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Posted by RBM on April 7, 2007, 8:45 am
I question the same thing. It looks like EMT to me. While EMT can be
installed in concrete, it generally cannot be used as an underground
conduit. If it is in wet ground under that slab, it may have all
disintegrated, and would need to be replaced. The most important thing would
be the system ground. Be sure that the conduits are not being used as the
grounding conductor, and if they are, pull new ground conductors through
them. Once your grounding is confirmed and adequate, you could possibly
sleeve a length of PVC over the metal conduit to protect what's left of it
>
>>
>> >> I have two rigid metal electrical conduits that came off the concrete
>> >> slab
>> >> along the exterior wall. One is next to the AC unit and one is next
>> >> to
>> >> the
>> >> swimming pool filter and pump. The one next to the pool filter is an
>> >> often
>> >> wet area and the wires are exposed as seen here:
>> >>
>> >> http://i173.photobucket.com/albums/w67/143house/exterior/P1000932.jpg
>> >>
>> >> close up:
>> >>
>> >> http://i173.photobucket.com/albums/w67/143house/exterior/P1000933.jpg
>> >>
>> >> The conduit next to the AC unit has not broken off yet but will be
> soon,
>> >> it
>> >> is all corroded at the bottom:
>> >>
>> >> http://i173.photobucket.com/albums/w67/143house/exterior/P1000931.jpg
>> >>
>> >> close up:
>> >>
>> >> http://i173.photobucket.com/albums/w67/143house/exterior/P1000930.jpg
>> >>
>> >> Any suggestion how to fix that? Do I need to chip out the slab and
> make
>> >> a
>> >> hole to replace the conduit? or is there some sort of a mender to fix
>> >> this
>> >> kind of situation.
>> >>
>> >> Thanks in advance,
>> >>
>> >> MC
>> >
>> > i think no electrical box is permitted at your point of damage, and
>> > your pictures show there is extensive damage. your electrician will
>> > evaluate the job and replace the full run from the nearby panel with
>> > appropriate gfci as required in your local ordinance.
>> > there may be hidden damage as well of wire corrosion that may reach
>> > toward the panel requiring a new breaker.
>> > he will determine the required limits for the path of the new conduit
>> > based on your local code.
>> >
>> > general info at:
>> > http://www.faqs.org/faqs/electrical-wiring/part1/preamble.html
>> >
>> >
>> >
>> Thanks. But the nearby panel is 75 feet away on the other side of this
>> concrete wall. Most of the runs are in rigid metal conduits either in
>> the
>> ceiling or inside walls, then it comes through the foundation out of the
>> slab to service the AC or the pool pump. So this is really at the very
> end
>> of the run where this exposed portion is damaged. The wires themselves
>> seems fine, I don't think it is practically to run a new conduit from the
>> garage all the way to this same location. There has to be some sort of
>> repair kits?
>>
>> MC
>
>
> Is that rigid conduit or EMT? I don't think that I have ever seen rigid
> corrode like that. Regardless, I am not aware of any quick fix repair
> kit.
> It is likely that water is inside the pipe and that the part under the
> slab
> is corroded as well. Is the conduit being used as a grounding conductor
> or
> is there a grounding conductor wire in the conduit? If the conduit is the
> grounding conductor, then it is probably not effective right now. I
> suggest
> that you cut back the conduit to where it is still good and install a
> junction/pull box and run new conduit using PVC.
>
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