ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

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


Member
Registered: 12/24/00
Posts: 4259
Loc: 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!












Top
Tools for Electricians:
#125065 - 02/14/07 04:38 PM Re: Directly Buried EMT ?
CTwireman Offline
Member
Registered: 02/07/02
Posts: 840
Loc: Connecticut, USA
Wow, that is really nasty. I can see some major firework potential there, especially if a ground fault occurs.
_________________________
Peter
Top
#125066 - 02/14/07 06:25 PM Re: Directly Buried EMT ?
Lostazhell Offline
Member
Registered: 02/21/04
Posts: 1428
Loc: Bakersfield, CA (Originally Or...
Only one tenant was missing a ground? Looks like they all are!
Top
#125067 - 02/14/07 09:44 PM Re: Directly Buried EMT ?
yaktx Offline
Member
Registered: 02/19/03
Posts: 288
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.
Top
#125068 - 02/15/07 10:41 AM Re: Directly Buried EMT ?
RODALCO Offline
Member
Registered: 12/08/05
Posts: 854
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.
Top
#125069 - 02/16/07 11:21 AM Re: Directly Buried EMT ?
ShockMe77 Offline
Member
Registered: 06/11/05
Posts: 821
Loc: Rahway, New Jersey
YIKES!
Top
#125070 - 02/16/07 06:31 PM Re: Directly Buried EMT ?
Eddy Current Offline
Member
Registered: 09/26/06
Posts: 111
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!!!
Top
#125071 - 02/17/07 08:41 AM Re: Directly Buried EMT ?
BigJohn Offline
Member
Registered: 03/06/04
Posts: 391
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.

-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.
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 84 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals