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Directly Buried EMT ? #125064
02/14/07 08:12 PM
02/14/07 08:12 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,271
Fullerton, CA USA
This, from Eddy Current

Quote
Got some pics of some nasty wiring I found in a crawlspace. I don't think I can post them myself. There are 5 x100a feeds and 4x 60a feeds for townhouses ran in EMT to flex that was buried running under a street. One tenant lost power and another complained about not having a ground - this is what I found - all live!



[Linked Image]


[Linked Image]


[Linked Image]


[Linked Image]

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Re: Directly Buried EMT ? #125065
02/14/07 08:38 PM
02/14/07 08:38 PM
C
CTwireman  Offline
Member
Joined: Feb 2002
Posts: 840
Connecticut, USA
Wow, that is really nasty. I can see some major firework potential there, especially if a ground fault occurs.


Peter
Re: Directly Buried EMT ? #125066
02/14/07 10:25 PM
02/14/07 10:25 PM
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Only one tenant was missing a ground? Looks like they all are! [Linked Image]

Re: Directly Buried EMT ? #125067
02/15/07 01:44 AM
02/15/07 01:44 AM
Y
yaktx  Offline
Member
Joined: Feb 2003
Posts: 288
Austin, Texas, USA
Yeesh. Relying on the conduit alone for a ground, the flex means there's about a 50/50 chance there was a low-impedance ground in the first place, before the corrosion. That's some scary stuff.

Re: Directly Buried EMT ? #125068
02/15/07 02:41 PM
02/15/07 02:41 PM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
Titirangi, Akld, New Zealand
Scary stuff those cables.

Most likely that most services fail the loop impedance test.


The product of rotation, excitation and flux produces electricty.
Re: Directly Buried EMT ? #125069
02/16/07 03:21 PM
02/16/07 03:21 PM
S
ShockMe77  Offline
Member
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
YIKES!

Re: Directly Buried EMT ? #125070
02/16/07 10:31 PM
02/16/07 10:31 PM
E
Eddy Current  Offline
Member
Joined: Sep 2006
Posts: 111
Ontario,Canada
Actually, it's rigid conduit, not emt. Was back there today with some big-wigs trying to decide what to do. Honestly I hope we don't get the job. The heat for these townhouses is a boiler system and the pipes also run from one townhouse to the next in the crawlspaces. It must be 40 degrees down there and this is in Canada where outside it's -20!(Celsius) Alot of the work will have to be done in the crawlspace and it's rat heaven!!!

Re: Directly Buried EMT ? #125071
02/17/07 12:41 PM
02/17/07 12:41 PM
B
BigJohn  Offline
Member
Joined: Mar 2004
Posts: 391
Boston, MA
How old is this? That's some ate-up rigid, by god. It looks like it's been sitting on a coastal shore-line for twenty years.

Makes me wonder if an awful lot of buried rigid ends up looking like this? How long does the galvanizing last? I rarely espouse the use of PVC, but this should've been schedual 80 if anything ever was.

-John

PS: EddyCurrent, if you end up in the crawl-space with the rats (and their droppings) get some respirators. That's nasty dust to be breathing.


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