What type of raceway is described in Article 386?

Article 386 of the National Electrical Code (NEC) focuses on Surface Metal Raceways (SMR). These raceways are designed primarily to provide a protective and accessible means of wiring, enabling electrical conductors to be routed along surfaces such as walls and ceilings without the need for more extensive installation methods like conduit or embedded wiring.

Surface Metal Raceways are typically used in commercial and industrial applications where flexibility, accessibility, and the ability to design around existing structures are required. They come in various configurations and are often installed in environments where wiring needs to be visible and easily maintained.

The article outlines specific requirements regarding the installation, grounding, and bonding of Surface Metal Raceways, ensuring that they adhere to safety standards and function effectively in protecting electrical conductors. This makes Surface Metal Raceways a crucial component in wiring systems where accessibility and protection are priorities.

Nonmetallic Extensions, Busways, and Cellular Concrete Floor Raceways describe different types of raceways or wiring methods but are not the focus of Article 386. Each of these has its own set of code articles addressing specific applications and requirements, separate from those governing Surface Metal Raceways.