How many inches should the bend allowance be for a 45° bend in EMT?

For a 45° bend in Electrical Metallic Tubing (EMT), the bend allowance is calculated based on the specific dimensions and properties of the conduit being utilized. Typically, a 45° bend requires less bend allowance compared to sharper bends, such as 90°, and the common values found in various reference materials suggest that the bend allowance may be calculated based on factors like the radius of the bend, the material, and the diameter of the conduit.

In EMT, the standard calculations often yield specific dimensions for different bending angles. The commonly utilized formulas or charts define these required measurements to ensure proper fit and function, particularly associated with routing and installation practices. The proper bend allowance for a 45° bend will, therefore, often be less than those commonly mentioned in the answer options provided.

As a result, the correct answer reflects that none of the suggested values (4, 6, or 8 inches) accurately represent the bend allowance for a 45° bend in EMT, leading to the conclusion that the correct choice is "None of the above." This approach emphasizes the importance of understanding the bending process and applying the correct technical standards for accurate electrical installation.