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#13719 09/10/02 05:56 AM
Joined: Mar 2001
Posts: 2,056
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Redsy Offline OP
Member
I have to "sleeve" 100 amp al. SER (3 #2, 1 #4) for physical protection. (TODAY!) I will need to run it through a PVC LB.
I would like to keep the piping as small as possible, but I'm afraid a 1 1/2" LB will be too tight.
Any (quick) help out there?

#13720 09/10/02 06:05 AM
Joined: Nov 2000
Posts: 2,236
Member
If 2" isn't too big for any reason other than asthetics, I've often found that 2" is cheaper than 1-1/2", simply because they sell so much more of it.

Getting SER through an LB a few too many times has convinced me that it's cheaper to pipe all the way and use PVC and RHW-2, plus the installation lasts much longer.


-Virgil
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#13721 09/10/02 06:10 AM
Joined: Sep 2002
Posts: 131
T
Member
You can use a 2" LB with 1 1/2 PVC just buy a reducer. The amount of time and effort you will save over struggling to get the SER into the 1 1/2 LB will be worth it.

#13722 09/10/02 07:19 AM
Joined: Mar 2001
Posts: 2,056
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Redsy Offline OP
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Duuuh!
A reducer! I can't believe I didn't think about it.

Thanks, guys

#13723 09/10/02 09:46 AM
Joined: Nov 2000
Posts: 2,148
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Member
I know its common practice to use larger LB with reducers and have done that many times myself, but how are you going to support the LB? The conduit is only permitted to support conduit bodies of the same trade size as the conduit. See 352.10(H) for rigid nonmetallic conduit and Exception #1 to 314.23(E) for rigid, IMC and EMT.
Don


Don(resqcapt19)
#13724 09/10/02 10:53 AM
Joined: Mar 2001
Posts: 2,056
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Redsy Offline OP
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What I'm doing is running an SER feeder through the basement and crawl space of a 1st floor unit, out the wall and up into the second floor to feed the panel.
I am using the PVC (about 12' with an LB at each wall penetration) for some physical protection.

Ah well, 2" it is.

[This message has been edited by Redsy (edited 09-10-2002).]

#13725 09/11/02 06:53 AM
Joined: Mar 2001
Posts: 2,056
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Redsy Offline OP
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Job done.
2" -- fairly easy.
1 1/2" would have been a mistake.

#13726 09/11/02 04:40 PM
Joined: Sep 2002
Posts: 131
T
Member
I usually run a screw through the back of the LB into the wood sheething of the house. Not sure if its legal but it works well especially when I am trying to get the SER or SEU into the house. It adds a lot of stability to the LB.

#13727 09/11/02 07:43 PM
Joined: Feb 2002
Posts: 2,233
H
Member
tsolanto,

Using a screw in the back of the LB. I was doing that for many years. It works well, and I am not sure if it is against the code. I wouldn't fail that job if I was inspecting. After all the pipe is there just to protect the wire from damage.

#13728 09/12/02 12:31 PM
Joined: May 2001
Posts: 176
W
Member
Art. 370-23 of the 1999 Code does not address the use of screws. Art. 370-23(b)(1) addresses the use of nails, and "they shall pass through the interior within 1/4 inch of the back or the ends of the enclosure." However, I would prefer screws as they would not pull out as easily as nails. IF one considers the LB as an enclosure, then par. (e) would not allow screws or nails, but requires support within 3 feet of the enclosure. I must assume the Code means a strap support, and that would be my preference. In any case, the local AHJ has the final say.

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