Conduit question... How should this be done?

[mike93lx]

I'm helping a buddy get power to his barn. We just ran 2" conduit at 3.5 to 4' deep and will be using 2-2-2-4 MHF. At the house end, the run goes to a 90 sweep and a stub that is about 1' above grade. Problem is that there is a concrete slab protruding from the house by about 1' that he doesn't want to remove. The conduit is right against it.

I was thinking an LB at the slab (horizontally) to a 90 sweep, up the wall, to another LB for entering the house.

My original plan was to come up tight to the foundation with an expansion joint and an LB into the house.

Sorry, no pic right now, will upload one if he sends it to me.

How's my plan? Any concerns with no expansion joint? I was hoping the depth of the run might make it unnecessary. I could still install one below the last LB, if needed.

How would you do this?

 

[LXCam]

There's nothing wrong with that plan nor do you need to compensate for expansion with that assembly.

 

[mike93lx]

There's nothing wrong with that plan nor do you need to compensate for expansion with that assembly.

Thanks. Is it the depth of the run that addresses expansion, or something else? The entire run is below the real frost line that we experience.

 

[teamextreme]

My only concern would be the conduit and an LB sitting at grade on the slab, which is just begging for it to be stepped on, kicked and generally abused. I would be hesitant to use PVC, for sure. I would consider a short piece of rigid and metal LB. Or, how thick is the slab? Is it possible to excavate under and core through it at the wall?

 

[mike93lx]

My only concern would be the conduit and an LB sitting at grade on the slab, which is just begging for it to be stepped on, kicked and generally abused. I would be hesitant to use PVC, for sure. I would consider a short piece of rigid and metal LB. Or, how thick is the slab? Is it possible to excavate under and core through it at the wall?

It's location should not put it at much risk of damage,but a fair concern. I'll look at a metal LB and elbow. How do i transition from PVC to metal? A threaded coupling on the PVC?

Coring isn't going to happen. Lots of other projects to deal with, most importantly a barn rebuild.

 

[teamextreme]

Use a male adapter to thread into the metal LB. Or if it's not likely to be damaged, maybe just sch 80 PVC would suffice.

 

[Bert_]

It's location should not put it at much risk of damage,but a fair concern. I'll look at a metal LB and elbow. How do i transition from PVC to metal? A threaded coupling on the PVC?

Coring isn't going to happen. Lots of other projects to deal with, most importantly a barn rebuild.

Use a ****** from LB then go to a PVC FA (female adapter). Lots better then using a TA since the transition can be underground and the TA's like to break at the threads. I do that a lot, I'll grab a pic tomorrow if it's dry enough to dig.

 

[Bert_]

Here's what I do. You can use premade ******* for the threaded pipe.

 

[mike93lx]

Here's what I do. You can use premade ******* for the threaded pipe.

thanks Bert, that's really helpful

 

[Marctrees]

Here's what I do. You can use premade ******* for the threaded pipe.

Bert - I've never had need to do that..

But you must have the steel bonded to ground somewhere?

In the OP's situation, if he were to use conductive raceway section, , logically it should be grounded.

Isn't that a Code requirement .... w only a very short protection sleeve possible exemption ?

Must be.

Marc

 

[rockwithjason]

the only other approach I can think of is to core drill a hole thru the slab at the wall and then dig under the slab and stub up. there is nothing wrong with your original plan

 

[Bert_]

Bert - I've never had need to do that..

But you must have the steel bonded to ground somewhere?

In the OP's situation, if he were to use conductive raceway section, , logically it should be grounded.

Isn't that a Code requirement .... w only a very short protection sleeve possible exemption ?

Must be.

Marc

This is steel from a foot or so below grade all the way to the control box not shown above the photo. I used emt from the lb up in this instance.

I used to do them all in pvc too but after fixing a few that got broke I changed. Anything saved by using pvc was more than spent if it needed repair. Most of this is on grain handling equipment. Most residential stuff still gets pvc but not always.