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Old 02-24-2012, 11:56 PM   #1
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Rigid - Gain - Offset - Calculation


I'm new with Rigid conduit and I don't know how to calculate the gain with two box offsets with a larger offset at 30 degrees with 1/2 inch Rigid. I know how to calculate gain on a 90 degree bend but not on a larger offset. I need to know the pre-measurement so I can thread and cut a stick of rigid. I would have looked in my level one but I won't have it on me any time soon.

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Old 02-25-2012, 04:42 PM   #2
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Rigid - Gain - Offset - Calculation


?
http://www.cefga.org/documents/BendingRaceways.pdf

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Old 02-25-2012, 06:08 PM   #3
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Have you looked up any of the books by my old hero Jack benfield?
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Old 02-25-2012, 07:20 PM   #4
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Thx plummen, found a petty good website from jack benfield.
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Old 02-25-2012, 07:31 PM   #5
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No problem,he was actually one of the guys responsible for giving us that wonderfull material called emt
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Old 02-25-2012, 07:36 PM   #6
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Rigid - Gain - Offset - Calculation


The outside diameter of 1/2" rigid is pretty close to 3/4" emt,Id be willing to bet you could use the same formula as bending 3/4" emt to figure it.
Its been a long time since I had to bend much rigid pipe,we used to use it in explosion prone areas like grain elevators and soy bean processing plants when I was young and ambitious,I dont miss bending and trying to install that stuff myself!
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Old 02-25-2012, 07:57 PM   #7
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Quote:
Originally Posted by Aggressor View Post
I'm new with Rigid conduit and I don't know how to calculate the gain with two box offsets with a larger offset at 30 degrees with 1/2 inch Rigid. I know how to calculate gain on a 90 degree bend but not on a larger offset. I need to know the pre-measurement so I can thread and cut a stick of rigid. I would have looked in my level one but I won't have it on me any time soon.
offset bends shrink.get electricians guide to conduit bending by RICHARD A COX.

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