3/4 EMT Offset Calculator

Formula

To calculate the 3/4 EMT offset length:

\[ OL = \frac{OH}{\tan(\frac{BA}{2})} + (S \cdot OH) \]

Where:

\( OL \) is the offset length (inches)
\( OH \) is the obstacle height (inches)
\( BA \) is the bend angle (degrees)
\( S \) is the shrink amount (inches per inch of offset)

3/4 EMT Offset Definition

A 3/4 EMT offset is a bend in electrical metallic tubing (EMT) that allows the conduit to bypass an obstacle such as a wall or a beam. The offset is created by making two bends in the conduit at a specified angle. The length of the offset is determined by the height of the obstacle and the angle of the bends, taking into account the shrinkage that occurs during the bending process.

Example Calculation

Let's assume the following values:

Obstacle Height (OH) = 10 inches
Bend Angle (BA) = 30 degrees
Shrink Amount (S) = 0.5 inches per inch of offset

Using the formula:

\[ OL = \frac{10}{\tan(\frac{30}{2})} + (0.5 \cdot 10) \approx 42.32 \]

The 3/4 EMT offset length is approximately 42.32 inches.