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#125064 02/14/07 07:12 PM
Joined: Dec 2000
Posts: 4,289
Member
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]

#125065 02/14/07 07:38 PM
Joined: Feb 2002
Posts: 840
C
Member
Wow, that is really nasty. I can see some major firework potential there, especially if a ground fault occurs.


Peter
#125066 02/14/07 09:25 PM
Joined: Feb 2004
Posts: 1,438
Member
Only one tenant was missing a ground? Looks like they all are! [Linked Image]

#125067 02/15/07 12:44 AM
Joined: Feb 2003
Posts: 288
Y
Member
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 01:41 PM
Joined: Dec 2005
Posts: 866
Likes: 4
R
Member
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 02:21 PM
Joined: Jun 2005
Posts: 821
S
Member
YIKES!

#125070 02/16/07 09:31 PM
Joined: Sep 2006
Posts: 111
E
Member
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 11:41 AM
Joined: Mar 2004
Posts: 391
B
Member
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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