As an example, to bend 3/4" EMT conduit have a free end height of 8.5", the table indicates to subtract 6" from the 8.5" which. 3. From the back edge of the 90° stub-up bend, measure the distance found in step 1 and make your mark on the conduit. 4. Place the bender on the conduit with the bender's hook facing the free end of the.. Adding 1/2 the "deduct" would result in a bend that is a little short. I originally figured the gain to deduct ratio when it should have been the (deduct minus gain) to deduct ratio. The calculated add amount is 54-55% of "deduct" value when bending 1/2" and 3/4" EMT in a typical hand bender: 2.7" and 3.3" respectively.
Reverse Method To Bend A 90 Degree With EMT. Working with 10-foot conduit sections can get tricky, especially for stubs over 60 inches. The reverse bending method offers a clever solution for these scenarios. This method is also used in back to back 90 degree bends. When using the reverse method the take up deduction is no longer needed. This.. EMT Electrical Conduit 90-Degree Bend Deduction Chart This chart gives you the deductions for 1/2", 3/4", and 1" bender sizes. Deduct numbers are dependent on the bender, and while these numbers are by far the most common, it is possible that your bender may be different.