Wire size allowed in lb's

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SmithBuilt

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Foothills of NC
Does anyone know of a reference stating the wire sizes allowed for LB's and LR, LL?

I know it's printed inside of some. I would like to have a list of them handy while doing an estimate.
 
Manufacturers have developed listings of there specific items. These listings are by internal volume of the fittings themselves, wire size and the max # of wires by size and volume. I used to have a complete list of these but since retirement it went by the way with other things,

I would suggest you contact your local sales reps for ,Crouse-Hinds,Appleton,Killark and OZ- Gedney.They will supply you at a minimum the volume of each fitting and may evem have the actual fill by wire size.

dick
 
Tim,
For conductors #4 and larger, I don't think that the volume enters into this. The fitting must be marked for the maximum number and size of conductors that are permitted or the fitting has to comply with the rule in 314.28(A)(2).
 
Don't forget that volume is not all that metters; you also have to be able to install the conductors without damaging them.
 
Never saw one of those before on my side of the fence in classified areas............

does the fitting manufacturer list a minimum bend radius that the fitting will accomodate?

dick
 
That fitting would still have to have the maximum number and size of conductors marked on it and the use of it appears to be a violation of 300.18(A).
 
LarryFine said:
Don't forget that volume is not all that metters; you also have to be able to install the conductors without damaging them.
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Good point Larry,
Also O.P. if you plan on using an LB for feeders you may want to rethink it,I/d suggest a wireway to act as an LB....
 
don_resqcapt19 said:
That fitting would still have to have the maximum number and size of conductors marked on it and the use of it appears to be a violation of 300.18(A).
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Interesting point. If they are UL listed, which they are, would that make any difference?
 
SmithBuilt said:
I like it but would like to know opinions on Dennis's question.
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Personally I think they are fine--not larry fine- just fine. :) I believe they fulfill the intent of art. 300.18.

I thought I posted this before but I guess I never hit the submit button.
 
I agree they fulfill the intent of art. 300.18.


If they are as fine as Larry they'll work great. Maybe have to censor the LB though? :grin:

I miss the old Larry though.
 
Dennis Alwon said:
Personally I think they are fine--not larry fine- just fine. :) I believe they fulfill the intent of art. 300.18.
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Oh, a wise guy!

300.18 Raceway Installations.
(A) Complete Runs. Raceways, other than busways or exposed raceways having hinged or removable covers, shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors.
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I agree. I'd say they qualify as "exposed raceways having . . . removable covers".
 
LarryFine said:
Oh, a wise guy!

I agree. I'd say they qualify as "exposed raceways having . . . removable covers".
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Larry,
If only half of the LB was removed to install the wire, it would be ok, but they show the wire being installed without the conduit not connected to the LB and that is a violation of 300.18(A). The fact that this is a listed product does not change the fact that the use of this product as shown on the website is a code violation.
 
don_resqcapt19 said:
Tim,
For conductors #4 and larger, I don't think that the volume enters into this. The fitting must be marked for the maximum number and size of conductors that are permitted or the fitting has to comply with the rule in 314.28(A)(2).
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So why aren't 2" LB's 30 inches long?

314.28 Pull and Junction Boxes and Conduit Bodies.

(A)(2) Angle or U Pulls, or Splices. Where splices or where angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than six times the metric designator (trade size) of the largest raceway in a row. This distance shall be increased for additional entries by the amount of the sum of the diameters of all other raceway entries in the same row on the same wall of the box. Each row shall be calculated individually, and the single row that provides the maximum distance shall be used.
Exception: Where a raceway or cable entry is in the wall of a box or conduit body opposite a removable cover, the distance from that wall to the cover shall be permitted to comply with the distance required for one wire per terminal in Table 312.6(A).
The distance between raceway entries enclosing the same conductor shall not be less than six times the metric designator (trade size) of the larger raceway.
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I still believe the intent of art.300.18(A) is so that one is able to pull out wires and install new ones without having to take the raceways apart. This not only complies with that purpose but makes the install easier. Why would anyone turn it down esp. if the fitting is listed.

I do understand that the listed fitting does not necessarily mean it will be a code compliant install.
 
don_resqcapt19 said:
If only half of the LB was removed to install the wire, it would be ok, but they show the wire being installed without the conduit not connected to the LB
Click to expand...

If you look close part of the LB is on the conduit, it may have rounded edges to comply.
 
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