2022 Build - 2 main disconnects

[rmeier2 (Robert Meier)]

@mparks3

We are still on the 17 NEC so I haven’t looked at the 2020. Question. Two family. So, I could put 2 emergency disconnects outside, go under the slab to each main panel and run then in 3-wire. That didn’t change? Sounds like is just an inline switch to me.

Yes you can think of it as an inline switch and run only a 3-wire.

@ruecker

Robert, I think I have asked you this before but can’t seem to find the post. When there is an exterior disconnect marked as the emergency disconnect, does that mean everything after is a sub-panel?

I seem to remember you saying that the emergency disconnect may not always be considered the “first point of disconnect” in some situations, as it applies to how to treat the downstream panels.

So you have two options, one is just put a switch outside and wire the interior panel like a normal service with the service disconnect, main bonding jumper and GEC(s) terminating there. Or you can make the outside disconnect the service disconnect and wire the interior panel as a sub-panel. With the first option you would only need 3-wires between the EM disconnect and the service just like in the photo in the OP. Regardless of which method you choose you need to follow the labeling requirements in 230.85.