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Joined: Oct 2000
Posts: 3,672 Likes: 4
OP
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How deep need EMT be under a cememt walk? Or, can the walk itself act as 'running boards' to protect it?
Also- does the extensive rusting of the EMT where the elbow enters the ground perhaps suggest that EMT might not be appropriate at all?
There was no grout- to expose the pipe, I simply needed to use a broom. Nor was the walk completely cut- it appears that someone simply put an abrasive blade in a circular saw, and made several passes, as deep as the saw would go.
- renosteinke ![[Linked Image]](https://www.electrical-contractor.net/Forum/Images/EMT-in-Walk.jpg)
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Joined: Nov 2001
Posts: 42
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EMT IS NOT SUPPOSED TO BE INSTALLED UNDERGROUND...
JBIELECTRIC EAST MEADOW NY
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Joined: Aug 2005
Posts: 89
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PVC
Rigid Nonmetallic Conduit (RNC)
Type UF cable (except in direct contact with poured concrete 340.12(8))
Rigid Metal Conduit (RMC)
Intermediate Metal Conduit (IMC)
can be used underground, plus anything else I left out that someone wants to chime in.
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Joined: Jan 2005
Posts: 5,483 Likes: 3
Cat Servant Member
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Considering the lack of depth, is this truly "under" ground? :-)
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Joined: Aug 2005
Posts: 89
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From most of the illustrations I've seen, they always placed the piping at least under the actual slab, not just a few inches from the top. It looks like dirt under there, I'd say remove as much as you can and get as deep as you can, then run it.
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Joined: Jul 2002
Posts: 8,450 Likes: 4
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Interesting picture John.
Putting metal conduit in damp soil is just asking for trouble.
Over here, we have a rule that states no underground cables, pipes or wires shall be buried less than 600mm (2ft) below grade.
With a plastic marking strip at half trench depth.
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Joined: May 2004
Posts: 116
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2002 NEC Table 300.5 give minimum cover requirements.
Depth depends on what you are using and what it is burried under.
Steve
PS - I would never us EMT underground and would rather use PVC (the electrical use gray, not the sprinkler white)and be sure to use the sweeping 90 degree PVC peices and not the "condulets"
Thanks
Steve
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Joined: Nov 2001
Posts: 42
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the wole picture is a hack.. that pedestrian walkway could be easily undermined why take all the time to cut it when you could just go under in half the time and it costs le$$
JBIELECTRIC EAST MEADOW NY
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Posts: 4,161
Joined: October 2000
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