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I'm adding a circuit, but I need to make a splice. Can I splice in an LB conduit body? Will I still be compliant with the NEC?

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Image: https://iaeimagazine.org/features/conduit-bodies-and-their-use-in-accordance-with-the-nec/

FreeMan
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Phedley
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  • Does the LB have its inside volume (in cubic inches) marked somewhere on it? – ThreePhaseEel Apr 10 '18 at 23:06
  • Hello, and welcome to Stack Exchange. What's an "LB"? (@ThreePhaseEel seems to know, but others wouldn't.) – Daniel Griscom Apr 11 '18 at 00:01
  • @DanielGriscom -- a "LB" is a style of conduit body that elbows out the back, such as [one of these](https://www.garvinindustries.com/fittings/aluminum-and-malleable-iron-conduit-bodies/aluminum-lb/lb100) – ThreePhaseEel Apr 11 '18 at 00:15
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    The point of this site is not only to answer a specific person's question, but to build up a body of information that others can consult. Unreferenced acronyms and obscure terminology harm that goal. – Daniel Griscom Apr 11 '18 at 11:43
  • Added image of "LB" and other "L" conduits, since this question seems revived and the above link in the comment is no longer available. – P2000 Nov 29 '21 at 14:58
  • Maybe specify an LB is a type of Conduit Body or "Pull Hub" (not intended for splicing) – mark f Nov 29 '21 at 19:21
  • Yes, you can. However the LB needs to have its volume clearly marked and you have to do fill calcs to determine the legality. – Sparky22 Feb 24 '23 at 17:46

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Absolutely not. No splicing in a conduit body. They are only to help fish wires.

Now -- there is an utterly useless exception. If the conduit body is stamped with a number of cubic inches, then you can apply the junction box fill rules instead. In any size of conduit that's reasonable for your wires, there aren't nearly enough cubic inches in the conduit bodies!

You are better off just swapping the conduit body for a junction box. Play with several sizes of box to see which one will line up without having to cut conduit. Been there done that.

Harper - Reinstate Monica
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