When installing flex conduit, what is the trade size of the largest available flex conduit?

When considering the trade sizes available for flexible conduit, the largest standard size is typically 4 inches. Flexible conduit, commonly used in electrical installations, is available in various trade sizes to accommodate different needs for wiring and protection. A 4-inch conduit provides ample space to house larger gauge conductors or multiple cables, making it practical for applications where larger conductors are required.

While other sizes exist up to 6 inches in certain specialty types or applications, they are not classified as flexible conduit in the same standard sense. This means that for commonly used flexible conduit, the trade size of 4 inches represents the largest standard size recognized and widely installed.