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I have used an in wall splice with Romex 14/2 that has 3 ports (hot, neutral, ground) but i would now like to use the same method to splice a 12/3 cable. I'm unable to find a splice with 4 ports. Can I just use two regular 3 port splices and divide it 2-2 or 3-1?

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You can't, but no need.

If you're referring to the Tyco Electronics Romex splice kits, yes, they make those for 3-wire w/ground as well as 2-wire w/ ground.

If you mean some other splice method, you have to read its instructions for whether it is suitable in-wall. As far as I know the Tyco is the only one that is UL-listed for buried in-wall splicing.

Further, use of in-wall splice blocks is restricted. It can only be done for repair, not extension for instance; and even then, only as a last resort when nothing else is possible. If it is at all feasible for you to re-run the entire cable run, or a run to an accessible point (somewhere you want a receptacle, for instance), you must do that instead.

  • I'm using it for extension to avoid having a JB as per a suggestion in another recent question – amphibient Apr 13 '20 at 1:42
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    @amphibient I would either add that important detail to your question or ask a new question, so you can hear from some of the experts other than myself. My understanding is the product was initially given carte-blanche, but usage was limited because of problems. Best bet, find a place you want a receptacle. You can never have too many receptacles! – Harper - Reinstate Monica Apr 13 '20 at 1:44
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    @amphibient Reduce chaos by eliminating code violations :) You'll thank yourself when you put the house up for sale, because you'll have fewer eyebrow-raisers to put on the disclosure sheet! – Harper - Reinstate Monica Apr 13 '20 at 1:56
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    @amphibient Just seems silly to go 90% of the way to complying with Code and not go the last 10%. All the expense, none of the reward. But let's get a second opinion on the legality of those splices in your usage. I've been wrong before. – Harper - Reinstate Monica Apr 13 '20 at 2:22
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    @amphibient is the problem the quantity of JBs in that location, or there mere presence? It seems silly to object to JBs tucked away inside a cabinet, anyway.... – ThreePhaseEel Apr 13 '20 at 4:09
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No, all the conductors need to be part of the same assembly. A 4-hole version is NSi Model # NMS-3, they are about $15 from Home Depot.

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