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Thread: Porch ceiling lighting

  1. #1
    DIY Junior Member
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    Default Porch ceiling lighting

    I have a question about proper electrical box for damp location. If a light is mounted on 'inside' ceiling of a covered porch, and the wire going to the light is in proper conduit and rated for damp/wet locations (THWN).

    Is a weatherproof box required if you were to mount a light to one of the rafters of a porch like this?

    Example picture:



    Can either a steel or weatherproof box be used?



    or


  2. #2
    Plumber jimbo's Avatar
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    I would use a weatherproof box. One of our electrical gurus will tell us if that is a code requirement, but it only makes sense to do it that way, regardless.

  3. #3
    Jack of all trades frenchie's Avatar
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    It's outdoors, so yes.

    Edit: I was wrong.


    I'm no code guru, but I do have a copy of the 2005 NEC... it defines damp location as:

    Location,Damp. Locations protected from weather and not subject tosaturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations (...)
    Elsewhere, it says:

    Damp or Wet Locations. In damp or wet locations, boxes, conduit bodies, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting. Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations.
    So, it sounds like you can use any old box, in a damp (but not wet) location, as long as you place or equip it so that moisture can't enter or accumulate in the box.


    ...But as a practical matter, I don't see how you could do that, without using a weatherproof box. Maybe on one of those porches that has a ceilinad and a roof, so there's a dry enclosed "attic" of sorts... but I'm not seeing that, in the picture you posted.
    Last edited by frenchie; 12-06-2009 at 04:29 PM.
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  4. #4
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    Where does the NEC require weather proof boxes in damp locations? I know they do for wet.


    Location, Damp. Locations protected from weather and
    not subject to saturation with water or other liquids but
    subject to moderate degrees of moisture. Examples of such
    locations include partially protected locations under canopies,
    marquees, roofed open porches, and like locations,
    and interior locations subject to moderate degrees of moisture,
    such as some basements, some barns, and some coldstorage
    warehouses.

    Location, Dry. A location not normally subject to dampness
    or wetness. A location classified as dry may be temporarily
    subject to dampness or wetness, as in the case of a
    building under construction.

    Location, Wet. Installations underground or in concrete
    slabs or masonry in direct contact with the earth; in locations
    subject to saturation with water or other liquids, such
    as vehicle washing areas; and in unprotected locations exposed
    to weather.

  5. #5
    Jack of all trades frenchie's Avatar
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    It doesn't - see my edit to the above post
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    there is nothing better than the
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    while banging away on brass with a chisel and hammer...

    it smells like......victory......

    do not hit your thumb...
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  6. #6
    DIY Senior Member burleymike's Avatar
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    I seen both types of boxes used. Though the best thing to do is call your inspector and see what he wants. Are the fixtures you are going to use rated for damp locations?

  7. #7
    DIY Member ChuckS's Avatar
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    The water proof boxes are just a couple of bucks more.

  8. #8
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    Does NEC require a certain type of box round vs rectangle for mounting a light fixture?

    Would this style box be sufficient? It would mount much cleaner to the side of a rafter then a round box.


  9. #9

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    Many light fixtures need a round box. For others the above will work. Depends on what fixture you want to install...

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