Fill through a small condut/cable/knockout entry

[iwire]

...IMHO, the conduit fill is based on the smallest diameter conduit in the run (box to box), regardless how many transitions are made or how short they are.

I agree, but sections under 24" can be treated at 60% fill instead of 40% fill.

 

[jusme123]

I think in the OPs case the reducer is directly secured to the enclosure so the length of the reduced part is likely less than 1" long.


That said there is no prohibition in changing conduit size in the middle of a run as long as the conduit fill requirements are maintained.

..my point was that he did not install a 'nipple' as it would apply in using the 60% fill.

 

[jusme123]

I agree, but sections under 24" can be treated at 60% fill instead of 40% fill.

his run does not qualify for the 60%

 

[roger]

We specify, in our spec, a minimum of 3/4" conduit,
Jason

I know this is not addressing the topic but, why do many designers think there is a need to specify 3/4" as the minimum conduit size? Seems to me it is a waste of natural resources. Conductor ampacity corrections come into play the same regardless of the size conduit used. Once I install the fourth CCC in any size conduit I have to apply a correction factor.

Then take into consideration that these same specs usually limit the number of CCC's to three anyways.

Do designers expect maximum fill in all these conduits?

Roger