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Joined: Mar 2003
Posts: 849
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511.9
If a conduit does Not pass thur a Classified
area sealing is Not required.
See page 771 Exhibit 511.1.
If a conduit comes from Outside the building goes up to 28inches then enters a box inside a poured concrete wall it never enters the classified area. Thus Seal not required.
Whatca think??
Same as example on page 771 but conduit comes from outside & stays inside the outer wall.
Yoopers

2017 / 2014 NEC & Related Books and Study Guides
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IMHO, you are correct, no seal required.


John
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Done???


John
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It sounded pretty done to me but you probably still need some duct seal to prevent the cold air, condensation thing. That is not a real seal off tho.


Greg Fretwell
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Thanks guys it just what I figured ,

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Just got written up by Local Inspector for doing it.
Guess 90.4 comes into play!
Yoopersup

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It all gets down to what is "inside". (which side of the wall is the border).
I can put my "flush mounted jelly jar" hat on and see his point. We call the outside wall the border there and let them use Romex to a dry location octagon box.
He must be saying the conduit is traveling through the classified location, inside the wall.


Greg Fretwell
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I take Yoops job from the OP as the box and conduit being encased in a poured concrete wall. I can't see how that can be 'in' the classified area, also with the dimensions he posted.

On that thought, unprotected service conductors encased in 2" of concrete are 'outside the structure'. Although Yoop did not provide wall thickness dimensions, or a conduit size. it sounds like it could be 2"+ encased in poured concrete.



John
Joined: Mar 2003
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Right he says even thought its in 2 inches Concrete coming from outside its in classified area. I disagree. \
Conduit comes below ground up Outside poured wall to Panel.
I know this area was revised in 2005 but I didn;t find that deleted??
Yoopersup

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