Conduit into new garage

[BLUBAYOU]

We'll be pouring concrete next week for our new detached garage I want to run (2) 2" lines of conduit from the house, 4' deep, with a 90 deg. bend turning it straight up through the concrete, so I can avoid having exposed conduit on the outside of the building, and terminate the run right at the bottom of the garage panel.

The distance between the house and garage is 32', and there will be a 4' rise to come up through the concrete.

My question is, do I need an expansion or slip joint anywhere, since one end of the conduit will be coming from the house foundation to a "floating" garage? If so, where would you put this joint? I expect to put a sleeve around the conduit where it actually passes through the concrete.

I was thinking of running the conduit fixed from the house to the 90 bend (all buried 4' deep - below frost-line), and adding a joint in the rise up through the concrete, to allow for any freeze/thaw in the ground. Is this necessary/recommended? The garage will not always be heated as of now.

Thanks in advance for any advice!

I am open to suggestions.

 

[MisterCMK]

I wouldn't do a 90 in there. That will be a pain in the keister for pulling wire though. Instead, if you have the room, use 2 45s as it will be more gradual and a lot easier for pulling wire.

 

[Mussel Kar]

My electrician used sweeping bends on the 2" PVC that goes from house to garage. Over 120 feet without any expansion joints.

 

[sberry]

Yes, you don't need to over think this. Its already buried 2 ft deeper than code, 24 inches for electric.

 

[BLUBAYOU]

thought I might be.

Should I even bother putting a sleeve where it passes through the concrete, or is that unnecessary?

 

[MXtras]

It's really not necessary to sleeve it.

Use sweeps for the 90s and you will be fine. I am sure you were planning this anyway.

I suggest adding an extra 1" conduit for phone, internet, etc.

Scott

 

[sberry]

I think thats what the extra pipe is for. I usually use a little piece of foam, that sill plate stuff is good where it comes up, lots of it is direct poured though. A little foam makes it easy to bend the pipe a little if needed. Run it right up the center of a stud bay.

 

[KenS]

Conduit is so cheap to install at this stage that I would also recommend a third run of either one- or two-inch. When your wife wants a remote switch to turn the garage lights on and off, you'll be glad you have it.

 

[dipper]

definitely add a third conduit, maybe 1-1/2" along with the 2". Only need to be 18-24" below grade, 48" is extreme and not needed for electric/gas. Water is a different story.
Don't worry about sleeving. I just put a couple of holes in the foundation block and ran it right up the inside of the block. Sweep 90's are what you want to use.
I pulled 4 #4awg thru 1.5" conduit, a little tight; but with some lube it wasn't too bad.
2" will be plenty big enough.

 

[dipper]

here's a couple more pics.
make sure you glue it real good too! don't use cheap glue and don't forget the primer!!!!
I made those sweeps in the first pic with a pvc hotbox. If you gotta make bends, slow sweeping are the best.
The last one is where they go into the basement of the house.

 

[W-Cummins]

I was required to use the slip joints on my installation. If I had wanted to use sec 80 instead of sec 40 (that I needed to use due to fill restrictions) I would have not needed the slip joints. The concrete crew wrapped the conduits where they passed through the floor with thin foam (like still seal) Keeps the concrete from sticking to the conduit and allow some movement)

William....

 

[BLUBAYOU]

The second 2" is a spare at this point, but I think I will run a third that is 1". Now's the time! I know I'll never regret it. I guess I am so used to putting everything down 4+ feet for water, I didn't really consider the fact that it is just electric.

I have a few odd lengths of that sill sealer, so I'll use that to wrap them up through the concrete. I hadn't thought about the little bit of added flexibility that might give in lining them up above, nice benefit of doing it. I plan to run them right up inside a stud cavity, so I can flush mount the panel. It will be near the entrance to the garage, so I don't want to have it surface mounted.

The excavator left his machines here for the weekend, with the keys in them might make things go a little quicker. I know him well, so I called to see if he is cool with me running one for the trench. I am sure he won't care, but I just want his permission first. If I get the OK, I have a few other little things around the house I can do at the same time.

No big deal if not. A 2' trench is a lot less of a headache to hand dig 32' than a 4' one would be.

Thanks for the input guys. I appreciate it!

 

[BLUBAYOU]

if required to do so, where should I put a slip joint?

 

[dipper]

running that size of conduit thru a 2x4 wall you will probably have to have a small "chase"
and bend it into the wall cavity. That's kind of what I had to do with mine, but who knows. I think going from the 8" block to the 6"block it couldnt come straight up thru the center of the wall cavity.

 

[BLUBAYOU]

I should be okay, as my walls will be 2x6's. I had a bunch leftover from a previous build, so I decided to use it up on the garage.