- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
I know the code says UF can't be embedded in poured concrete but what about behind stone? The stone will have a mesh wire backing and mortar behind & between the stones,
I dont recall off hand what the code says but the situation you describe is not "embedded in poured concrete".I know the code says UF can't be embedded in poured concrete but what about behind stone? The stone will have a mesh wire backing and mortar behind & between the stones,
Where are you wanting to install the cable? You said the stone will have mortar behind & between the stone and you also asked about installing it behind the stone. Would that be behind the stone in the mortar or below the mortar?I know the code says UF can't be embedded in poured concrete but what about behind stone? The stone will have a mesh wire backing and mortar behind & between the stones,
It would go on an outside wall. There is a mesh screen that goes on to help hold the mortar, then some mortar, then the stone with mortar between the stone. The UF would go over the mesh before any mortar is applied.Where are you wanting to install the cable? You said the stone will have mortar behind & between the stone and you also asked about installing it behind the stone. Would that be behind the stone in the mortar or below the mortar?
That section applies to heating cables as well as the non heating leads as you mention but not to UF or other general wiring methods.The code says "in poured cement except as permitted in 424.43" and that section deals with non-heating leads of heating cables. Mortar is not poured concrete so embedding the cable in the mortar behind the stone seems to be permitted.
I also agree. Mortar is typically "cast in place". What is allowed is to drill a hole through the concrete, mortar, etc. after it is cured and then install the cable.(2015) 340.12(8) prohibits UF "Embedded in poured cement, concrete, or aggregate". To me that prohibits the proposed installation.
I take the word "poured" there to mean "cast in place", versus running through a chase in a precast member, e.g. a concrete block. And mortar is just concrete without the coarse aggregate, more or less. The proposed installation is definitely embedded in a cast-in-place cementitious material.
Now if you have the thickness to cover the the UF with a barrier before applying the mortar, then I would say it is not embedded, and you'd be fine.
Cheers, Wayne
The customer wants a receptacle on the opposite side of the covered porch on a post. There is a receptacle on the outside wall that will be surrounded by the stone. I was wanting to feed the other receptacle from it.Just curious, what are you feeding? Lights, receptacles, just passing through?
Sure it is, for a sufficiently broad understanding of the word "poured" as "cast-in-place". Mortar is just cement and fine aggregate.Mortar is not poured cement, concrete, aggregate or plaster.
Sorry Wayne but mortar for the application that Bill is asking about is not poured.Sure it is, for a sufficiently broad understanding of the word "poured" as "cast-in-place". Mortar is just cement and fine aggregate.
Cheers, Wayne