emt in concrete

Status
Not open for further replies.
N

nukeantz

Member
Is there a reason why I can not run emt in a concrete slab? Fitting are listed as suitable for concrete, the emt is galvanized.
thanks
 
I got turned down today by the inspector for installing 2 conduits out to a cashwrap (1 for data and 1 for power to the cashwrap) it was just from the wall out 10'. I just needed another opinion before I call him tomorrow.

Thanks
 
Is this on grade? Most state or local rules prohibit EMT from being installed in concrete that is in contact with earth.
 
Yes, I cut a trench in the concrete going out to the cashwrap. It is basically laying on top of the gravel that is under slab when the slab was originally pored.
 
Around here most inspectors would fail this. 358.10 B judged suitable for the condition then 90.4. 358.12 (3) not the same but close (subject to permanent moisture).
 
IMO just a bad idea, it rots quick in concrete... Besides there are cheaper/easier methods that do last longer... PVC - Smurf (ICK - did I say that?)
 
From the UL White Book for EMT.
Galvanized steel electrical metallic tubing installed in concrete on grade or above generally requires no supplementary corrosion protection. Galvanized steel electrical metallic tubing in concrete slab below grade level may require supplementary corrosion protection.
In general, galvanized steel electrical metallic tubing in contact with soil requires supplementary corrosion protection. Where galvanized steel electrical metallic tubing without supplementary corrosion protection extends directly from concrete encasement to soil burial, severe corrosive effects are likely to occur on the metal in contact with the soil.
Click to expand...
 
We, as a practice just do not use EMT in slab on grade pours.
PVC is a better application.
If you are under a driveway, Make sure what ever you use has the proper burial depth
 
Status
Not open for further replies.
Top