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EMT for Underground Services #1590
05/17/01 01:11 AM
05/17/01 01:11 AM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
In our area most underground services were once installed using EMT. The conduits are all in need of replacement now. Is this the same situation everywhere? Just Curious.

[Linked Image]

[Linked Image]
Bill

Work Gear for Electricians and the Trades
Re: EMT for Underground Services #1591
05/17/01 07:26 AM
05/17/01 07:26 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Bill,
The UL white book says: "In general, galvanized steel EMT in contact with soil requires supplementary corrosion protection."
The utility in this area does not permit EMT for services. Most are PVC with some rigid and a very few IMC.
Don(resqcapt19)


Don(resqcapt19)
Re: EMT for Underground Services #1592
05/17/01 09:12 AM
05/17/01 09:12 AM
M
Merritt  Offline
Member
Joined: Apr 2001
Posts: 21
Miami, Fl, USA
Here in miami, when its underground, we use (for most residential services)a 2" Rigid down pipe (it has to go down 2 feet) the cable in the down pipe is either direct burial triplex, or its sheathed in 2" sch. 40 PVC back to the pole. in some places i have seen that 2" rigid pipe rust pretty badly.. thats what you get for having a water table 6-8 feel below the ground

-m


Remember when you read my posts, im only 17, still learning... "Hey, its takes what it takes!"
Re: EMT for Underground Services #1593
05/17/01 10:58 AM
05/17/01 10:58 AM
W
wayne  Offline
Member
Joined: Apr 2001
Posts: 54
NC
Bill,

Here in NC I have seen that a time or too. In this field there is never a dull moment,and just when you think you have seen it all bam here we go again.
Even though we try to do our best at the time of installation. There are always beter materials and methodology being developed all the time.
It's always interesting to see these types of situlation. It gives us a better insight of what we all can or may encounter in our field.
[Linked Image]
Wayne

Re: EMT for Underground Services #1594
05/17/01 01:53 PM
05/17/01 01:53 PM
S
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,371
Up here in the green mountains the earth is all bones, remnants of some ancient meteor no doubt.
So direct burial is usually frowned on, most of what i see is in pvc , once in a while rigid

[Linked Image]

Re: EMT for Underground Services #1595
05/17/01 03:01 PM
05/17/01 03:01 PM
M
Mike  Offline
Member
Joined: Feb 2001
Posts: 62
Here in the evergreen state, EMT is not used if it will be in direct contact with the earth. Also can't use it for an aboveground service raceway.

Re: EMT for Underground Services #1596
05/17/01 04:10 PM
05/17/01 04:10 PM
Bill Addiss  Offline OP
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
Was EMT ever approved for this use?
Every underground residential service I've seen from, say 30 years ago was done in this way (and looks like this). We've got a whole lot of pipes to replace here.

Bill

Re: EMT for Underground Services #1597
05/17/01 04:32 PM
05/17/01 04:32 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I hate to say it, but here in the Mountain State, if it had a circular cross section, it was used as a raceway. I've had to turn down a few re-connects because of EMT being used. EMT was never approved here in WV for contact with the earth, but, since no one ever said "nope" for a long time, it was used.


Few things are harder to put up with than the annoyance of a good example.
Re: EMT for Underground Services #1598
05/17/01 04:59 PM
05/17/01 04:59 PM
M
Mike  Offline
Member
Joined: Feb 2001
Posts: 62
I'm guessing, but I think it was the early eighties when it was banned. The reason they banned it for service raceway was because people were only hand-tightening the EMT compression couplings and connectors. Guess they were too lazy to reach for their channel locks!

Re: EMT for Underground Services #1599
05/17/01 05:22 PM
05/17/01 05:22 PM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Very common on old work around here. I have replaced lots of these with PVC....usually after repairing the UG that was damaged by the collapsing, rusted emt.

GJ

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