Exterior flush mount boxes

[cahilj]

Has any one ever seen or used 4" round, flush mount (not surface) boxes for exterior lights on metal siding? Most of the light fixtures I'd like to use require a 4" round box, but the base of the light is square, designed to sit tight on regular vinyl/stucco/wood/etc siding.

 

[Jim greengo]

Just use a cut in box

 

[cahilj]

It needs to be wet rated. I've never seen a metal old work 4" round box, let alone a wet rated one.

 

[Bert_]

If the box is IN the wall it does not need to be "wet rated". Only the light or cover going on the outside needs to be "wet rated"

 

[Low277]

Depending on what type of exterior finish you have and the depth of the lights base it may be possible to use a round pan box. Available in both steel or plastic.

Also most pan boxes are only for one NM cable to enter as most are only 1/2" thick. So if you have 2 cables they are not big enough.

 

[B-Well]

Depending on the available space for wiring connections behind the light fixture itself you may not need a box. Instead, you can install a siding mounting block specific to your siding profile with a wood block (2x4, 2x6 etc) behind it to back it up and support the fixture.

Wood block screwed to the exterior plywood, mounting block covering it, hole through all for romex. Fixture mount bracket will then be screwed through the mounting block surface and into the wood backer and connections will be made in the space behind the light fixture.

Code only specifies connections are not to be made inside of wall cavity. This type of installation always passes electrical inspection here in VA.

 

[Bert_]

Depending on the available space for wiring connections behind the light fixture itself you may not need a box. Instead, you can install a siding mounting block specific to your siding profile with a wood block (2x4, 2x6 etc) behind it to back it up and support the fixture.

Wood block screwed to the exterior plywood, mounting block covering it, hole through all for romex. Fixture mount bracket will then be screwed through the mounting block surface and into the wood backer and connections will be made in the space behind the light fixture.

Code only specifies connections are not to be made inside of wall cavity. This type of installation always passes electrical inspection here in VA.

Any splice needs to be in a box. Several manufacturers make siding blocks that are boxes, but many generic ones are not a box.

 

[alfredeneuman]

Also most pan boxes are only for one NM cable to enter as most are only 1/2" thick. So if you have 2 cables they are not big enough.

The wirefill is modified by the volume of any raised covers or canopies.

 

[GoodStuff]

Check this Solution for mounting lights to ribbed exterior surface
https://www.garagejournal.com/forum/showthread.php?t=322917


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