Conduit reducer mid-stream?

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jimsway4now

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One of our electrical designers ask me if a buried 3" RGS conduit could be reduced to 2" RGS mid-stream. I didn't have a code answer for him other than the wire must be sized for the 2" conduit in the raceway.

Does anyone have a solid answer for his question?
 

tom baker

First Chief Moderator
Staff member
Re: Conduit reducer mid-stream?

As long as the conduit is sized per the wire fill in chapter 9, its "ok", but not a good idea, esp if the raceway is 3" on each end, the assumption would be made later its 3" all the way.
The cost is in the labor to open the ditch and pull the wire. Don't see the savings with reducing to 2". Can you use PVC?
 
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