Changing pipe sizes

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arnettda

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I would like to use an existing 3" emt run for a project. The pipe is empty and I need to extend the run 40 feet. I do not have the cabibility to bend a off set or a kick in the 3 inch. I would like to use a 3" C condulet and reduce down to 1.5" coming out the other side. I do not have room for a pullbox if I use the 8X rule in sizing my box. Is this legal? And if it is legal what are your thoughts of doing it this way. It seems a little funky to me but I have no other options. Reruning the 1.5" is not a possibility. Thanks for your time. D
 
As long as the smaller pipe is large enough, it would be no different than using a pull-box.
 
arnettda said:
I would like to use an existing 3" emt run for a project. The pipe is empty and I need to extend the run 40 feet. I do not have the cabibility to bend a off set or a kick in the 3 inch. I would like to use a 3" C condulet and reduce down to 1.5" coming out the other side. I do not have room for a pullbox if I use the 8X rule in sizing my box. Is this legal? And if it is legal what are your thoughts of doing it this way. It seems a little funky to me but I have no other options. Reruning the 1.5" is not a possibility. Thanks for your time. D
Click to expand...

They do sell 3" EMT 45deg bends at the supply house, most have 22deg also.
 
Becareful here...if the wire is #4 or larger the same 8X rule as for junction boxes applies to the C fitting. There may be an out..if your C fitting is marked for the maximum number and size conductors, then you are good to go as long as the conductors are no bigger than what is marked on the fitting. Note to get out of the 8x rule, the size and number of conductors must be marked on the fitting itself by the manufacturer.
 
Will this work?

1. Find an adapter to go from 3" EMT to conduit. The conduit end could be male or female, and any size from 3" to 1 1/2". It could be an adapter normally used to go from EMT to a box which will have a male thread for a locknut. If it's female thread you can skip the coupling of Item 3.

2. Find a similar adapter for 1 1/2" EMT.

3. Select a conduit coupling or other fitting with bushing to accept the 1 1/2" EMT adapter of Item 2 on one end and the 3" EMT adapter from Item 1 on the other end.

4. Screw them all together tightly. Run an Equipment Grounding Conductor if you are concerned that the threads may not maintain continuity for a ground.
There is no box; therefore no Article 312 issue.

Just pull the conductors through, preferably from the small end.
 
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