What is the maximum allowable size for an E.M.T.?

The maximum allowable size for an Electrical Metallic Tubing (E.M.T.) is 4 inches. This specification is important as it ensures that the conduit is capable of safely housing electrical wiring while complying with electrical codes and regulations. A 4-inch diameter allows for sufficient space to accommodate multiple wires or large cables, which is often essential in commercial and industrial settings.

E.M.T. is typically used for its durability, ease of installation, and ability to protect electrical conductors from physical damage. Additionally, adhering to the size regulations is crucial for maintaining proper grounding and bonding practices, which are integral for electrical safety. The other sizes, while potentially useful for different applications, exceed the maximum size stipulated for E.M.T., thereby rendering them unsuitable for this specific use case.