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Old 10-12-2017, 02:17 PM   #1
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Default Installation for masonry driveway piers.

I am installing sconce lights and receptacle outlets on a pair of 6' tall driveway piers.
They are constructed of masonry block and will be finished with 1" stone veneer.
The pier blocking will be finished, but the stone will not be installed.
I am going to use either liquid tight conduit or just UF cable to each box fished in from an opening at the base of the pier.

I'm going to use an Arlington InBox for the receptacle, but what are the best boxes to use for a side mount sconce light in block?

I know I could use a 1gang mason box w/ 6/32, but I don't know the weight of the light.
Are round mason boxes readily available or do they make a pancake box that is rated for use in mortar? Then I just mount the pancake to the surface.

Also what are good ways to secure the box in the block once I cut the block out? Just use mortar or are there easier adhesives to use for boxes in block?
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Old 10-12-2017, 03:27 PM   #2
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Outdoor fixtures and pancake boxes don't work well together.
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Old 10-12-2017, 09:07 PM   #3
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I don't like UF, you can't replace it when it goes bad. And it always goes bad, it's just a matter of when.

I would stub 3/4 pvc into the block and use either a SG deep masonry box or a 4 sq deep with a mud ring. The last CMU block building I did was a gym and 4 sq deeps with 1.5" mud rings worked perfectly. Get your grounding pigtail installed first off, then wrap everything with duct tape to keep the concrete slurry from getting in. Tie wire through the 6-32 device holes to a scrap piece of conduit to hold the box flush to the outside. Works well.

Depending on block thickness, you can add extensions to the mud rings if you need more depth.
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Old 10-12-2017, 10:50 PM   #4
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I always preferred masonry boxes begause the extra depth square edges held them in place well.

I hate UF for underground or in solid gouted situations but inside an open pier would be fine.


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Outdoor fixtures and pancake boxes don't work well together.
Dpends on the canopy and mounting bracket style. A pancake could actually make it very simple.
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Old 10-13-2017, 04:15 AM   #5
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In block or brick?
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Old 10-13-2017, 12:17 PM   #6
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Quote:
Originally Posted by Cow View Post
I don't like UF, you can't replace it when it goes bad. And it always goes bad, it's just a matter of when.

I would stub 3/4 pvc into the block and use either a SG deep masonry box or a 4 sq deep with a mud ring. The last CMU block building I did was a gym and 4 sq deeps with 1.5" mud rings worked perfectly. Get your grounding pigtail installed first off, then wrap everything with duct tape to keep the concrete slurry from getting in. Tie wire through the 6-32 device holes to a scrap piece of conduit to hold the box flush to the outside. Works well.

Depending on block thickness, you can add extensions to the mud rings if you need more depth.
This ^^^^^^^^^^
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Old 10-16-2017, 06:06 PM   #7
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I never run UF out to something, I only use it once I'm there if needed. I always run PVC to everything outdoors.
I'm running PVC 250' to these driveway piers. They are constructed of concrete block.

I am putting a 6x6x4 pvc box at the base of the pier and coming out twice with liquid tight to the light and a GFCI outlet box. Then out of the PVC box again to the other pier on the other side of the driveway.

I was only thinking of maybe coming out of the 6x6 pvc box with UF instead of liquid tight if it was too much of a pain getting liquid tight into the pier.
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Old 10-16-2017, 07:43 PM   #8
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I just found this by Arlington. It looks like one of the only mounting blocks they make that will accommodate stone or brick.
If I can find this product then I can cut a hole in the block, mount it, adjust the depth to the stone and the masons can install stone behind the plate. Customer can have the plate painted to match the stone.

http://www.aimedia.co/media/spec-sheets/8141ALP.pdf
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Old 10-17-2017, 09:22 AM   #9
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That's bad @ss.

Arlington makes some good stuff!!
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Old 10-18-2017, 11:26 AM   #10
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Actually I called Arlington and this is an old product, but they still have some left.
I'm trying to figure out whether to use this or have the masons install a matching colored cement mounting block if they can find one.
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