Masonry boxes

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  #1  
Old 10-05-01, 04:52 PM
Able Sashweight
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Is there any special requirement for the type of boxes set in brick? Special type? Or whatever metal or plastic type that fits the location and any wet requirements?

Able
 
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  #2  
Old 10-06-01, 01:49 AM
s1nuber
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370-23(c) and (g) address this if your question is about the concrete aspect of brick. The box must be identified as suitably protected from corrosion, and identified for the application. This is another one way street; you can use a masonry box in masonry or as a typical box, but you cannot use a typical box in masonry.

370-23(b) and (c) covers the question from a dry brick aspect. The box must be supported directly or with a brace or clamp. There are no corrosion requirements for dry brick installations.

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  #3  
Old 10-06-01, 04:01 PM
Able Sashweight
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Can a box simply be mortared into place in dry brick?

Are these locations considered wet or damp or dry?
exterior wall, without overhead protection, with a lamp fixture covering the box and siliconed sealed.
exterior wall, under a covered porch, high and unlikely to ever get a sprinkle.

Able
 
  #4  
Old 10-07-01, 01:55 AM
s1nuber
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A masonry box is rated to be supported by the masonry (mortar, concrete, etc.) as well as designed for the corrosive environment. Normal boxes are not designed for this purpose. It is OK to have these boxes supported by the masonry as the wall is built (mortared in place). You cannot install a regular 2x4 handy box in this installation for example.

The determination of if the box is a wet location or not is the same as any other location. Just because the box is in masonry, does not have any affect on whether it is a wet location or not.

Any outside wall is a wet location. When you install the fixture, and silicon it, you will have met the requirements to protect the box (as long as your fixture is rated for wet locations). You do not need a wet location box if the fixture is "installed so that water cannot enter or accumulate in wiring compartments...". This is from 410-4(a) in the 99 NEC.

Under a porch is a damp location. This location does not need to be siliconed or otherwise protected from moisture entrance. The fixture must be "suitable for damp locations" or "suitable for wet locations" to protect the box.

Enjoy your day!
 
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