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Old 04-03-2019, 10:52 PM   #1
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Default NM in sleeve on outside of house?

Running #6 NM cable from basement up to 2nd floor attic, and then @ 150' and down into a garage, ideally avoiding splices. The easiest way up to the attic is on the outside of the house: out wall above panel, LB & PVC & LB straight up and into the attic wall. I believe that's a violation, as the outside qualifies as a wet location. It doesn't seem fair though. Inside this PVC is the least likely place to get wet, ever. I'm know I'm answering my own question; just grumbling.
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Old 04-03-2019, 11:01 PM   #2
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I'd do it anyway. The NEC is a book of suggestions, not rules.
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Old 04-03-2019, 11:01 PM   #3
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I wouldn't really lose too much sleep over something like that. Burying itbin the ground would be one thing, but the type of install you suggest is pretty tame.
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Old 04-04-2019, 07:48 AM   #4
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Why would you use #6 romex?

#6 aluminum SER cable has the same ampacity and costs a lot less.

And as an added benefit can be compliantly used inside of the exterior conduit.

ETA- or it can just be run up the wall without the conduit.
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Old 04-04-2019, 04:38 PM   #5
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Quote:
Originally Posted by HackWork View Post
Why would you use #6 romex?

#6 aluminum SER cable has the same ampacity and costs a lot less.

And as an added benefit can be compliantly used inside of the exterior conduit.

ETA- or it can just be run up the wall without the conduit.
6 romex and 6 aluminum SER are NOT the same ampacity!! 6 romex is 60 amp. 6 alum. is 50 amp.
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Old 04-04-2019, 04:55 PM   #6
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6 romex and 6 aluminum SER are NOT the same ampacity!! 6 romex is 60 amp. 6 alum. is 50 amp.
#6 romex is not good for 60A, you are not allowed to use #6 romex if the load is going to be 60A. You can use a 60A breaker only because there is no standard 55A breaker, but the load has to be 55A or less.

If you need 60A, then you use #4 aluminum SER cable which is still much cheaper than #6 romex.
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Old 04-05-2019, 01:17 AM   #7
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I got a red tag for sleeving NM...above ground.

It came out of the house into a 3/4" LB down about
4' of schedule 40 pvc and then I used a jake to turn into
the side of an AC disco for central air.

Inspector made me set a JB in the basement ceiling and
transfer over to thhn. Bastahd!
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Old 04-12-2019, 12:09 PM   #8
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Inspectors around here donít call that for a violation when in vertical runs from an attic down to a box. I run #6 Romex from the panel direct to the soffit and down a conduit into a hub on top of a hot tub disconnect all the time. There is no water accumulation in that event.

Horizontal runs are different because if water is in the conduit then the wire is straight up laying in the water.




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Old 04-12-2019, 12:21 PM   #9
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Quote:
Originally Posted by mikewillnot View Post
Running #6 NM cable from basement up to 2nd floor attic, and then @ 150' and down into a garage, ideally avoiding splices. The easiest way up to the attic is on the outside of the house: out wall above panel, LB & PVC & LB straight up and into the attic wall. I believe that's a violation, as the outside qualifies as a wet location. It doesn't seem fair though. Inside this PVC is the least likely place to get wet, ever. I'm know I'm answering my own question; just grumbling.
Inside any raceway on the outside is subject to condensation which builds up on the inside. I agree, to some degree, with those who feel the vertical run is not an issue however a vertical run from the top of a panel could cause water dripping into the panel from the condensation.

In NC then made an amendment that allows 6'

Quote:
300.9 Raceways in Wet Locations Above grade.
Where raceways are installed in wet locations
above grade, the interior of these raceways shall be
considered to be a wet location. Insulated
conductors and cables installed in raceway in wet
locations above grade shall comply with
310.10(C).

Exception: The raceway shall not be considered a
wet location if:
(1) The section of raceway routed in a wet
location above grade does not exceed 1.8 m
(6 ft) in length;
(2) Any fittings or conduit bodies are watertight
and listed for use in wet locations; and
(3) All termination points of the raceway are
only open in any of the following:
a. A dry location;
b. Equipment suitable for outdoor use; or
c. Equipment listed for use in a wet
location.
My feeling is if you sleeve the wire from a crawl space up to an exterior panel there should not be an issue. This has been done in NC for as long as I have been working here- over 40 years.
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Old 04-12-2019, 05:24 PM   #10
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Quote:
Originally Posted by Dennis Alwon View Post
...however a vertical run from the top of a panel could cause water dripping into the panel from the condensation.

If that was truly a concern, then SE/SER should have the same restriction.


In fact all cables should be prohibited from vertically run exterior raceways that enter the top of an enclosure


Wait a minute, we'd have the exact same issue with individual conductors.









At any rate, I think you can tell that I wouldn't be worried.
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Old 05-11-2019, 10:09 PM   #11
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[OP] - the sleeve would be open at each end, one in the basement and the other in the attic; from the basement exit to the attic entry points, it would be outdoors. No end of the sleeve would connect to a panel or enclosure of any kind. Any condensation in the outside run would drain out onto the basement floor. there might actually be air circulation from one end to the other.



Actually, I might have run into the same situation (upcoming) with a run of SER.
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