Alot of us have used LB;s as a great way to transition a conduit run or even as a pull point.However I have found that using LB;s with feeder or service size conductors are not compliant,I think mostly for the cu.inch and bending radius.I have never really second guessed this fitting,figuring as long as I ordered the cooresponing size, than it should handle the conductors that are going in the conduit that has been sized accordingly.Lately we have been using a wireway/trough with a much better feel for the end result, along with an easier install.I just went over this with our estimation dept.so I hope I/am correct in my findings....
LB;s
- Thread starter jflynn
- Start date
- Status
quogueelectric
Senior Member
- Location
- new york
Yes sometimes we use an oversized lb with reducers to compensate when an lb is desired be careful as to trough size and you can orient your covers to help with pulling clearances.
- Location
- Illinois
- Occupation
- retired electrician
LBs for conductors sized #4 and larger must 314.28(A)(2) or (3). Most standard size fittings do not comply. You cannot not just use a standard size conduit body of the same trade size as the conduit.
I found that "pulling elbows" such as the one listed here:
http://www.crouse-hinds.com/catalog/PDFS/00012to00013.pdf
are fabulous for such projects, however, your estimating department might have a heart attack.
My opinion, use one, and you will be sold.
http://www.crouse-hinds.com/catalog/PDFS/00012to00013.pdf
are fabulous for such projects, however, your estimating department might have a heart attack.
My opinion, use one, and you will be sold.
If the LB does not comply with 314.28, the manufacturer must label the fitting with the maximum size and number of conductors that the fitting is capable of accomodating.
It's an old Chicago myth that service conductors require a fitting larger than what would be required for other conductors
It's an old Chicago myth that service conductors require a fitting larger than what would be required for other conductors
- Location
- Illinois
- Occupation
- retired electrician
Brian,
There is not a requirement for the manufacture to mark the fitting with the maximum size and number of conductors, however if he doesn't and you are installing conductors #4 and larger, then size of the fitting must comply with 314.28(A)(2) if it is an LB and 314.28(A)(1) if it is a C.
There is not a requirement for the manufacture to mark the fitting with the maximum size and number of conductors, however if he doesn't and you are installing conductors #4 and larger, then size of the fitting must comply with 314.28(A)(2) if it is an LB and 314.28(A)(1) if it is a C.
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