Enter the offset distance, shrink amount, obstacle height, and bend angle into the calculator to determine the 3/4 EMT offset length. This calculator helps electricians to calculate the correct length of conduit needed to navigate around obstacles.
3/4 EMT Offset Formula
The following formula is used to calculate the 3/4 EMT offset length.
OL = (OH / tan(BA/2)) + (S * OH)
Variables:
- 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)
To calculate the 3/4 EMT offset length, divide the obstacle height by the tangent of half the bend angle, then add the product of the shrink amount and the obstacle height.
What is a 3/4 EMT Offset?
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.
How to Calculate 3/4 EMT Offset?
The following steps outline how to calculate the 3/4 EMT Offset Length.
- First, determine the obstacle height (OH) in inches.
- Next, determine the bend angle (BA) in degrees.
- Next, determine the shrink amount (S) in inches per inch of offset.
- Next, gather the formula from above = OL = (OH / tan(BA/2)) + (S * OH).
- Finally, calculate the 3/4 EMT Offset Length (OL) in inches.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
obstacle height (OH) = 6 inches
bend angle (BA) = 30 degrees
shrink amount (S) = 0.25 inches per inch of offset
