Running power in an existing slab 3 ft to a new kitchen island.

[ActionDave]

Under building would mean under slab, Yes?

I always thought so until I saw iwire's post. Even if you take his tack on it there is no need to dig a ditch in the kitchen.

 

[ActionDave]

Yes, I guess.

However the OP is asking about running pipes in a slab which is not underground so none of 300.5 applies.

If none of 300.5 applies why is there the row labelled Under a Building"?

Consider this, how would we run pipes in slabs on upper floors if this was not the case?

Those would not be under the building they would be in the building.

 

[iwire]

If none of 300.5 applies why is there the row labelled Under a Building"?

Those would not be under the building they would be in the building.

Under a building would be underground.

In a slab on the ground is not underground.

 

[GoldDigger]

Under a building would be underground.

In a slab on the ground is not underground.

Under a building can also be above ground if the building is in stilts. (The situation has come up regarding service conductors.)
And it would be considered by rule to be inside the building too.
(Requiring a very short run or encasing in concrete.)

 

[ActionDave]

Under a building would be underground.

And in that case the min. cover is 0 inches. I think we agree, just some mix up in the translation between cowboy and Yankee.

In a slab on the ground is not underground.

Good. I sure would hate for the OP to have to get a trencher in the kitchen.

 

[pjholguin]

Here in New Mexico we cannot use ENT per NM State Electrical Code.

Ent some csll it dmurf tube. I understand it to be ran in residential slabs . Its like flex but pvc type material

 

[ActionDave]

Under a building can also be above ground if the building is in stilts. ....

OOOOhhhh. Never thought of that.

 

[Sierrasparky]

When cutting concrete on grade make sure the slab is not a tension cable type. Cutting into one of those is dangerous and expensive.

 

[Smart $]

When cutting concrete on grade make sure the slab is not a tension cable type. Cutting into one of those is dangerous and expensive.

Unless there is a potential for sinkholes in the immediate area (from natural or man-made causes), I fail to understand why anyone would use cable-tension slab on grade.

 

[John120/240]

When cutting concrete on grade make sure the slab is not a tension cable type. Cutting into one of those is dangerous and expensive.

Unless there is a potential for sinkholes in the immediate area (from natural or man-made causes), I fail to understand why anyone would use cable-tension slab on grade.

Could living in a area prone to earth quakes be a factor ? idk

 

[wwhitney]

Unless there is a potential for sinkholes in the immediate area (from natural or man-made causes), I fail to understand why anyone would use cable-tension slab on grade.

My understanding is that the most common reason is building on expansive soils, which I know are common in some parts of California and Texas. I guess you could consider that a form of sinkholes.

Cheers, Wayne

 

[infinity]

I might use PVC jacketed MC in a shallow chase covered with some sort of patching material.