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Old 10-25-2013, 09:20 AM   #1
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exterior lighting outlet: round or rectangular box?


new construction application, looking to add exterior sconce lighting on wood siding, utilizing a wood mounting block. face of box would be flush with mounting block, with exterior light mounted over it (i.e. the box would not be outside). so my question is should i use a round or rectangular box (2x4)? most of the stuff i am finding online uses round boxes but is there really an issue with using rectangular? it appears as if some light fixtures require round boxes, due to the shape/size of the portion of the fixture that would be flush with the mounting block so it would seem using a rectangular box may limit my choices of available fixtures but if the fixture entirely covers the box, what's the difference? reason i ask is i don't have a hole saw and would rather not spend $20 on one to make one hole or fool around with trying to make a round hole without one. i suppose i could use a jig saw.

what do other folks mostly see out there, round or rectangular boxes?

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Old 10-25-2013, 09:27 AM   #2
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exterior lighting outlet: round or rectangular box?


It is usually far easier to mount a fixture on a round or octagonal box.

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Old 10-25-2013, 09:30 AM   #3
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exterior lighting outlet: round or rectangular box?


In my limited experience its always been round or octagon. I hypothesize that the diagonal orientation of the screw holes provide better up down left right stability to the installed fixture. Most likely that is a load of feces but I can't turn off my mind even when it is heading over the cliff.
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Old 10-25-2013, 09:35 AM   #4
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exterior lighting outlet: round or rectangular box?


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It is usually far easier to mount a fixture on a round or octagonal box.
this was the conclusion i was coming to, based on my limited internet research. i should be able to cut a halfway decent hole using my jig saw.

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Old 10-25-2013, 09:36 AM   #5
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exterior lighting outlet: round or rectangular box?


A rectangular box can only support small fixtures. The round box gives you more options.
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Old 10-25-2013, 01:05 PM   #6
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exterior lighting outlet: round or rectangular box?


Depending on the base of the light a "pancake" box may work ....
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Old 10-25-2013, 01:22 PM   #7
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exterior lighting outlet: round or rectangular box?


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Depending on the base of the light a "pancake" box may work ....
i thought about that but since the siding isn't even up yet, simple enough to use a full size box and not have to screw around with wire fill, etc.
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Old 10-25-2013, 01:47 PM   #8
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exterior lighting outlet: round or rectangular box?


So much easier to make a round hole with a hole saw than to make a square hole.
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Old 10-25-2013, 01:49 PM   #9
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exterior lighting outlet: round or rectangular box?


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So much easier to make a round hole with a hole saw than to make a square hole.
agreed...but i don't have one of those and don't want to buy one to make one hole.
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Old 10-25-2013, 07:37 PM   #10
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exterior lighting outlet: round or rectangular box?


Every application is different... I favor no option over the other, I go with what I'm delt with.... par for the course...
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Old 10-25-2013, 08:15 PM   #11
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exterior lighting outlet: round or rectangular box?


Or use a siding mounting block instead. Then you'd just be applying the siding up to the edges of it. Can't recall the brand, but there's at least one kind that's made of the same stuff as cement shingles. Sturdi-mount? That and Arlington and Special-Lite make others.
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Old 10-26-2013, 02:15 AM   #12
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exterior lighting outlet: round or rectangular box?


Will a light fixture even fit in a rectangle box? I don't think the screws even align the same way.
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Old 10-27-2013, 08:12 AM   #13
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exterior lighting outlet: round or rectangular box?


Having just mounted a dozen different kinds of lighting both inside and out, all of them came with brackets necessary to mount on several kinds of boxes: regular outlet, 4" square and 4" round. But it'd certainly be something to check on before purchasing, or just pick up the brackets at a lighting place.
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Old 10-27-2013, 01:17 PM   #14
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exterior lighting outlet: round or rectangular box?


if you use a rectangular 'device' box, you'll be limited to a 6lb total weight for the fixture. 314.27 (a)(1).

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