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I am planning to add a Reliance 31406 CRK transfer switch using a bonded neutral generator. I can undo the generator bonding if needed. I have a main panel and a sub panel. One of the switches I want to transfer is on the sub panel and one of the switches is on the main panel. I am stuck on where to connect the neutral and ground wires coming out of the transfer switch. I have easy access to the sub panel and can connect there (as shown in the attacked drawing) but don't know if that is appropriate.

schematic

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  • Welcome to Home Improvement. It looks like your drawing was indeed attacked! It never made it to your post. Please edit to include that (and maybe a picture or two of the inside of the panel you're connecting to). Once you've done that, take the tour to familiarize yourself with the place.
    – FreeMan
    Jul 28, 2020 at 22:52
  • Please consider other options than that type of transfer switch. Salesmen like them because they can sell them without having to ask any questions about your panel, but they are rather sub-optimal for a bunch of reasons. Can you tell us the make/model of your main panel? We may be able to find a much more robust and higher quality (and also much cheaper) way to do that thing. Jul 29, 2020 at 0:15
  • Can you post photos of your main and subpanels please? Also, is there more space by your existing panels for something panel-sized? Jul 29, 2020 at 3:13

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Nope. This question comes up a lot on here, and you can't do it because it creates a paralleling problem with the neutrals.

These Reliance switches are designed for one thing: to provide a generator salesman a switch to offer to anyone without having to understand or investigate their panel. But they aren't well made, and they have a lot of limitations -- GFCI/AFCI support is a serious problem. And because of how they mishandle neutrals, supporting 2 separate panels is simply out of the question.

Your only Reliance-side option is to move the circuit in question so it's in the same panel with all the other circuits.

The better way to do it is to do what the generator salesman was trying to avoid: Evaluate your main panel for the feasibility of fitting a Generator Interlock. That lets you feed the entire main service panel (and subpanel too!) from the generator; on the proviso that you limit appliance use (or turn some off) to keep current draw within the generator's range. That will neatly moot your entire problem.

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