantly made from plastic materials. This choice is correct because plastic offers several advantages in electrical applications.

Plastic is lightweight, corrosion-resistant, and does not conduct electricity, making it a safer option for enclosing electrical connections. It also allows for easier installation and is less expensive compared to metal options. Non-metallic boxes are often used in residential and commercial applications for wiring and device mounting, particularly in environments where moisture may be a concern, as plastic is less susceptible to rust and deterioration over time.

In contrast, aluminum, copper, and steel are metallic materials that are typically used for different types of electrical enclosures but are not suitable for non-metallic boxes. These metals are more prone to corrosion, can conduct electricity (creating potential hazards), and generally offer different benefits suited for applications where a metallic structure is required, such as enhanced strength or grounding capabilities.