EATDIRT
Member
- Location
- SE Wisconsin
Can I use EMT (encased in concrete)for floor boxes encased in concrete?
EMT in concrete
- Thread starter EATDIRT
- Start date
- Status
masterinbama
Senior Member
- Location
- Huntsville Alabama
In slabs above grade yes you can.
Actually you can use it in direct contact with earth if you meet the requirements of 358.10(B)
Roger
earlejohnson
Member
- Location
- ga.
code please
masterinbama
Senior Member
- Location
- Huntsville Alabama
True, once again I let local code enter into the mix.
jaylectricity
Senior Member
- Location
- Massachusetts
- Occupation
- licensed journeyman electrician
Do they sell the pipe and fittings with corrosion protection, or is that something you add by spraying on a substance or something similar?
kwired
Electron manager
- Location
- NE Nebraska
Is galvanized coating not corrosion protection?
macmikeman
Senior Member
- Location
- Planet macmikeman
For slab on grade, we used to coat the emt with lap seal and pass. We used to tape using 3M electrical tape and that passed inspection as well, but it sure took longer. This was back in the day that pvc was the new thing that was having a bit of a hard time catching on with the inspectors... I haven't used emt at grade level in a long time.
jaylectricity
Senior Member
- Location
- Massachusetts
- Occupation
- licensed journeyman electrician
I've seen that on RMC for underground services, but is regular EMT galvanized? I'm not even sure, that's why I asked the question.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Is there a reason your not using PVC ?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
"Not in my neighborhood."
kwired
Electron manager
- Location
- NE Nebraska
If it were not galvanized it would be rusty before you even pick it up at supply house.
paul
Senior Member
- Location
- Snohomish, WA
From Wheatland's website
So yes, it is galvanized, but not enough for corrosion protection.
Wheatland said:
So yes, it is galvanized, but not enough for corrosion protection.
kwired
Electron manager
- Location
- NE Nebraska
Galvanizing is corrosion protection, without any galvanizing EMT would rust very easily just like any other non coated steel. It apparantly does not have enough galvanizing for protection from continuous contact with soil, or other places where saturated material will collect. GRC and IMC will rust also like in underground installations, they have a thick enough wall that unless severe corrosive conditions are present the outer layer of rust plus the galvanizing help keep the rest of the thickness from rapid deterioration. EMT has a thin enough wall that it doesn't take nearly as long to deteriorate to a point that it is totally compromised. JMO.
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