90 degree turn off LB

[justinae]

I've got an LB fitting going into my garage which is 2x4 walls. How do i make an immediate 90 degree turn inside the wall to the panel above? I was thinking flex PVC. It will have 3 #2 and 1 #4 individual conductors. Can I get away with 1" flex? If not what other methods are there?

Thanks!
Justin

 

[ddawg16]

Another LB? Just use a short ****** between them if you use metal. PVC is just as easy.

Makes pulling the wire easy....you pull the covers off both LB's and you have a hole straight through.

 

[justinae]

I thought of that too but wasn't sure if it was allowed. It's getting inspected.

 

[walrus]

Will the LBs be accessible?, can't bury one in the wall

 

[justinae]

Not sure yet. I'm considering putting rock up on the walls.

 

['04 Cummins]

Can you just run the outside PVC up higher and then LB straight into the back of the panel, or are you beyond that possibility in your installation?

 

[justinae]

I suppose i could run it up the three feet or so but it wouldn't be my preference visually. I'm surprised this isn't a standard issue.

thanks for all the replies so far.

 

[walrus]

Not sure yet. I'm considering putting rock up on the walls.

Then you can't do it unless you make a trap door or something to make it accessible

 

[Stuart in MN]

I assume the panel will be flush mounted? You could run the LB with a short ****** into a small junction box that is also flush mounted, then run a conduit from it straight up to the panel. That way if you do finish the walls the junction box will still be accessible. You can paint the cover to match the wall to make it less obvious.

 

[Zeke]

You will have to mind the bend radius of the conductors. Stuart has the best answer for my money, but it needs to be a deep box or one with an extension ring and then a mud ring flush with your intended finish wall. If you don't get to the drywall stage, you should be able to cover the box with a blank cover. A 2nd LB is pretty much out of the question the way I see it.

I would try to connect the in-the-wall box with a flush bushing to the LB.

What size conduit?

 

[justinae]

Conduit is 1 1/4". Yeah I like the junction box idea as well. It provides more room then and LB, although it will effectively be doing the same thing. I don't mind if the cover sticks out past the drywall a bit.

Where could I find out the radius limits for individual conductors?

 

[justinae]

What about just using 1 1/4" flex straight off the back of the LB?
http://www.platt.com/platt-electric...allic/Carlon/15009100/product.aspx?zpid=14675

 

[Stuart in MN]

I looked at the Southwire website - all I could find was they said the minimum bend radius is one that will not damage the wire, which doesn't help much.

 

[pattenp]

I don't think the 1 1/4" liquid tight has a tight enough bending radius to stay withing the 2x4 wall depth.

Edit: The bend radius on 1 1/4" liquid tight is over 5 inches.

 

[justinae]

I saw some info about 6 or 8 times the diameter. Still looking for it.

 

[pattenp]

non-shielded conductors are not to be bent to a radius of less than 8 times their diameter.
2011 NEC 300.34

I pulled 2-2-2-4 MHF through two 2" LB's back to back. I can't imagine doing the same with 1 1/4" LB's. It was a tight enough bend in the 2".

 

[justinae]

Thanks Pattenp!