Box mounting through stucco

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merk09

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Could someone help me find the distance required that a box pass through the foam/stucco/mud to meet code. The inspector (new guy) is requiring that the box pass through the foam .25".. until this inspection, boxes had to be at least .25 from the surface of the foam to flush.. be it 3/4" to 1.5" in thickness the box had to be .25 from surface. He insists that if it doesn't pass through the foam the stucco will crack. Any help would be Thanks All.
 

Dennis Alwon

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merk09 said:
Could someone help me find the distance required that a box pass through the foam/stucco/mud to meet code. The inspector (new guy) is requiring that the box pass through the foam .25".. until this inspection, boxes had to be at least .25 from the surface of the foam to flush.. be it 3/4" to 1.5" in thickness the box had to be .25 from surface. He insists that if it doesn't pass through the foam the stucco will crack. Any help would be Thanks All.

I don't think this is an electrical code issue. Perhaps a building code issue. Seems like one could silicone the perimeter of the box and be good.
 

Dennis Alwon

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Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
celtic said:
???

314.20

I am aware of 314.20 but the op is talking about a code on stucco. I thought the op was saying his box was set 1/4" back and the inspector would not accept it. They also make box extenders but I don't think that is what the op is asking.
 

Wes G

Senior Member
Electrical Technology Instructor

Electrical Technology Instructor

merk09 said:
Could someone help me find the distance required that a box pass through the foam/stucco/mud to meet code. The inspector (new guy) is requiring that the box pass through the foam .25".. until this inspection, boxes had to be at least .25 from the surface of the foam to flush.. be it 3/4" to 1.5" in thickness the box had to be .25 from surface. He insists that if it doesn't pass through the foam the stucco will crack. Any help would be Thanks All.

Seems to me that you've gotten someone who is trying to make a point of who's boss! 312.3 and 314.20 both address the isue of maximum setbackfrom the surface, but there is no code, either building or electrical to my knowlege, that requires a certain depth of penetration.

What happens if I have a sandwich wall with plaster on both sides?Would I than be required to chissel out 1/4 inch of plaster on the wall opposite my box? Talk about recipies for cracked plaster!
 
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