What type of metal conduit is considered the thinnest walled?

The type of metal conduit that is considered the thinnest walled is Electrical Metallic Tubing (EMT). EMT is known for its lightweight and easy-to-handle design, making it an ideal choice for various electrical installations where structural integrity is not critically compromised by wall thickness. This conduit type is typically used in dry locations for both indoor and outdoor installations because it provides good protection against physical damage while being flexible enough for easier bends and adjustments.

EMT's thinner wall allows for cost-effective installations and simpler handling compared to other metal conduits with thicker walls, such as Rigid Metal Conduit and Intermediate Metal Conduit, which are designed for more demanding environments requiring higher durability and strength. Flexible Metal Conduit also has its specific applications but is not classified under the same criteria as EMT regarding wall thickness. Overall, EMT’s attributes make it a popular choice among electricians for non-combustible systems in commercial and residential buildings.