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#125064 - 02/14/07 04:12 PM Directly Buried EMT ?
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
This, from Eddy Current

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!

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#125065 - 02/14/07 04:38 PM Re: Directly Buried EMT ?
CTwireman Offline

Registered: 02/07/02
Posts: 839
Loc: Connecticut, USA
Wow, that is really nasty. I can see some major firework potential there, especially if a ground fault occurs.

#125066 - 02/14/07 06:25 PM Re: Directly Buried EMT ?
Lostazhell Offline

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
Only one tenant was missing a ground? Looks like they all are!

#125067 - 02/14/07 09:44 PM Re: Directly Buried EMT ?
yaktx Offline

Registered: 02/19/03
Posts: 286
Loc: 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.

#125068 - 02/15/07 10:41 AM Re: Directly Buried EMT ?

Registered: 12/08/05
Posts: 862
Loc: 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.

#125069 - 02/16/07 11:21 AM Re: Directly Buried EMT ?
ShockMe77 Offline

Registered: 06/11/05
Posts: 823
Loc: Rahway, New Jersey

#125070 - 02/16/07 06:31 PM Re: Directly Buried EMT ?
Eddy Current Offline

Registered: 09/26/06
Posts: 112
Loc: 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!!!

#125071 - 02/17/07 08:41 AM Re: Directly Buried EMT ?
BigJohn Offline

Registered: 03/06/04
Posts: 352
Loc: 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.


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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