How do I wire two GFCI receptacles with two separate circuit with a common neutral for dishwasher and disposal. I only have a 12/3 load wire and there is no way I can run another neutral.The kitchen is fully done. The gfci's getting powered from a two pole AFCI breaker but they sharing the neutral. I did a ton of research and have tried to connect many different ways but one of the GFCI always trips when both appliances are on. City requires both AFCi and GFCI protection. I'am using two pole AFCI breaker and a dead front GFCI receptacles just right underneath the electrical panel. Electrician said it won't work with out a second separate neutral. I have seen answers topics similar to this but I did't not find the one I am looking for. I somebody could provide a wiring diagram that would help a lot. I have learned that the GFCI's can't share the neutral on the load side, so I tried to use only the line side but then where I connect the only one load neutral? Or, What if if I swap the two pole AFCI to a two pole GFCI breaker and using two AFCI receptacles instead? It will be the same or I will be able do it? I would appreciate every help! Thank you!
The electrician is correct, it is not possible to protect a shared-neutral multi-wire branch circuit like that with two independent 120V dead-front GFCIs.
A GFCI operates by monitoring for a current imbalance between hot and neutral; if you join two "load" neutrals together then current from one GFCI's hot will be able to flow back through the other GFCI (instead back where it came from) and look like a ground fault to both GFCIs.
Find a two-pole/240V combination AFCI/GFCI breaker for your panel, to use with the existing wiring.
Replace the entire run of /3 from the panel to load loads with wiring that has two separate neutrals (two /2s, /2/2, etc).
Instead of ripping out all the wiring between the panel and the kitchen, move the GFCI dead-fronts to the kitchen. Feed each with one hot and the common neutral; run dedicated hot and neutral to the loads.
If the disposal and dishwasher plug in, you may be able to replace their receptacles with GFCI receptacles (wired to "line" only, no "load" passthrough), if local code allows GFCIs to be located wherever those receptacles are.
If you really, really can't change the wiring and can't find a combination AFCI/GFCI breaker, you could perhaps instead swap out the box where you have the GFCI dead-fronts for a teeny-tiny "spa panel" size sub-panel. Feed it from the two AFCI breakers, and install a two-pole 20A GFCI. You'll need to handle-tie the AFCI breakers if they aren't already. No promises that this is code-legal or that your local inspector will approve.
Simply use a 2-pole GFCI deadfront. Done.
What are you talking about Harper? There's no such thing.
Yes there is. Search "spa panel with 2-pole GFCI".
It's just a 2-space nano-service-panel with a 2-pole GFCI breaker in it. You can buy it pre-built, or assemble it from a GFCI breaker and a 2-space subpanel. The ampacity of the GFCI breaker does not matter.
And this can go right next to the service panel where you've been trying to install the two 1-pole dead fronts.
"That was easy"