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#13719 - 09/10/02 03:56 AM 1 1/2" or 2" PVC LB
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
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?
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#13720 - 09/10/02 04:05 AM Re: 1 1/2" or 2" PVC LB
sparky66wv Offline
Member
Registered: 11/17/00
Posts: 2232
Loc: West Virginia
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.
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#13721 - 09/10/02 04:10 AM Re: 1 1/2" or 2" PVC LB
tsolanto Offline
Member
Registered: 09/03/02
Posts: 131
Loc: Long Island NY
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.
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#13722 - 09/10/02 05:19 AM Re: 1 1/2" or 2" PVC LB
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Duuuh!
A reducer! I can't believe I didn't think about it.

Thanks, guys
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#13723 - 09/10/02 07:46 AM Re: 1 1/2" or 2" PVC LB
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
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
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#13724 - 09/10/02 08:53 AM Re: 1 1/2" or 2" PVC LB
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
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).]
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#13725 - 09/11/02 04:53 AM Re: 1 1/2" or 2" PVC LB
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Job done.
2" -- fairly easy.
1 1/2" would have been a mistake.
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#13726 - 09/11/02 02:40 PM Re: 1 1/2" or 2" PVC LB
tsolanto Offline
Member
Registered: 09/03/02
Posts: 131
Loc: Long Island NY
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.
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#13727 - 09/11/02 05:43 PM Re: 1 1/2" or 2" PVC LB
harold endean Offline
Member
Registered: 02/16/02
Posts: 2233
Loc: Boonton, NJ
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.
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#13728 - 09/12/02 10:31 AM Re: 1 1/2" or 2" PVC LB
WARREN1 Offline
Member
Registered: 05/09/01
Posts: 176
Loc: Greenville, SC, USA
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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