For what purpose is EMT (Electrical Metallic Tubing) commonly used?

Electrical Metallic Tubing (EMT) is primarily used for indoor wiring in commercial and industrial buildings due to its lightweight, durability, and corrosion resistance. EMT serves as an effective conduit for protecting electrical wires while offering structural support and grounding capabilities. Its smooth inner surface reduces friction, making it easier for cables to be pulled through, and its ability to be easily bent by hand or with a tool allows for flexible installation in complex electrical layouts.

While EMT can be used in various applications, it is particularly favored in environments that require a robust yet economical solution for wiring. The design of EMT also enables it to seamlessly connect with other types of conduits and fittings, making it ideal for the intricate setups often found in commercial and industrial settings. This versatility and compliance with electrical codes for protecting wiring systems further highlight why it is the preferred choice for indoor applications.

The other options suggest uses of EMT that are less suitable; for instance, while EMT might be employed outdoors, it typically requires additional protection from environmental exposure. Moreover, it is generally not recommended for underground work without additional insulating devices due to potential moisture retention and the need for corrosion protection. Similarly, low voltage applications may not necessitate the protective qualities EMT offers, as other conduit types could suffice.