Concrete encased emt

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Rob1221

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Hello all, looking at section 12-1400 (EMT) it says its ok to put into concrete. Your thoughts on this, we are installing boxes in concrete wall system. 1st for me but the specs just say conduit. What have you done/used? Thanks
 
We install EMT in concrete quite often. There are advantages and disadvantages to using it in concrete. If it can be installed so that it won't be damaged during the pour then it's okay to use.

Welcome to the Forum. :)
 
We install EMT in concrete quite often. There are advantages and disadvantages to using it in concrete. If it can be installed so that it won't be damaged during the pour then it's okay to use.

Welcome to the Forum. :)
Thanks for the replys, as for the boxes could I get away with a 4x4 & mudring (duct tape it up) or do you prefer the masonry boxes
 
Thanks for the replys, as for the boxes could I get away with a 4x4 & mudring (duct tape it up) or do you prefer the masonry boxes
We use both types. For single gang applications with one device the masonry box is fine. If you're looking to pipe from one box to another than either a 4" or 4 11/16" box with a mud ring would be better.
 
The only issue I've been aware of is the rust or deterioration at the point of where the emt leaves the encased tomb of concrete to the outside elements, typically wrapping those points with 50 mil tape or similar insulates that issue of concrete to air transition.
 
Screenshot_20230716-163735.png

Some fittings may say they are listed for concrete, but if you read the instructions, they are only able to be in concrete if you tape them.
 
Article 100
Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth; in loca- tions subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations ex- posed to weather.
 
Article 100
Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth; in loca- tions subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations ex- posed to weather.

But nothing in the NEC prohibits EMT in wet locations. NY has an amendment that does.
 
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