Supporting Stub-ups in concrete slab

[Robd58]

I was wondering what the different methods of supporting conduit Stub-ups emerging from a concrete slab are around the country. In my experience (which is primarily high rise deck work) we use Candy's FBS-12, or FBS-16 to tie our conduit to. Is this similar to how it's done elsewhere? Thanks!

 

[Cow]

This is how we do it:

 

[Robd58]

Very cool, thank you for the pics. I guess more specifically I was looking for info regarding deck slabs not slabs on grade, or below grade. But thank you for the quick reply.

 

[FionaZuppa]

This is how we do it:

wow, looks like crack city for that slab ??

 

[harborrick]

wow, looks like crack city for that slab ??

Looks like a Walgreen's project. Nice work ,we have done quite a few of them.

 

[iwire]

wow, looks like crack city for that slab ??

Very common method for smaller conduits and no the slabs do not crack.

 

[iwire]

Looks like a Walgreen's project. Nice work ,we have done quite a few of them.

Oh no, you are probably right. I was on a couple of those jobs for a short time.

To many trades at the same time.

 

[electrofelon]

Are those metallic 90's on those smaller pipes? Is that going to be code compliant?

 

[gadfly56]

This is how we do it:

I realize that in this trade you don't necessarily get extra points for neatness, but WOW! I see conduit stacked 3 high in some spots. Is there going to be enough cover after the pour?

 

[cadpoint]

Ground to 1st floor to be in concrete, RMC 90's to vertical runs;

I had to use come-a-longs to hold vertical stack for pour.

If you look at door opening it looks like it'll be a 8" pour.

 

[gadfly56]

Ground to 1st floor to be in concrete, RMC 90's to vertical runs;

I had to use come-a-longs to hold vertical stack for pour.

If you look at door opening it looks like it'll be a 8" pour.

I'm not sure you have 8" based on that door frame, but say you did. Most of that looks like not less than 3/4" EMT. At 0.842" ID and 0.049" wall, you're looking at 0.922" OD. Some spots have four (4) conduits crossing over. And the slab doesn't look like it's getting any reinforcement. So now you have 2 - 4" of cover in an un-reinforced slab. What could possibly go wrong? hmy:

 

[Dennis Alwon]

No one has answered this question. The op is looking for how to support conduit runs when you are in the middle of a floor and the slab is on a second floor. I am not sure if there is something sold for this specific situation

 

[gadfly56]

I was wondering what the different methods of supporting conduit Stub-ups emerging from a concrete slab are around the country. In my experience (which is primarily high rise deck work) we use Candy's FBS-12, or FBS-16 to tie our conduit to. Is this similar to how it's done elsewhere? Thanks!

I don't have any experience in this kind of construction so I went to Caddy's web site to take a look. How do you keep this stuff from getting ripped up after the pour is done? Somebody coming along with a job box could do some real damage.

 

[Cow]

Looks like a Walgreen's project. Nice work ,we have done quite a few of them.

This is the milking parlor equipment room for a 9000 cow dairy.

Are those metallic 90's on those smaller pipes? Is that going to be code compliant?

Sure, why not?

wow, looks like crack city for that slab ??

I'm not sure you have 8" based on that door frame, but say you did. Most of that looks like not less than 3/4" EMT. At 0.842" ID and 0.049" wall, you're looking at 0.922" OD. Some spots have four (4) conduits crossing over. And the slab doesn't look like it's getting any reinforcement. So now you have 2 - 4" of cover in an un-reinforced slab. What could possibly go wrong? hmy:

I realize that in this trade you don't necessarily get extra points for neatness, but WOW! I see conduit stacked 3 high in some spots. Is there going to be enough cover after the pour?

Are you guys aware of flowable fill(CDF)?

This should clear up any assumptions about cracking. You can see where slab height will be through the door opening. There is a 6" slab going on top of the fill.

 

[texie]

Are those metallic 90's on those smaller pipes? Is that going to be code compliant?

I'm wondering also if this can comply with 250.86. Also, the OP mentioned livestock so this may have 5547.10 issues too.

 

[FionaZuppa]

doesnt metal conduit need to be grounded? kinda a pita if you use metal between lenghts of PVC, no?

i understand the OP's Q, which i myself do not have answer for, but i would immediately be concerned about this conduit layout in a concrete slab, especially the one shown in the pics. i suspect a few saw cuts for relief after crete dries enough (can that even be done with conduit ~1/4 below the surface?), but wow, looks like problems to come later. i also assume that ground was properly compacted prior to conduit, which to me does not look like it as the ground would be very flat from all edges to center.

at best, questionable practices there??

 

[Smart $]

This is the milking parlor equipment room for a 9000 cow dairy.
Sure, why not?
Are you guys aware of flowable fill(CDF)?
This should clear up any assumptions about cracking. You can see where slab height will be through the door opening. There is a 6" slab going on top of the fill.

I knew what was going on there when you posted the first pictures. Not so much in particular that CDF was going to be used, but I've been involved with projects that used CDF. Other scenarios use so-called premium backfill... usually a mix of sand and pea gravel.

 

[Cow]

doesnt metal conduit need to be grounded? kinda a pita if you use metal between lenghts of PVC, no?

i understand the OP's Q, which i myself do not have answer for, but i would immediately be concerned about this conduit layout in a concrete slab, especially the one shown in the pics. i suspect a few saw cuts for relief after crete dries enough (can that even be done with conduit ~1/4 below the surface?), but wow, looks like problems to come later. i also assume that ground was properly compacted prior to conduit, which to me does not look like it as the ground would be very flat from all edges to center.

at best, questionable practices there??

To answer your questions, no, not all metal conduit needs to be bonded to an equipment grounding conductor. It is VERY common practice to bury steel 90's in pvc runs. I don't take any chances with burning through 90's when it's under concrete.

Secondly, the dirt was compacted. When you run 50+ conduits in a small area like that, it's going to look a little chewed up on top from all the foot traffic, etc. There is no getting around that.

I knew what was going on there when you posted the first pictures. Not so much in particular that CDF was going to be used, but I've been involved with projects that used CDF. Other scenarios use so-called premium backfill... usually a mix of sand and pea gravel.

Thanks, I'm glad a few on here get it.