Existing Conduit Fill

[cvirgil467]

I seem to remeber the NEC relaxed conduit fill requirements when reusing existing conduit. I cannot seems to locate the requiremenst in the 2008 NEC edition.

Thanks.
c

 

[hardworkingstiff]

I've never heard that, and I started in 1972.

But, I was never a code guru either.

 

[kwired]

I seem to remeber the NEC relaxed conduit fill requirements when reusing existing conduit. I cannot seems to locate the requiremenst in the 2008 NEC edition.

Thanks.
c

Why would they do that? The size of the raceway has not changed and neither has the conductors. (outside of any deterioration that may have occurred since original install)

 

[cvirgil467]

I may be thinking of the old NYC Electrcial Code requirements.

 

[jumper]

NYC electrical code amendments are provided online by the city government.

http://www.nyc.gov/html/dob/downloads/bldgs_code/electrical_code_local_law_39of2011.pdf

 

[infinity]

NYC used to have a 50% fill for existing conduits. That went away long ago.

 

[kwired]

NYC used to have a 50% fill for existing conduits. That went away long ago.

40% is hard enough to pull sometimes.

 

[fmtjfw]

Ancient

Ancient

The new versus existing fill rules go way back, I'm thinking in the 1960's. I have a vague recollection that I read this in the basement shop of my father's house when I was a teenager.

 

[don_resqcapt19]

Many years ago there was a 25% fill limit for new work and 40% limit for re-work. I am not sure when that was changed to just 40% for all applications. It was before I started in 73, but how much before, I don't know.